A monogenetic volcanic field is a type of volcanic field consisting of a group of small monogenetic volcanoes , each of which erupts only once, as opposed to polygenetic volcanoes , which erupt repeatedly over a period of time. The small monogenetic volcanoes of these fields are the most common subaerial volcanic landform.
5-420: The Diamond Craters is a monogenetic volcanic field about 40 miles (64 km) southeast of Burns , Oregon . The field consists of a 27-square-mile (70 km) area of basaltic lava flows, cinder cones , and maars . The reexamination of radiocarbon dates from older studies and interpretation of paleomagnetic data and new radiocarbon dates limits the eruption of volcanic vents in this volcanic field to
10-626: The Auckland volcanic field . Other monogenetic volcanoes are tuff rings or maars . A monogenetic field typically contains between ten and a hundred volcanoes. The Michoacán-Guanajuato field in Mexico contains more than a thousand volcanoes and is exceptionally large. Monogenetic fields occur only where the magma supply to the volcano is low or where vents are not close enough or large enough to develop plumbing systems for continuous feeding of magma. Monogenetic volcanic fields can provide snapshots of
15-626: The area cited the craters' unusual research value, a "museum of basaltic volcanic features" apt to be destroyed by slab harvesting and associated heavy equipment. In 1982, the area gained additional protection when it was designated an Outstanding Natural Area . Monogenetic volcanic field Many monogenetic volcanoes are cinder cones , often with lava flows, such as Parícutin in the Michoacán-Guanajuato volcanic field , which erupted from 1943 to 1952. Some monogenetic volcanoes are small lava shields , such as Rangitoto Island in
20-629: The time period between 7320 and 7790 calendar years B.P. Diamond Craters and the nearby Diamond post office were named after the Diamond Ranch, established in the area by the pioneer Mace McCoy. The ranch used a diamond-shaped brand, hence the name. In the 1970s, Diamond Craters was a source of controversy between the Bureau of Land Management and commercial stonecutters who were illegally removing slabs of lava to sell as veneer for fireplaces, home exteriors, and chimneys. Geologists familiar with
25-428: The underlying region beneath the surface, and may be useful in studying the generation of magma and the composition of the mantle since the single eruption produced would match that of the chamber from which it erupted. The magma supplying such fields is thought to have rapidly ascended from its source region, with only short resident times (decades or less) in shallow magma chambers . This volcanology article
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