Type Geological formation Named for Traiguén Island | Country Chile Region Aysén Region | |
Primary Tuff, basaltic pillow lava, breccia, sandstone, shale Named by Espinoza and Fuenzalida (1971) | ||
Traiguén Formation (Spanish: Formación Triaguén) is a volcano-sedimentary formation of Miocene age, located in the Aysén Region of western Patagonia, southern Chile.
Geology
The volcanic and sedimentary rocks were deposited in a marine environment. Neither the base nor the top of the formation is known. Copious dykes of basic composition and aphanitic texture intrude the formation.
At some locations Miocene plutons of the North Patagonian Batholith intrude the Traiguén Formation. The intruded plutons are of varied composition including gabbro and granodiorite.
References
Traiguén Formation Wikipedia(Text) CC BY-SA