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Famatinian orogeny

Paleogeographic reconstruction of Gondwana and Laurentia about 70 million years before the Famatinian orogeny. The Famatinian orogeny took place near the right border of the area marked as "Río Plata". Terranes and microcontinents such as Cuyania, Pampia and Chilenia are omitted.

The Famatinian orogeny (Spanish: Orogenia de Famatina) is an orogeny that predates the rise of the Andes and that took place in what is now western South America[note 1] during the Paleozoic, leading to the formation of the Famatinian orogen also known as the Famatinian belt. The Famatinian orogeny lasted from the Late Cambrian to at least the Late Devonian and possibly the Early Carboniferous, with orogenic activity peaking about 490 to 460 million years ago.[1] The orogeny involved metamorphism and deformation in the crust and the eruption and intrusion of magma along a Famatinian magmatic arc that formed a chain of volcanoes.[2] The igneous rocks of the Famatinian magmatic arc are of calc-alkaline character and include gabbros, tonalites, granodiorites and trondhjemites.[1][3] The youngest igneous rocks of the arc are granites.[1]

Part of the pegmatite dykes of the Pampean Pegmatite Province formed during the orogeny.[4] These dykes are thought to be derived from S-type granitic melts.[4]

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]


Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).

  1. ^ a b c 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.
  2. ^ 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.
  3. ^ Geuna, Silvana E.; Escostegoy, Leonardo D.; Díaz Appella, Belena; Pinotti, Lucio; D'Eramo, Fernando; Hollanda, Maria Helena B.M. (2021). "The geodynamic evolution of the Famatinian orogen from the paleomagnetic record of El Hongo trondhjemite (Early Paleozoic, Sierras Pampeanas de Córdoba, Argentina)". Journal of South American Earth Sciences. 106: 103059. Bibcode:2021JSAES.10603059G. doi:10.1016/j.jsames.2020.103059. S2CID 229455476.
  4. ^ a b Galliski, Miguel Ángel; Márquez-Zavalía, María Florencia; Roda-Robles, Encarnación; von Quadt, Albrecht (2022). "The Li-Bearing Pegmatites from the Pampean Pegmatite Province, Argentina: Metallogenesis and Resources". Minerals. 12 (7). MDPI: 841. Bibcode:2022Mine...12..841G. doi:10.3390/min12070841. hdl:10810/57221.
  5. ^ 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.
  6. ^ Pinotti, L.P.; Coniglio, J.E.; Esparza, A.M.; D'Eramo, F.J.; Llambías, E.J. (2002). "Nearly circular plutons emplaced by stoping at shallow crustal levels, Cerro Aspero batholith, Sierras Pampeanas de Córdoba, Argentina". Journal of South American Earth Sciences. 15 (2): 251–265. Bibcode:2002JSAES..15..251P. doi:10.1016/S0895-9811(02)00033-0.

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