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109-605: HM Prison Aberdeen (formerly known as Craiginches ) was a medium-security prison, located in the city of Aberdeen , Scotland. The prison was managed by the Scottish Prison Service . Known as one of the most overcrowded prisons in Scotland, it had a design capacity of 155 and was contracted to hold up to 230 prisoners. However, on the first day of an inspection in January 2009 it held 264 prisoners. In 2014, it

218-517: A needle exchange programme. In August 2007 Aberdeen Prison was chosen to pilot a new initiative called the Substance Related Offending Behaviour Program (SROBP) piloted by Officers Graeme Robson and Allan Dewar which looked at prisoners finding the relationship between their substance use and their offending behaviour. This programme has been very successful in reducing rates of recidivism. Aberdeen Prison

327-563: A basaltic magma to a granitic magma, but the quantities produced are small. For example, granitic rock makes up just 4% of the exposures in the South Sandwich Islands . In continental arc settings, granitic rocks are the most common plutonic rocks, and batholiths composed of these rock types extend the entire length of the arc. There are no indication of magma chambers where basaltic magmas differentiate into granites, or of cumulates produced by mafic crystals settling out of

436-520: A diapir it would expend far too much energy in heating wall rocks, thus cooling and solidifying before reaching higher levels within the crust. Fracture propagation is the mechanism preferred by many geologists as it largely eliminates the major problems of moving a huge mass of magma through cold brittle crust. Magma rises instead in small channels along self-propagating dykes which form along new or pre-existing fracture or fault systems and networks of active shear zones. As these narrow conduits open,

545-610: A granite that is derived from partial melting of metasedimentary rocks may have more alkali feldspar, whereas a granite derived from partial melting of metaigneous rocks may be richer in plagioclase. It is on this basis that the modern "alphabet" classification schemes are based. The letter-based Chappell & White classification system was proposed initially to divide granites into I-type (igneous source) granite and S-type (sedimentary sources). Both types are produced by partial melting of crustal rocks, either metaigneous rocks or metasedimentary rocks. I-type granites are characterized by

654-565: A high content of sodium and calcium, and by a strontium isotope ratio, Sr/ Sr, of less than 0.708. Sr is produced by radioactive decay of Rb, and since rubidium is concentrated in the crust relative to the mantle, a low ratio suggests origin in the mantle. The elevated sodium and calcium favor crystallization of hornblende rather than biotite. I-type granites are known for their porphyry copper deposits. I-type granites are orogenic (associated with mountain building) and usually metaluminous. S-type granites are sodium-poor and aluminum-rich. As

763-455: A leading business hub and one of eight 'super cities' spearheading the UK's economy, marking it as the only city in Scotland so designated. In 2018, Aberdeen was found to be the best city in the UK to start a business in a study released by card payment firm Paymentsense. The Aberdeen area has seen human settlement for at least 8,000 years. The city began as two separate burghs : Old Aberdeen at

872-745: A memorial to the consecration of the first bishop of the Episcopal Church in the United States of America , which took place nearby. In 1804, St Peter's Church , the first permanent Roman Catholic church in the city after the Reformation was built. Numerous other Protestant denominations have a presence in Aberdeen. The Salvation Army citadel on the Castlegate dominates the view of the east end of Union Street. In addition, there

981-472: A mixture of 127 Incendiary, High Explosive and Cluster bombs were dropped on the city in one night. Two books written in 2018 and 2022 using bombing records held in London identified that unexploded bombs from the 1943 raid were found in the 1950s and 1980s making the bombs dropped 129 in total. Damage from the raid can still be seen in some parts of Aberdeen. The name given to Aberdeen translates as 'mouth of

1090-824: A much higher proportion of clay with the Cecil soil series a prime example of the consequent Ultisol great soil group. Granite is a natural source of radiation , like most natural stones. Potassium-40 is a radioactive isotope of weak emission, and a constituent of alkali feldspar , which in turn is a common component of granitic rocks, more abundant in alkali feldspar granite and syenites . Some granites contain around 10 to 20 parts per million (ppm) of uranium . By contrast, more mafic rocks, such as tonalite, gabbro and diorite , have 1 to 5 ppm uranium, and limestones and sedimentary rocks usually have equally low amounts. Many large granite plutons are sources for palaeochannel -hosted or roll front uranium ore deposits , where

1199-512: A new February high-temperature station record on 28 February 2012 of 17.2 °C (63.0 °F), and a new March high temperature record of 21.6 °C (70.9 °F) on 25 March 2012. The average temperature of the sea ranges from 6.6 °C (43.9 °F) in March to 13.8 °C (56.8 °F) in August. The Aberdeen locality population estimate is 198,590 (mid-2020 est.). For

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1308-711: A new Town Hall was built and the first social services appeared with the Aberdeen Infirmary at Woolmanhill in 1739 and the Aberdeen Lunatic Asylum in 1800. The expensive infrastructure works led to the city becoming bankrupt in 1817 during the Post-Napoleonic depression , an economic downturn immediately after the Napoleonic Wars ; but the city's prosperity later recovered. The increasing economic importance of Aberdeen and

