Divisadero Group

South American geological formation group

Divisadero Group (Argentina)

The Divisadero Group is a group of geological formations in the Magallanes Basin (Chile) or Austral Basin (Argentina) of northwestern Patagonia. It overlies the Coihaique Group.^[1] The group is chiefly made up of pyroclastic rocks and lavas of the calc-alkaline magma series.^[1] Rocks are of andesite and rhyolite composition.^[2]

Geographic extent

In Chile, the formation crops out in Aysén Region^[1] while in Argentina it can be found in Chubut Province.^[2]

Tectonic movements during the Miocene have significantly deformed Divisadero Group.^[3]

References

^ ^a ^b ^c Suárez, Manuel; de la Cruz, Rita (1994). Estratigrafía y paleogeografía mesozoica de Aisén nororiental (45-46 lat.s.), Chile (PDF). 7° Congreso Geológico Chileno (in Spanish). Concepción: Universidad de Concepción. pp. 538–542. Archived from the original (PDF) on December 28, 2017.
^ ^a ^b Haller, Miguel J.; Lapido, Omar R. (1980). "El Mesozoico de la Cordillera Patagónica Central". Revista de la Asociación Geológica Argentina (in Spanish). XXXV (2): 230–247. Retrieved January 4, 2018.
^ Aptian-Albian subaerial volcanic rocks in central Patagonia: Divisadero and Chubut Groups

Geology of Chile

Terranes

Arequipa-Antofalla
Chaitenia
Chilenia
Chiloé
Cuyania
Fitz Roy
Madre de Dios
Mejillonia
Patagonia

Sedimentary
formations
and groups

Cretaceous	Baños del Flaco Fm. Cerro Colorado Fm. Chacarilla Fm. Chañarcillo Gp. Coihaique Gp. Divisadero Gp. Dorotea Fm. Hornitos Fm. La Liga Fm. Ñirehuao Fm. Punta del Cobre Fm. Purilactis Gp. Quiriquina Fm. Viñita Fm. Way Gp. Zapata Fm.
Jurassic	Chacarilla Fm. Coihaique Gp. Ibáñez Fm. La Liga Fm. La Negra Fm. Nacientes del Biobío Fm. Nacientes del Teno Fm. Pan de Azúcar Fm. Tobífera Fm.
Triassic	Canto del Agua Fm. Choiyoi Gp. Panguipulli Fm. Santa Juana Fm. Tralcán Fm.