Trapa-Trapa Formation
| Trapa-Trapa Formation Stratigraphic range: Miocene | |
|---|---|
| Type | Geological formation |
| Underlies |
Cola de Zorro Formation Campanario Formation |
| Overlies | Cura-Mallín Formation |
| Lithology | |
| Primary | Andesite lava, basaltic andesite lava, pyroclastic rocks, epiclastic rocks |
| Other | Basalt lava, dacite lava, tuff |
| Location | |
| Region |
Araucanía Region, Bío Bío Region, Maule Region Neuquén Province |
| Country |
  |
| Type section | |
| Named for | Estero Trapa-Trapa |
Trapa-Trapa Formation (Spanish: Formación Trapa-Trapa) is a volcano-sedimentary formation of Miocene age in south-central Chile and nearby parts of Argentina. The largest outcrops lie in the Andes while the Chilean Central Valley host some of the smaller outcrops. The volcanic rocks of the formation are of calc-alkaline character, and are less silicic than contemporary volcanic rocks found further north in Farellones Formation.[1]
References
- ↑ Muñoz B., Jorge; Niemeyer R., Hans (1984). "Petrología de la formación Trapa-Trapa y consideraciones acerca del volcanismo mioceno entre los 36° y 39° lat. S (codillera principal)". Revista Geológica de Chile. 23: 53–67. Retrieved 23 August 2016.
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