Английская Википедия:Chon Aike Formation
Шаблон:Infobox rockunit The Chon Aike Formation is an extensive geological formation, present in the Deseado Massif in north-central Santa Cruz Province, Patagonia, Argentina. It covers an area of approximately Шаблон:Convert and consists of rhyolitic volcanic rocks, particularly ignimbrites and lavas, with smaller amounts of agglomerates and tuffs.[1] Within dacitic rocks, plant fossils have been found.[2]
Description
The Chon Aike Formation forms part of the Chon Aike Province, also known as the Tobífera Series, a large igneous province that covers Шаблон:Convert.[3]
The northern part of the formation, Río Pinturas, has been dated to the Late Jurassic (140–160 Шаблон:Abbr), while the western and eastern sections have been dated to 162 ± 11 Ma and 168 ± 2 Ma respectively, indicating Middle Jurassic eruptions. Fossil flora, however, suggests a Middle to Late Jurassic age. (See La Matilde Formation.)[4]
During the break-up of Gondwana around 180–165 Ma, the opening of the Weddell Sea lead to extension along the western margin of the South American Plate, resulting in intra-plate volcanism in the Chon Aike area and rifting in the Magallanes Basin.[5] The Chon Aike volcanism was probably related to the subduction of the Pacific Phoenix and Farallon plates.[6]
According to Riley, "Early Jurassic silicic volcanic rocks of the Chon Aike Province (V1: 187-182 Ma) are recognized from many localities in the southern Antarctic Peninsula and northeast Patagonia and are essentially coeval with the extensive Karoo (182 Ma) and Ferrar (183 Ma) large igneous provinces of pre-breakup Gondwana.[7]
See also
References
Bibliography
Further reading
- R. E. Barrio, O.G. Arrondo, A.E. Artabe and B. Petriella. 1982. Estudio geologico y paleontologico de los alrededores de la Estancia Bajo Pellegrini, Provincia de Santa Cruz. Revista del Asociacion Geologica Argentina 37(3):285-299
- Английская Википедия
- Geologic formations of Argentina
- Jurassic System of South America
- Lower Cretaceous Series of South America
- Jurassic Argentina
- Cretaceous Argentina
- Tithonian Stage
- Berriasian Stage
- Tuff formations
- Cretaceous volcanism
- Jurassic volcanism
- Austral or Magallanes Basin
- Fossiliferous stratigraphic units of South America
- Paleontology in Argentina
- Geology of Santa Cruz Province, Argentina
- Geology of Patagonia
- Geology of Tierra del Fuego
- Rhyolite formations
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- Страницы с телепортом
- Википедия
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