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15-413: Buenos Aires Lake may refer to: General Carrera Lake / Buenos Aires Lake, Argentina Buenos Aires Lake (Bolivia) [REDACTED] Topics referred to by the same term This disambiguation page lists articles about distinct geographical locations with the same name. If an internal link led you here, you may wish to change the link to point directly to

30-424: A continental-scale graben formed by SWS-ENE normal faults that have resulted in down-dropping the bottom of the lake to 350 meters (1,150 ft) below mean sea level. Preservation of younger lithostratigraphic units within the graben form reverse stratigraphy with older units exposed at higher topographic elevations to the south. The graben channeled mountain glaciers which formed terminal moraine helping to modify

45-589: A diagram of this, see the link below). This produces anomalous thermal, chemical and physical effects in the mantle that can dramatically change the over-riding plate by interrupting the established tectonic and magmatic regimes. In general, the data used to identify possible slab windows comes from seismic tomography and heat flow studies. As a slab window develops, the mantle in that region becomes increasingly hot and dry. The decrease in hydration causes arc volcanism to diminish or stop entirely, as magma production in subduction zones generally results from hydration of

60-698: A surface of 1,850 km (710 sq mi) of which 970 square kilometres (370 sq mi) are in the Chilean Aysén del General Carlos Ibáñez del Campo Region , and 880 square kilometres (340 sq mi) in the Argentine Santa Cruz Province , making it the biggest lake in Chile, and the fourth largest in Argentina. In its western basin, Lake Gen. Carrera has 586 m (1,923 ft) maximum depth. The lake occupies

75-413: Is a gap that forms in a subducted oceanic plate when a mid-ocean ridge meets with a subduction zone and plate divergence at the ridge and convergence at the subduction zone continue, causing the ridge to be subducted. Formation of a slab window produces an area where the crust of the over-riding plate is lacking a rigid lithospheric mantle component and thus is exposed to hot asthenospheric mantle (for

90-844: The Andes mountain range. The lake drains to the Pacific Ocean on the west through the Baker River . During the last glaciation the lake drained to the Atlantic through Deseado River . The weather in this area of Chile and Argentina is generally cold and humid. But the lake itself has a sunny microclimate , a weather pattern enjoyed by the few settlements along the lake, such as Puerto Guadal , Fachinal , Mallín Grande, Puerto Murta , Puerto Río Tranquilo, Puerto Sánchez , Puerto Ingeniero Ibáñez and Chile Chico in Chile, and Los Antiguos and Perito Moreno in Argentina. The area near

105-545: The North American plate . These effects include distinct fore-arc volcanism and extension in the plate which may be a contributing factor to the formation of the Basin and Range Province . The northward younging of Pemberton Belt volcanism in southwestern British Columbia , Canada, may have been related to a northward moving slab window edge under North America 29 to 6.8 million years ago. In addition to

120-408: The angle the ridge intersects the subduction zone and the dip angle of the down-going plate. Other influential factors include the rates of divergence and subduction as well as heterogeneities found within specific systems. There are two end-member scenarios in terms of the geometry of a slab window: the first is when the subducted ridge is perpendicular to the trench, producing a V-shaped window, and

135-531: The coast of the lake was first inhabited by criollos and European immigrants between 1900 and 1925. In 1971 and 1991, eruptions of the Hudson Volcano severely affected the local economy, especially that of sheep farming. A car ferry operates between Puerto Ingeniero Ibáñez and Chile Chico in the Chilean sector of the lake. The lake is known as a trout and salmon fishing destination. The lake has

150-402: The crust in this region of Patagonia. The Marble Caves, Marble Chapel, and Marble Cathedral are unusual geological formations located on the shoreline midway along the lake's length. They represent a group of caverns, columns, and tunnels formed in monoliths of marble. The Marble Caves have been formed by wave action over the last 6,200 years. Slab window In geology , a slab window

165-432: The decreased lithospheric volume can also produce decompression melting. Slab window melts are distinguished from calc-alkaline subduction-related magmas by their different chemical compositions. The increase in temperature caused by the presence of a slab window can also produce anomalous high temperature metamorphism in the region between the trench and the volcanic arc. The geometry of a slab window depends primarily on

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180-412: The intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Buenos_Aires_Lake&oldid=932738747 " Category : Place name disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages General Carrera Lake The lake is of glacial origin and is surrounded by

195-409: The mantle wedge due to de-watering of the subducting slab. Slab-window magmatism may then replace this melting, and can be produced by multiple processes, including increased temperatures, mantle circulation producing interaction of supra- and sub-slab mantle, partial melting of subducted slab edges and extension in the upper plate. Mantle flowing upward through the slab window in order to compensate for

210-437: The present-day shape of the lake. The tectonic activity that formed the depression can be inferred to subduction of the triple joint that has occurred over the past 20 million years, as indicated by ripple marks in volcaniclastic sediments observed along the southern shoreline. There is some speculation on whether the tectonics and crustal heat flow in the lake area are influenced by the asthenospheric window that exists beneath

225-530: The second is when the ridge is parallel to the trench, causing a rectangular window to form. The North American Cordillera is a well-studied plate margin that provides a good example of the effects a slab window can have on an over-riding continental plate. Beginning in the Cenozoic , the fragmentation of the Farallon plate as it subducted caused slab windows to open that then generated anomalous features in

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