1417-536: A peculiar mineralogy and geochemistry, with particularly high silicon and potassium at the expense of calcium and magnesium and a high content of high field strength cations (cations with a small radius and high electrical charge, such as zirconium , niobium , tantalum , and rare earth elements .) They are not orogenic, forming instead over hot spots and continental rifting, and are metaluminous to mildly peralkaline and iron-rich. These granites are produced by partial melting of refractory lithology such as granulites in

1526-568: A range of hills, formed by the metamorphic aureole or hornfels . Granite often occurs as relatively small, less than 100 km stock masses ( stocks ) and in batholiths that are often associated with orogenic mountain ranges. Small dikes of granitic composition called aplites are often associated with the margins of granitic intrusions . In some locations, very coarse-grained pegmatite masses occur with granite. Granite forms from silica-rich ( felsic ) magmas. Felsic magmas are thought to form by addition of heat or water vapor to rock of

1635-415: A result, they contain micas such as biotite and muscovite instead of hornblende. Their strontium isotope ratio is typically greater than 0.708, suggesting a crustal origin. They also commonly contain xenoliths of metamorphosed sedimentary rock, and host tin ores. Their magmas are water-rich, and they readily solidify as the water outgasses from the magma at lower pressure, so they less commonly make it to

1744-466: Is grus , which is often made up of coarse-grained fragments of disintegrated granite. Climatic variations also influence the weathering rate of granites. For about two thousand years, the relief engravings on Cleopatra's Needle obelisk had survived the arid conditions of its origin before its transfer to London. Within two hundred years, the red granite has drastically deteriorated in the damp and polluted air there. Soil development on granite reflects

1853-545: Is microgranite . The extrusive igneous rock equivalent of granite is rhyolite . Granitic rock is widely distributed throughout the continental crust . Much of it was intruded during the Precambrian age; it is the most abundant basement rock that underlies the relatively thin sedimentary veneer of the continents. Outcrops of granite tend to form tors , domes or bornhardts , and rounded massifs . Granites sometimes occur in circular depressions surrounded by

1962-517: Is 3–6·10 Pa·s. The melting temperature of dry granite at ambient pressure is 1215–1260 °C (2219–2300 °F); it is strongly reduced in the presence of water, down to 650 °C at a few hundred megapascals of pressure. Granite has poor primary permeability overall, but strong secondary permeability through cracks and fractures if they are present. A worldwide average of the chemical composition of granite, by weight percent, based on 2485 analyses: The medium-grained equivalent of granite

2071-601: Is a Unitarian church, established in 1833 and located in Skene Terrace. Christadelphians have been present in Aberdeen since at least 1844. Over the years, they have rented space to meet at a number of locations and currently meet in the Inchgarth Community Centre in Garthdee. There is also a Quaker meetinghouse on Crown Street, the only purpose built Friends meeting house in Scotland that

2180-403: Is a higher percentage than both Glasgow and Edinburgh . In the household, there were 97,013 individual dwellings recorded in the city, of which 61% were privately owned, 9% privately rented and 23% rented from the council. The most popular type of dwellings are apartments which comprise 49% of residences followed by semi-detached at just below 22%. The median income of a household in the city

2289-536: Is also a Thai Buddhist temple located in the Hazelhead area of the city. There are no formal Hindu buildings, although there is a fortnightly Hindu religious gathering on the first and third Sunday afternoons at Queens Cross Parish church hall. The University of Aberdeen has a small Baháʼí society. Traditionally, Aberdeen was home to fishing, textile mills, shipbuilding and paper-making. These industries have been largely replaced. High technology developments in

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2398-410: Is an excess of aluminum beyond what can be taken up in feldspars (Al 2 O 3 > CaO + K 2 O + Na 2 O) are described as peraluminous , and they contain aluminum-rich minerals such as muscovite . The average density of granite is between 2.65 and 2.75 g/cm (165 and 172 lb/cu ft), its compressive strength usually lies above 200 MPa (29,000 psi), and its viscosity near STP

2507-637: Is believed to have a mass of around 81 tonnes. It was the tallest temple in south India. Imperial Roman granite was quarried mainly in Egypt, and also in Turkey, and on the islands of Elba and Giglio . Granite became "an integral part of the Roman language of monumental architecture". The quarrying ceased around the third century AD. Beginning in Late Antiquity the granite was reused, which since at least

2616-434: Is called a binary or two-mica granite. Two-mica granites are typically high in potassium and low in plagioclase, and are usually S-type granites or A-type granites, as described below . Another aspect of granite classification is the ratios of metals that potentially form feldspars. Most granites have a composition such that almost all their aluminum and alkali metals (sodium and potassium) are combined as feldspar. This

2725-502: Is from Aberdeen city. Henry John Burnett , the last man to be executed in Scotland, was hanged inside the prison on 15 August 1963. Aberdeen Aberdeen ( / ˌ æ b ər ˈ d iː n / AB -ər- DEEN ; locally [ˌeːbərˈdin] or [ˈeːbərdin] ; Scottish Gaelic : Obar Dheathain [ˈopəɾ ˈʝɛ.ɪɲ] ) is a city in North East Scotland , and

2834-399: Is further north than almost all of Denmark and plenty of southern Sweden, being just south of Gothenburg in terms of latitude. Aberdeen features an oceanic climate ( Köppen Cfb ), with far milder winter temperatures than one might expect for its northern location. However, statistically speaking, it is still the coldest city in the UK. During the winter, especially throughout December,

