Chaicayán Group
| Chaicayán Group | |
|---|---|
| Stratigraphic range: Miocene | |
| Type | Group |
| Overlies | Metamorphic basement |
| Lithology | |
| Primary | Sandstone, siltstone |
| Other | Conglomerate |
| Location | |
| Region | Aysén Region |
| Country |  Chile |
| Type section | |
| Named by | Forsythe et al., 1985 |
Chaicayán Group is a group of poorly defined sedimentary rock strata found in Taitao Peninsula in the west coast of Patagonia. The most common rock types are siltstone and sandstone. Conglomerate occur but is less common.[1]
Study of fossils and uranium–lead dating of detrital zircons indicate a Miocene age, at least for the upper sequences. The Chaicayán Group deposited likely as a result of a marine transgression that drowned much of Patagonia and Central Chile in the Late Oligocene and Miocene.[1]
The group is intruded by porphyritic stocks and sills of Pliocene age.[1]
See also
[edit]References
[edit]- ^ a b c Encinas, Alfonso; Folguera, Andrés; Bechis, Florencia; Finger, Kenneth L.; Zambrano, Patricio; Pérez, Felipe; Benarbé, Pablo; Tapia, Francisca; Riffo, Ricardo; Buatois, Luis; Orts, Darío; Nielsen, Sven N.; Valencia, Victor V.; Cituño, José; Oliveros, Verónica; De Girolamo Del Mauro, Lizet; Ramos, Víctor A. (2018). "The Late Oligocene–Early Miocene Marine Transgression of Patagonia". In Folguera, A.; Contreras Reyes, E.; Heredia, N.; et al. (eds.). The Evolution of the Chilean-Argentinean Andes. Springer. pp. 443–474. ISBN 978-3-319-67774-3.
