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Crustal and upper mantle investigations using receiver functions and tomographic inversion in the Southern Puna Plateau region of the Central Andes

Authors
/persons/resource/heit

Heit,  Benjamin
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/yuan

Yuan,  Xiaohui
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/mbianchi

Bianchi,  Marcelo
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Jakovlev,  A.
External Organizations;

Kumar,  P.
External Organizations;

Mahlburg Kay,  S.
External Organizations;

Sandvol,  E. A.
External Organizations;

Alonso,  R.
External Organizations;

Coira,  B.
External Organizations;

Comte,  D.
External Organizations;

Brown,  L. D.
External Organizations;

/persons/resource/kind

Kind,  Rainer
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Heit, B., Yuan, X., Bianchi, M., Jakovlev, A., Kumar, P., Mahlburg Kay, S., Sandvol, E. A., Alonso, R., Coira, B., Comte, D., Brown, L. D., Kind, R. (2011): Crustal and upper mantle investigations using receiver functions and tomographic inversion in the Southern Puna Plateau region of the Central Andes, AGU 2011 Fall Meeting (San Francisco, USA 2011).


https://gfzpublic.gfz-potsdam.de/pubman/item/item_244618
Abstract
We present here the results obtained using the data form our passive seismic array in the southern Puna plateau between 25°S to 28°S latitude in Argentina and Chile. In first instance we have been able to calculate P and S receiver functions in order to investigate the Moho thickness and other seismic discontinuities in the study area. The RF data shows that the northern Puna plateau has a thicker crust and that the Moho topography is more irregular along strike. The seismic structure and thickness of the continental crust and the lithospheric mantle beneath the southern Puna plateau reveals that the LAB is deeper to the north of the array suggesting lithospheric removal towards the south. Later we performed a joint inversion of teleseismic and regional tomographic data in order to study the distribution of velocity anomalies that could help us to better understand the evolution of the Andean elevated plateau and the role of lithosphere-asthenosphere interactions in this region. Low velocities are observed in correlation with young volcanic centers (e.g. Ojos del Salado, Cerro Blanco, Galan) and agree very well with the position of crustal lineaments in the region. This is suggesting a close relationship between magmatism and lithospheric structures at crustal scale coniciding with the presence of hot asthenospheric material at the base of the crust probably induced by lithospheric foundering.