2943-537: Is interest in the development of new energy sources, and technology transfer from oil into renewable energy and other industries is underway. The "Energetica" initiative led by Scottish Enterprise has been designed to accelerate this process. Aberdeen has become a major world centre for undersea petroleum technology. Granite Granite is typical of a larger family of granitic rocks , or granitoids , that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by

3052-433: Is limited by the amount of thermal energy available, which must be replenished by crystallization of higher-melting minerals in the magma. Thus, the magma is melting crustal rock at its roof while simultaneously crystallizing at its base. This results in steady contamination with crustal material as the magma rises. This may not be evident in the major and minor element chemistry, since the minerals most likely to crystallize at

3161-404: Is permeated by sheets and channels of light granitic rock (the leucosome ). The leucosome is interpreted as partial melt of a parent rock that has begun to separate from the remaining solid residue (the melanosome). If enough partial melt is produced, it will separate from the source rock, become more highly evolved through fractional crystallization during its ascent toward the surface, and become

3270-454: Is relieved when overlying material is removed by erosion or other processes. Chemical weathering of granite occurs when dilute carbonic acid , and other acids present in rain and soil waters, alter feldspar in a process called hydrolysis . As demonstrated in the following reaction, this causes potassium feldspar to form kaolinite , with potassium ions, bicarbonate, and silica in solution as byproducts. An end product of granite weathering

3379-678: Is represented in the Parliament of the United Kingdom by two constituencies , Aberdeen North and Aberdeen South , which are wholly within the Aberdeen City council area. In the Scottish Parliament , the city is represented by three constituencies with different boundaries: Aberdeen Central and Aberdeen Donside are wholly within the Aberdeen City council area. Aberdeen South and North Kincardine includes

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3488-411: Is some concern that some granite sold as countertops or building material may be hazardous to health. Dan Steck of St. Johns University has stated that approximately 5% of all granite is of concern, with the caveat that only a tiny percentage of the tens of thousands of granite slab types have been tested. Resources from national geological survey organizations are accessible online to assist in assessing

3597-562: Is still in use today. In addition, there are a number of Baptist congregations in the city, and Evangelical congregations have been appearing in significant numbers since the late 2000s. The city also has two meeting houses of the Church of Jesus Christ of Latter-day Saints (LDS Church). There are also four mosques in Aberdeen which serve the Islamic community in the city. There is an Orthodox Jewish Synagogue established in 1945. There

3706-479: Is that magma will rise through the crust as a single mass through buoyancy . As it rises, it heats the wall rocks , causing them to behave as a power-law fluid and thus flow around the intrusion allowing it to pass without major heat loss. This is entirely feasible in the warm, ductile lower crust where rocks are easily deformed, but runs into problems in the upper crust which is far colder and more brittle. Rocks there do not deform so easily: for magma to rise as

3815-441: Is the third most populous Scottish city . Historically, Aberdeen was within the historic county of Aberdeenshire , but is now separate from the council area of Aberdeenshire . Aberdeen is one of Scotland's 32 local government council areas (as Aberdeen City ), and has a population of 198,590 (mid-2020 est.) for the urban area, making it the United Kingdom's 39th most populous built-up area , and 224,190 (2022) for

3924-410: Is the case when K 2 O + Na 2 O + CaO > Al 2 O 3 > K 2 O + Na 2 O. Such granites are described as normal or metaluminous . Granites in which there is not enough aluminum to combine with all the alkali oxides as feldspar (Al 2 O 3 < K 2 O + Na 2 O) are described as peralkaline , and they contain unusual sodium amphiboles such as riebeckite . Granites in which there

4033-459: Is typically orthoclase or microcline and is often perthitic . The plagioclase is typically sodium-rich oligoclase . Phenocrysts are usually alkali feldspar. Granitic rocks are classified according to the QAPF diagram for coarse grained plutonic rocks and are named according to the percentage of quartz , alkali feldspar ( orthoclase , sanidine , or microcline ) and plagioclase feldspar on

4142-428: Is uncommon, is classified simply as quartz-rich granitoid or, if composed almost entirely of quartz, as quartzolite . True granites are further classified by the percentage of their total feldspar that is alkali feldspar. Granites whose feldspar is 65% to 90% alkali feldspar are syenogranites , while the feldspar in monzogranite is 35% to 65% alkali feldspar. A granite containing both muscovite and biotite micas

4251-411: Is £16,813 (the mean income is £20,292) (2005) which places approximately 18% households in the city below the poverty line (defined as 60% of the mean income). Conversely, an Aberdeen postcode has the second highest number of millionaires of any postcode in the UK. The proportion of people residing in Aberdeen born outside the UK was 21.1% in 2022, compared with 15.9% in 2011 and 6.3% in 2001. Below are

4360-590: The oil industry and Aberdeen's seaport. Aberdeen Heliport is one of the busiest commercial heliports in the world, and the seaport is the largest in the north-east part of Scotland. A university town , the city is known for the University of Aberdeen , founded in 1495 as the fifth oldest university in the English-speaking world and located in Old Aberdeen . In 2012, HSBC named Aberdeen as

