Divisadero Group
Stratigraphic range: Aptian–Albian
TypeGeologic group
UnderliesCerro Plataforma, La Cascada, Ligorio Márques & Cardiel Formations
OverliesCoihaique Group
Lithology
PrimaryPyroclastic rock, lava
Location
LocationPatagonia
Coordinates45°30′S 72°00′W / 45.500°S 72.000°W / -45.500; -72.000
RegionChubut Province
Aysén Region
CountryArgentina
Chile
ExtentMagallanes or Austral Basin
Type section
Named byHeim
Year defined1940
Divisadero Group is located in Argentina
Divisadero 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]

See also

  • Geology of Aysén Region
  • Cretaceous South America

References

  1. 1 2 3 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.
  2. 1 2 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.
  3. ↑ Aptian-Albian subaerial volcanic rocks in central Patagonia: Divisadero and Chubut Groups
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