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 commones 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

References

  1. 1 2 3 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., Encinas, A., B. Iannelli, S., Oliveros, V., M. Dávila, F., Collo, G., Giambiagi, L., Maksymowicz, A., Iglesia Llanos, M.P., Turienzo, M., Naipauer, M., Orts, D., D. Litvak, V., Alvarez, O., Arriagada, C. The Evolution of the Chilean-Argentinean Andes. Springer. pp. 443–474. ISBN 978-3-319-67774-3.
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