4469-477: The 20th century. Catches have fallen because of overfishing and the use of the harbour by oil support vessels, and so although still an important fishing port it is now eclipsed by the more northerly ports of Peterhead and Fraserburgh . The Fisheries Research Services are headquartered in Aberdeen, and there is a marine research laboratory there. Aberdeen is well regarded for the agricultural and soil research carried out at The James Hutton Institute (formerly

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4578-571: The A-Q-P half of the diagram. True granite (according to modern petrologic convention) contains between 20% and 60% quartz by volume, with 35% to 90% of the total feldspar consisting of alkali feldspar . Granitic rocks poorer in quartz are classified as syenites or monzonites , while granitic rocks dominated by plagioclase are classified as granodiorites or tonalites . Granitic rocks with over 90% alkali feldspar are classified as alkali feldspar granites . Granitic rock with more than 60% quartz, which

4687-749: The East and West churches. At that time, the city also was home to houses of the Carmelites (Whitefriars) and Franciscans (Greyfriars). The latter survives in modified form as the chapel of Marischal College. St Machar's Cathedral was built twenty years after David I (1124–1153) transferred the pre-Reformation diocese from Mortlach in Banffshire to Old Aberdeen in 1137. Except the episcopate of William Elphinstone (1484–1511), building progressed slowly. Gavin Dunbar , who followed him in 1518, completed

4796-517: The English-held Aberdeen Castle before destroying it in 1308. It is still widely present in the city, throughout street names, business names and the city's Bon Accord shopping mall. The shield in the coat of arms is supported by two leopards . A local magazine is called the "Leopard" and, when Union Bridge was widened in the 20th century, small statues of the creature in a sitting position were cast and placed on top of

4905-615: The European Union safety standards (section 4.1.1.1 of the National Health and Engineering study) and radon emission levels well below the average outdoor radon concentrations in the US. Granite and related marble industries are considered one of the oldest industries in the world, existing as far back as Ancient Egypt . Major modern exporters of granite include China, India, Italy, Brazil, Canada, Germany, Sweden, Spain and

5014-648: The Macaulay Land Use Research Institute), which has close links to the city's two universities. The Rowett Research Institute is a world-renowned research centre for studies into food and nutrition located in Aberdeen. It has produced three Nobel laureates and there is a high concentration of life scientists working in the city. As oil reserves in the North Sea decrease, there is an effort to rebrand Aberdeen as "Energy Capital of Europe" rather than "Oil Capital of Europe", and there

5123-639: The Mohs hardness scale) , and tough. These properties have made granite a widespread construction stone throughout human history. The word "granite" comes from the Latin granum , a grain, in reference to the coarse-grained structure of such a completely crystalline rock. Granitic rocks mainly consist of feldspar , quartz , mica , and amphibole minerals , which form an interlocking, somewhat equigranular matrix of feldspar and quartz with scattered darker biotite mica and amphibole (often hornblende ) peppering

5232-667: The North Kincardine ward of Aberdeenshire Council . A further seven MSPs are elected as part of the North East Scotland electoral region. In the European Parliament the city was represented by six MEPs as part of the all-inclusive Scotland constituency. The arms and banner of the city show three silver towers on red. This motif dates from at least the time of Robert the Bruce and represents

5341-448: The United States. The Red Pyramid of Egypt ( c.  2590 BC ), named for the light crimson hue of its exposed limestone surfaces, is the third largest of Egyptian pyramids . Pyramid of Menkaure , likely dating 2510 BC, was constructed of limestone and granite blocks. The Great Pyramid of Giza (c. 2580 BC ) contains a huge granite sarcophagus fashioned of "Red Aswan Granite". The mostly ruined Black Pyramid dating from

5450-575: The adjoining Marischal College . The civic head and chair of the council is the Lord Provost . The council area is also divided into 30 community council areas , 29 of which had community councils operating as at August 2024. The first burgh of Aberdeen, covering just the New Aberdeen area near the mouth of the Dee, was created by David I (reigned 1124–1153). Neighbouring Old Aberdeen to

5559-419: The base of the chamber are the same ones that would crystallize anyway, but crustal assimilation is detectable in isotope ratios. Heat loss to the country rock means that ascent by assimilation is limited to distance similar to the height of the magma chamber. Physical weathering occurs on a large scale in the form of exfoliation joints , which are the result of granite's expanding and fracturing as pressure

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5668-553: The basis for the city's Common Good Fund which still benefits Aberdonians. During the Wars of Scottish Independence , Aberdeen was under English rule, so Robert the Bruce laid siege to Aberdeen Castle before destroying it in 1308, followed by executing the English garrison. The city was burned by Edward III of England in 1336, but was rebuilt and extended. The city was strongly fortified to prevent attacks by neighbouring lords, but

5777-418: The big difference in rheology between mafic and felsic magmas makes this process problematic in nature. Granitization is an old, and largely discounted, hypothesis that granite is formed in place through extreme metasomatism . The idea behind granitization was that fluids would supposedly bring in elements such as potassium, and remove others, such as calcium, to transform a metamorphic rock into granite. This

5886-448: The buildings that stood on the three hills of medieval Aberdeen: Aberdeen Castle on Castle Hill (today's Castlegate ); the city gate on Port Hill; and a church on St Catherine's Hill (now levelled). "Bon Accord" is the motto of the city and is French for "Good Agreement". Legend tells that its use dates from a password used by Robert the Bruce during the 14th century Wars of Scottish Independence , when he and his men laid siege to

