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Complex patterns of fluid and melt transport in the central Andean subduction zone revealed by attenuation tomography.

Authors
/persons/resource/schurr

Schurr,  B.
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

/persons/resource/asch

Asch,  Günter
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Rietbrock,  A.
External Organizations;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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Trumbull,  Robert
4.2 Inorganic and Isotope Geochemistry, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

/persons/resource/haber

Haberland,  Christian
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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Citation

Schurr, B., Asch, G., Rietbrock, A., Trumbull, R., Haberland, C. (2003): Complex patterns of fluid and melt transport in the central Andean subduction zone revealed by attenuation tomography. - Earth and Planetary Science Letters, 215, 1-2, 105-119.
https://doi.org/10.1016/S0012-821X(03)00441-2


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_230405
Abstract
We present a high resolution 3-D model of P-wave attenuation for the central Andean subduction zone. Data from 1500, mostly intermediate depth (60 - 250 km) earthquakes recorded at three temporary seismic networks covering the forearc, arc, and backarc around 23° S were used for tomographic inversion. The forearc is characterised by uniformly high Qp values, indicating low temperature rocks, in accordance with low surface heat flow values. Continuous regions of low Qp connect earthquake clusters at 100 km and 200 km depth with zones of active wedge, where they induce melting, explain our observations. We propose that low Qp regions indicate source and vertical, as is often implicitely assumed. Instead, sources of fluids are located at different depth levels, and ascent Cerro Tuzgle id fed by mantel melts which are imaged as a plume of low Qp material that reaches to the strong earthquake cluster at 200 km depth.