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]
| Divisadero Group | |
|---|---|
| Stratigraphic range: Aptian–Albian | |
| Type | Geologic group |
| Underlies | Cerro Plataforma, La Cascada, Ligorio Márques & Cardiel Formations |
| Overlies | Coihaique Group |
| Lithology | |
| Primary | Pyroclastic rock, lava |
| Location | |
| Location | Patagonia |
| Coordinates | 45°30′S 72°00′W / 45.500°S 72.000°W |
| Region | Chubut Province Aysén Region |
| Country | Argentina Chile |
| Extent | Magallanes or Austral Basin |
| Type section | |
| Named by | Heim |
| Year defined | 1940 |
  Divisadero Group (Argentina) | |
Geographic extent
editIn 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]
See also
editReferences
edit- ^ 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