5995-604: The city spread beyond the (inferred) limits of the outlier onto the surrounding metamorphic/ igneous complexes formed during the Dalradian period (approximately 480–600 million years ago) with sporadic areas of igneous Diorite granites to be found, such as that at the Rubislaw quarry which was used to build much of the Victorian parts of the city. The city extends to 186 km (72 sq mi), and includes

6104-526: The city was plundered by both sides. In 1644, it was taken and ransacked by Royalist troops after the Battle of Aberdeen and two years later it was stormed by a Royalist force under the command of the George Gordon, 2nd Marquis of Huntly . An outbreak of bubonic plague over 1687 and 1688 killed 8.5% of the population, adding to the economic and demographic damage caused by war. In the 18th century,

6213-646: The city, with paper having been first made there in 1694. Paper-making has reduced in importance since the closures of Donside Paper Mill in 2001 and the Davidson Mill in 2005 leaving the Stoneywood Paper Mill with a workforce of approximately 500. Textile production ended in 2004 when Richards of Aberdeen closed. Grey granite was quarried at Rubislaw quarry for more than 300 years, and used for paving setts, kerb and building stones, and monumental and other ornamental pieces. Aberdeen granite

6322-548: The composition of the local council, and the affairs of the town. The Burgesses of the Guild were an integral part of the council for more than 700 years and played a considerable role in the growth and development of Aberdeen. In 1319, the Great Charter of Robert the Bruce transformed Aberdeen into a property-owning and financially independent community. Granted with it was the nearby Forest of Stocket, whose income formed

6431-464: The counties of Aberdeenshire and Kincardineshire . Aberdeen was made a county of itself in 1899. In 1975 the burgh was replaced by the larger City of Aberdeen district within the Grampian region. Further local government reforms in 1996 replaced the districts and regions created in 1975 with council areas; the pre-1996 City of Aberdeen district became the Aberdeen City council area. Aberdeen

6540-609: The development of the shipbuilding and fishing industries led to the construction of the present harbour including Victoria Dock and the South Breakwater, and the extension of the North Pier. Gas street lighting arrived in 1824 and an enhanced water supply appeared in 1830 when water was pumped from the Dee to a reservoir in Union Place. An underground sewer system replaced open sewers in 1865. The city absorbed

6649-519: The discovery of North Sea oil in 1969, Aberdeen has been known as the offshore oil capital of Europe. Based upon the discovery of prehistoric villages around the mouths of the rivers Dee and Don , the area around Aberdeen has been thought to have been settled for at least 6,000 years. Aberdeen received royal burgh status from David I of Scotland (1124–1153), which transformed the city economically. The traditional industries of fishing, paper-making, shipbuilding, and textiles have been overtaken by

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6758-404: The division between S-type (produced by underplating) and I-type (produced by injection and differentiation) granites, discussed below. The composition and origin of any magma that differentiates into granite leave certain petrological evidence as to what the granite's parental rock was. The final texture and composition of a granite are generally distinctive as to its parental rock. For instance,

6867-473: The early 16th century became known as spolia . Through the process of case-hardening , granite becomes harder with age. The technology required to make tempered metal chisels was largely forgotten during the Middle Ages. As a result, Medieval stoneworkers were forced to use saws or emery to shorten ancient columns or hack them into discs. Giorgio Vasari noted in the 16th century that granite in quarries

6976-402: The electronics design and development industry, research in agriculture and fishing and the oil industry , which have been largely responsible for Aberdeen's economic growth, are now major parts of Aberdeen's economy. Until the 1970s, most of Aberdeen's leading industries dated from the 18th century; mainly these were textiles, foundry work, shipbuilding and paper-making, the oldest industry in

7085-439: The entire night. Temperatures at this time of year hover around 17.0 °C (62.6 °F) during the day in most of the urban area, though nearer 16.0 °C (60.8 °F) directly on the coast, and around 18.0 to 19.0 °C (64.4 to 66.2 °F) in the westernmost suburbs. Two weather stations collect climate data for the area, Aberdeen/Dyce Airport , and Craibstone. Both are about 4 + 1 ⁄ 2 miles (7 km) to

7194-663: The fifteen largest overseas-born groups in Aberdeen according to the 2022 census, alongside the two previous censuses. Christianity is the main religion practised in the city. Aberdeen's largest denominations are the Church of Scotland (through the Presbytery of Aberdeen ) and the Roman Catholic Church , both with numerous churches across the city, with the Scottish Episcopal Church having

7303-579: The first magma to enter solidifies and provides a form of insulation for later magma. These mechanisms can operate in tandem. For example, diapirs may continue to rise through the brittle upper crust through stoping , where the granite cracks the roof rocks, removing blocks of the overlying crust which then sink to the bottom of the diapir while the magma rises to take their place. This can occur as piecemeal stopping (stoping of small blocks of chamber roof), as cauldron subsidence (collapse of large blocks of chamber roof), or as roof foundering (complete collapse of

