Malleco Formation (Spanish: Formación Malleco) is a geological formation of volcanic origin in the Andes of Araucanía Region (38–39° S), Chile. The formation is made up by volcaniclastic rocks, including tuffs, lahars and lavas of Pliocene–Early Pleistocene age.[1] It is considered equivalent to the Cola de Zorro Formation found further north in Chile and the so-called "Asociación volcánica de la precordillera oriental" located around the upper courses Bío Bío and Aluminé rivers.[1][2]
| Malleco Formation | |
|---|---|
| Stratigraphic range: Pliocene–Early Pleistocene | |
| Underlies | Quaternary Andean volcanoes |
| Overlies | Vizcacha-Cumilao Complex Cura-Mallín Formation Estratos de Huichahue Melipeuco Plutonic Group |
| Lithology | |
| Primary | Volcaniclastic rocks, lava |
| Location | |
| Region | Araucanía Region |
| Country |  Chile |
| Type section | |
| Named for | Malleco River |
| Named by | Suárez & Emparan |
| Year defined | 1997 |
References
edit- ^ a b Suárez, M. and Emparan, C. (1997). Hoja Curacautín, Carta geológica de Chile.[page needed]
- ^ Lara, Luis; Rodríguez, Carolina; Moreno, Hugo; Pérez de Arce, Carlos (July 2001). "Geocronología K-Ar y geoquímica del volcanismo plioceno superior-pleistoceno de los Andes del sur (39-42°S)" [K-Ar geochronology and geochemistry of the Upper Pliocene -Pleistocene volcanism of the southern Andes (39-42°S)]. Revista Geológica de Chile (in Spanish). 28 (1). doi:10.4067/S0716-02082001000100004.