Geodynamics of a Cordilleran Orogenic System: The Central Andes of Argentina and Northern Chile

Imaging the Nazca slab and surrounding mantle to 700 km depth beneath the central Andes (18°S to 28°S)
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Published:January 01, 2015
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CiteCitation
Alissa Scire, C. Berk Biryol, George Zandt, Susan Beck, 2015. "Imaging the Nazca slab and surrounding mantle to 700 km depth beneath the central Andes (18°S to 28°S)", Geodynamics of a Cordilleran Orogenic System: The Central Andes of Argentina and Northern Chile, Peter G. DeCelles, Mihai N. Ducea, Barbara Carrapa, Paul A. Kapp
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The central Andes in South America is an ideal location to investigate the interaction between a subducting slab and the surrounding mantle to the base of the mantle transition zone. We used finite-frequency teleseismic P-wave tomography to image velocity anomalies in the mantle from 100 to 700 km depth between 18°S and 28°S in the central Andes by combining data from 11 separate networks deployed in the region between 1994 and 2009. Deformation of the subducting Nazca slab is observed in the mantle transition zone, with regions of both thinning and thickening of the slab that we suggest are related...
- Altiplano
- Andes
- asthenosphere
- body waves
- Brazil
- Brazilian Shield
- cratons
- delamination
- Eastern Cordillera
- elastic waves
- geophysical methods
- imagery
- lithosphere
- mantle
- Nazca Plate
- P-waves
- plate tectonics
- Puna
- seismic anomalies
- seismic methods
- seismic waves
- South America
- subduction
- thermal anomalies
- tomography
- transition zones
- upper mantle
- velocity structure
- volcanic fields
- Los Frailes volcanic field