7412-569: The first settlement of Aberdeen; this literally means "the mouth of the Don". The Celtic word aber means "river mouth", as in modern Welsh ( Aberystwyth , Aberdare , Aberbeeg etc.). The Scottish Gaelic name is Obar Dheathain (variation: Obairreadhain ; * obar presumably being a loan from the earlier Pictish; the Gaelic term is inbhir ), and in Latin , the Romans referred to

7521-456: The former burghs of Old Aberdeen, New Aberdeen, Woodside and the Torry area to the south of River Dee . In 2022, this gave the city a population density of 1,208 inhabitants per square kilometre (3,130/sq mi). The city is built on many hills, with the original beginnings of the city growing from Castle Hill, St. Catherine's Hill and Windmill Hill. When compared to mainland Europe, Aberdeen

7630-604: The gates were removed by 1770. Aberdeen's medieval council registers survive from 1398 onwards and are exceptional for their quantity and continuity among surviving Scottish burgh records. The earliest eight volumes, from 1398 to 1511, have been included in the UNESCO UK Memory of the World Register , and have been edited in a digital edition. During the Wars of the Three Kingdoms of 1644 to 1647

7739-713: The grotto is a highly regarded piece of Buddhist art , and along with the temple complex to which it belongs, Seokguram was added to the UNESCO World Heritage List in 1995. Rajaraja Chola I of the Chola Dynasty in South India built the world's first temple entirely of granite in the 11th century AD in Tanjore , India . The Brihadeeswarar Temple dedicated to Lord Shiva was built in 1010. The massive Gopuram (ornate, upper section of shrine)

7848-423: The length of the day is very short, averaging 6 hours and 41 minutes between sunrise and sunset at the winter solstice. As winter progresses, the length of the day grows fairly quickly, to 8 hours and 20 minutes by the end of January. Around summer solstice, the days will be around 18 hours long, having 17 hours and 55 minutes between sunrise and sunset. During this time of the year marginal nautical twilight lasts

7957-570: The lighter color minerals. Occasionally some individual crystals ( phenocrysts ) are larger than the groundmass , in which case the texture is known as porphyritic . A granitic rock with a porphyritic texture is known as a granite porphyry . Granitoid is a general, descriptive field term for lighter-colored, coarse-grained igneous rocks. Petrographic examination is required for identification of specific types of granitoids. Granites can be predominantly white, pink, or gray in color, depending on their mineralogy . The alkali feldspar in granites

8066-474: The lower crust , rather than by decompression of mantle rock, as is the case with basaltic magmas. It has also been suggested that some granites found at convergent boundaries between tectonic plates , where oceanic crust subducts below continental crust, were formed from sediments subducted with the oceanic plate. The melted sediments would have produced magma intermediate in its silica content, which became further enriched in silica as it rose through

8175-729: The lower continental crust at high thermal gradients. This leads to significant extraction of hydrous felsic melts from granulite-facies resitites. A-type granites occur in the Koettlitz Glacier Alkaline Province in the Royal Society Range, Antarctica. The rhyolites of the Yellowstone Caldera are examples of volcanic equivalents of A-type granite. M-type granite was later proposed to cover those granites that were clearly sourced from crystallized mafic magmas, generally sourced from

8284-435: The magma is inevitable once enough magma has accumulated. However, the question of precisely how such large quantities of magma are able to shove aside country rock to make room for themselves (the room problem ) is still a matter of research. Two main mechanisms are thought to be important: Of these two mechanisms, Stokes diapirism has been favoured for many years in the absence of a reasonable alternative. The basic idea

8393-426: The magma. Other processes must produce these great volumes of felsic magma. One such process is injection of basaltic magma into the lower crust, followed by differentiation, which leaves any cumulates in the mantle. Another is heating of the lower crust by underplating basaltic magma, which produces felsic magma directly from crustal rock. The two processes produce different kinds of granites, which may be reflected in

8502-408: The magmatic parent of granitic rock. The residue of the source rock becomes a granulite . The partial melting of solid rocks requires high temperatures and the addition of water or other volatiles which lower the solidus temperature (temperature at which partial melting commences) of these rocks. It was long debated whether crustal thickening in orogens (mountain belts along convergent boundaries )

8611-405: The mantle. Although the fractional crystallisation of basaltic melts can yield small amounts of granites, which are sometimes found in island arcs, such granites must occur together with large amounts of basaltic rocks. H-type granites were suggested for hybrid granites, which were hypothesized to form by mixing between mafic and felsic from different sources, such as M-type and S-type. However,

8720-531: The mouth of the river Don ; and New Aberdeen, a fishing and trading settlement, where the Denburn waterway entered the river Dee estuary. The earliest charter was granted by William the Lion in 1179 and confirmed the corporate rights granted by David I . In 1214, Aberdeen Burgesses were granted a Royal Charter by Alexander II of Scotland giving them the sole right to form a Guild. This body exercised power in

8829-505: The national average of 19.2%. According to the 2011 census Aberdeen is 91.9% white, ethnically, 24.7% were born outside Scotland, higher than the national average of 16%. Of this population, 7.6% were born in other parts of the UK. 8.2% of Aberdonians stated to be from an ethnic minority (non-white) in the 2011 census, with 9,519 (4.3%) being Asian, with 3,385 (1.5%) coming from India and 2,187 (1.0%) being Chinese . The city has around 5,610 (2.6%) residents of African or Caribbean origin, which

