Divisadero Group

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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′S72°00′W / 45.500°S 72.000°W / -45.500; -72.000
Region Chubut Province
Aysén Region
CountryArgentina, Chile
Extent Magallanes or Austral Basin
Type section
Named byHeim
Year defined1940
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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]

Contents

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

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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