Trapa-Trapa Formation

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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 the Farellones Formation.[1]

Trapa-Trapa Formation
Stratigraphic range: Miocene
TypeGeological formation
UnderliesCola de Zorro Formation
Campanario Formation
OverliesCura-Mallín Group
Lithology
PrimaryAndesitic lava, basaltic andesite lava, pyroclastic rocks, epiclastic rocks
OtherBasaltic lava, dacitic lava, tuff
Location
Coordinates38°00′S 71°36′W / 38.0°S 71.6°W / -38.0; -71.6
RegionAraucanía, Bío Bío & Maule Regions
Neuquén Province
Country Chile
 Argentina
Type section
Named forEstero Trapa-Trapa
Trapa-Trapa Formation is located in Chile
Trapa-Trapa Formation
Trapa-Trapa Formation (Chile)

References

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  1. ^ 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.