8938-561: The neighbouring burghs of Old Aberdeen and Woodside plus the Torry area on the south bank of the Dee in 1891. Over the course of World War II Aberdeen was attacked 32 times by the German Luftwaffe . One of the most devastating attacks was on Wednesday 21 April 1943 when 29 Luftwaffe Dornier 217s flying from Stavanger , Norway attacked the city between the hours of 22:17 and 23:04. A total of 98 civilians and 27 servicemen were killed, along with 12,000 houses damaged, after

9047-460: The neighbouring burghs of Old Aberdeen and Woodside, plus the Torry area on the south bank of the Dee. The act of parliament which expanded the burgh also confirmed that Aberdeen was entitled to be called a city; it had commonly been described as a city prior to that, but (like most Scottish cities) without official recognition. Following the absorption of Torry in 1891, the city boundaries straddled

9156-486: The north was subsequently made a separate burgh in 1489. The burgh of Aberdeen was governed by a corporation, also known as the town council. As Aberdeen grew, the council's powers were inadequate to cater for the needs of the growing urban area. A separate police commission was established in 1795 with powers to levy taxes and provide infrastructure ('police' in this context being its older meaning of civic government rather than law enforcement). The first police commission

9265-426: The northwest of the city centre, and given that they are in close proximity to each other, exhibit very similar climatic regimes. Dyce tends to have marginally warmer daytime temperatures year-round owing to its slightly lower elevation, though it is more susceptible to harsh frosts. The coldest temperature to occur in recent years was −16.8 °C (1.8 °F) during December 2010, while the following winter, Dyce set

9374-441: The overlying crust. Early fractional crystallisation serves to reduce a melt in magnesium and chromium, and enrich the melt in iron, sodium, potassium, aluminum, and silicon. Further fractionation reduces the content of iron, calcium, and titanium. This is reflected in the high content of alkali feldspar and quartz in granite. The presence of granitic rock in island arcs shows that fractional crystallization alone can convert

9483-522: The railing posts (known locally as Kelly's Cats). The city's toast is "Happy to meet, sorry to part, happy to meet again". Being situated between two river mouths, the city has little natural exposure of bedrock. The small amount of geophysics done, and occasional building-related exposures, combined with small exposures in the banks of the River Don, suggest that it is actually sited on an inlier of Devonian "Old Red" sandstones and silts. The outskirts of

9592-736: The reign of Amenemhat III once had a polished granite pyramidion or capstone, which is now on display in the main hall of the Egyptian Museum in Cairo (see Dahshur ). Other uses in Ancient Egypt include columns , door lintels , sills , jambs , and wall and floor veneer. How the Egyptians worked the solid granite is still a matter of debate. Tool marks described by the Egyptologist Anna Serotta indicate

9701-420: The relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF classification ), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (known as leucogranites ) contain almost no dark minerals. Granite is nearly always massive (lacking any internal structures), hard (falling between 6 and 7 on

9810-564: The risk factors in granite country and design rules relating, in particular, to preventing accumulation of radon gas in enclosed basements and dwellings. A study of granite countertops was done (initiated and paid for by the Marble Institute of America) in November 2008 by National Health and Engineering Inc. of USA. In this test, all of the 39 full-size granite slabs that were measured for the study showed radiation levels well below

9919-527: The river Don', and is recorded as Aberdon in 1172 and Aberden in c.  1180 . The first element of the name is the Pictish word aber 'river mouth'. The second element is from the Celtic river goddess Devona . Aberdeen is usually described as within the historical Pictish territory and became Gaelic-speaking at some time in the medieval period. Old Aberdeen is the approximate location of Aberdon,

10028-446: The river as Devana . Medieval (or Ecclesiastical ) Latin has it as Aberdonia . The local Doric pronunciation, [ˌeːbərˈdin] or [ˈeːbərdin] (with a long ay sound), is frequently rendered Aiberdeen or Aiberdein . Aberdeen City is one of 32 council areas of Scotland , administered by Aberdeen City Council . The council meets at Aberdeen Town House and has its main offices in

10137-418: The rock's high quartz content and dearth of available bases, with the base-poor status predisposing the soil to acidification and podzolization in cool humid climates as the weather-resistant quartz yields much sand. Feldspars also weather slowly in cool climes, allowing sand to dominate the fine-earth fraction. In warm humid regions, the weathering of feldspar as described above is accelerated so as to allow

10246-414: The rocks often bear a close resemblance. Under these conditions, granitic melts can be produced in place through the partial melting of metamorphic rocks by extracting melt-mobile elements such as potassium and silicon into the melts but leaving others such as calcium and iron in granulite residues. This may be the origin of migmatites . A migmatite consists of dark, refractory rock (the melanosome ) that

10355-492: The roof of a shallow magma chamber accompanied by a caldera eruption.) There is evidence for cauldron subsidence at the Mt. Ascutney intrusion in eastern Vermont. Evidence for piecemeal stoping is found in intrusions that are rimmed with igneous breccia containing fragments of country rock. Assimilation is another mechanism of ascent, where the granite melts its way up into the crust and removes overlying material in this way. This

