Famatinian orogeny
The Famatinian orogeny (
Part of the
The relationship of the orogeny with the Achala and Cerro Aspero batholiths of central Argentina is not fully understood. These Devonian batholiths are possibly of post-orogenic character.[5][6]
Outcrops and sediments
The Famatinian orogen's main
In Peru's Cordillera Oriental a "Famatinian" orogeny exists which is coeval with the classical Famatinian orogeny found further south. In the time-span from 480 Ma to 435 Ma (Late Cambrian to Silurian) rocks of Cordillera Oriental were deformed and a magmatic arc developed.[9]
Towards what is now the east of the Famatinian magmatic arc a Precambrian sedimentary basin developed into a back-arc basin during the Ordovician. This basin went from Peru, through Bolivia to northwestern Argentina. The basin collected sediments from the Famatinian orogen and arc and while it did not contain oceanic crust it was a marine basin.[10]
Plate tectonic setting
Famatinian arc magmatism was caused by the subduction of Iapetus Ocean lithosphere beneath Gondwana.[8] As subduction went on, the peak of the orogeny resulted from the collision of the Cuyania terrane with Pampia in the Ordovician.[12]
It has been suggested that the coeval
Notes
- ^ All coordinates in this article are in relation to present-day geography and not to the past disposition of continents, terranes and oceans.
- ^ In other words: what is at present the northern end of the Famatinian orogen would have been connected with what is currently the southern end of the Taconic orogen.
References
- ^ a b c d e Alvarado, Patricia; Castro de Machuca, Brígida; Beck, Susan (2005). "Comparative seismic and petrographic crustal study between the Western and Eastern Sierras Pampeanas region (31ºS)" (PDF). Revista de la Asociación Geológica Argentina. 60 (4): 787–796.
- ^ González, Pablo Diego; Sato, Ana María; Basei, Miguel A.S.; Vlach, Silvio R.F.; Llambías, Jorge (2002). Structure, metamorphism and age of the Pampean-Famatinian orogenies in the western Sierra de San Luis (PDF). Actas XV Congreso Geológico Argentino. Retrieved 18 September 2015.
- S2CID 229455476.
- ^ hdl:10810/57221.
- ^ Lira, Raúl; Kirschbaum, Alicia M. (1990). "Geochemical evolution of granites". In Mahlburg Kay, Suzanne; Rapela, Carlos W. (eds.). Plutonism from Antarctica to Alaska. Geological Society of America Special Paper. Vol. 241. pp. 67–76.
- .
- ^ ISBN 9781862392199.
- ^ .
- .
- .
- ^ .
- ^ ISSN 1342-937X. Archived from the original(PDF) on 26 September 2015. Retrieved 18 September 2015.
- ^ . Retrieved 18 September 2015.
- ^ Dalla Salda, Luis H.; López de Luchi, Mónica.; Cingolani, Carlos A.; Varela, Ricardo (1998). "Laurentia-Gondwana collision: the origin of the Famatinian-Appalachian Orogenic Belt (a review)". In Pankhurst, R.J.; Rapela, C.W. (eds.). The Proto-Andean Margin of Gondwana. Vol. 142. Geological Society, London, Special Publications. pp. 219–234.
- ^ a b Bordonaro, Osvaldo (2016). "Trilobites laurénticos de la Formación La Laja (Cámbrico), Precordillera de San Juan, Argentina: un aporte biogeográfico al modelo alóctono de Precordillera". Revista de la Asociación Geológica Argentina (in Spanish). 73 (4).
External links
- Animation of world plate tectonics, note Cuyania's (red) trajectory from 0:20 onwards.