Evolution of an Andean Margin: A Tectonic and Magmatic View from the Andes to the Neuque´n Basin (35°-39°S lat)

Evolution of the late Miocene Chachahuén volcanic complex at 37°S over a transient shallow subduction zone under the Neuquén Andes
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Published:January 01, 2006
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CiteCitation
Suzanne Mahlburg Kay, Oscar Mancilla, Peter Copeland, 2006. "Evolution of the late Miocene Chachahuén volcanic complex at 37°S over a transient shallow subduction zone under the Neuquén Andes", Evolution of an Andean Margin: A Tectonic and Magmatic View from the Andes to the Neuque´n Basin (35°-39°S lat), Suzanne Mahlburg Kay, Victor A. Ramos
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The evolving chemistry of the Chachahuén volcanic complex provides evidence for transient entry of a subduction zone component into the mantle wedge over a late Miocene shallow subduction zone under the Neuquén Basin. The Chachahuén complex, which is in the backarc of the Andean Southern Volcanic Zone near 37°S and some 500 km east of the Chile Trench, occurs at the intersection of NE and SE fault systems that parallel regional trends. Support for a shallow subduction-zone setting at the time of eruption and during the contractional uplift of the Sierra de Chachahuén comes from K/Ar and new 40Ar/...
- absolute age
- Andes
- andesites
- Ar/Ar
- Argentina
- back-arc basins
- basins
- calderas
- Cenozoic
- contraction
- dates
- East Pacific
- faults
- genesis
- geochemistry
- high-field-strength elements
- igneous rocks
- K/Ar
- lava
- magmas
- magmatism
- major elements
- mantle
- mantle wedges
- mineral assemblages
- Miocene
- models
- Neogene
- Neuquen Basin
- orientation
- Pacific Ocean
- Pampean Mountains
- Peru-Chile Trench
- phenocrysts
- relief
- rhyodacites
- South America
- stratovolcanoes
- subduction zones
- Tertiary
- trace elements
- uplifts
- upper Miocene
- volcanic features
- volcanic rocks
- volcanoes
- whole rock
- Chachahuen Complex
- Vizcachas Group
- Sierra de Chachahuen