10464-465: The structure by adding the two western spires and the southern transept. It is now a congregation of the Church of Scotland . Aberdeen has two other cathedrals: St. Mary's Cathedral is a Roman Catholic cathedral in Gothic style , erected in 1859. In addition, St. Andrew's Cathedral serves the Scottish Episcopal Church . It was constructed in 1817 as Archibald Simpson 's first commission and contains

10573-435: The surface than magmas of I-type granites, which are thus more common as volcanic rock (rhyolite). They are also orogenic but range from metaluminous to strongly peraluminous. Although both I- and S-type granites are orogenic, I-type granites are more common close to the convergent boundary than S-type. This is attributed to thicker crust further from the boundary, which results in more crustal melting. A-type granites show

10682-590: The third-largest number. The census in 2022 showed that Aberdeen has the highest proportion of non-religious residents of any city in Scotland, with 58% of citizens claiming to have no religion. In the Middle Ages , the Kirk of St Nicholas was the only burgh kirk and one of Scotland's largest parish churches. Like a number of other Scottish kirks, it was subdivided after the Reformation , in this case into

10791-502: The uranium washes into the sediments from the granite uplands and associated, often highly radioactive pegmatites. Cellars and basements built into soils over granite can become a trap for radon gas, which is formed by the decay of uranium. Radon gas poses significant health concerns and is the number two cause of lung cancer in the US behind smoking. Thorium occurs in all granites. Conway granite has been noted for its relatively high thorium concentration of 56±6 ppm. There

10900-617: The use of flint tools on finer work with harder stones, e.g. when producing the hieroglyphic inscriptions. Patrick Hunt has postulated that the Egyptians used emery , which has greater hardness. The Seokguram Grotto in Korea is a Buddhist shrine and part of the Bulguksa temple complex. Completed in 774 AD, it is an artificial grotto constructed entirely of granite. The main Buddha of

11009-425: The wider settlement of Aberdeen including Cove Bay and Dyce , the population estimate is 220,690 (mid-2020 est.). For Aberdeen City council area, the population estimate is 224,190 (2022). In 1396, the population was about 3,000. By 1801, it had become 26,992, then 153,503 in 1901, and finally 182,467 in 1941. The 2011 census showed fewer young people in Aberdeen, with 16.4% under 16, as opposed to

11118-467: The wider council area including outlying localities. The city is 127 mi (204 km) northeast of Edinburgh and 536 mi (863 km) north of London . Aberdeen has a long, sandy coastline and features an oceanic climate , with cool summers and mild, rainy winters. During the mid-18th to mid-20th centuries, Aberdeen's buildings incorporated locally quarried grey granite , which may sparkle like silver because of its high mica content. Since

11227-482: Was Graeme Robson who is now a Residential Compliance Manager. The "Super-Jail" can accommodate approx 500 prisoners and the new prison is known as HMP Grampian. Aberdeen Prison which served predominantly Aberdeen city and its environs has been closed and have been replaced by HMP & YOI Grampian , a prison located in Peterhead which has been described as a "community facing Prison". However 70% of Grampian's populace

11336-469: Was also recognised for its investment in in-house Bereavement Counseling services facilitated by Graeme Robson and Wayne Lawson. On 4 June 2008, it was announced that HMP Aberdeen and HMP Peterhead would be merged into a "Super Prison" and a new state of the art prison built on the Peterhead site. A new tranche of managers were recruited identifying key skills such as prisoner management, problem solving, project management and compliance. Initially identified

11445-512: Was closed in favour of the new HMP Grampian and the site was redeveloped as a housing estate. In its latter years it saw an increase in inmates from outside the Grampian Sheriffdom, mainly from Wolverhampton and London. The diverse population led to many internal feuds and disputes. It ran exceptional drug rehabilitation programmes and was a pioneer for drug projects such as drug use kits etc. The management also wished to pilot

11554-429: Was short-lived, but it was resurrected in 1818 after the town council went bankrupt in 1817. From 1818 until 1871 there was a dual system of local government, with the town council and police commission having different roles in Aberdeen's administration. The police commission was eventually abolished in 1871 and its functions absorbed by the town council. In 1891 the city boundaries were significantly enlarged, absorbing

11663-405: Was sufficient to produce granite melts by radiogenic heating , but recent work suggests that this is not a viable mechanism. In-situ granitization requires heating by the asthenospheric mantle or by underplating with mantle-derived magmas. Granite magmas have a density of 2.4 Mg/m , much less than the 2.8 Mg/m of high-grade metamorphic rock. This gives them tremendous buoyancy, so that ascent of

11772-564: Was supposed to occur across a migrating front. However, experimental work had established by the 1960s that granites were of igneous origin. The mineralogical and chemical features of granite can be explained only by crystal-liquid phase relations, showing that there must have been at least enough melting to mobilize the magma. However, at sufficiently deep crustal levels, the distinction between metamorphism and crustal melting itself becomes vague. Conditions for crystallization of liquid magma are close enough to those of high-grade metamorphism that

11881-460: Was used to build the terraces of the Houses of Parliament and Waterloo Bridge in London. Quarrying finally ceased in 1971. The current owners have begun pumping 40 years of rainwater from the quarry to develop a heritage centre on the site. In-shore fishing was once the predominant industry but was surpassed by deep-sea fisheries, which derived a great impetus from improved technologies throughout

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