Kinematic constraints on intra-arc shear and strain partitioning in the 
southern Andes between 38°S and 42°S latitude

Rosenau, Matthias; Melnick, D.; Echtler, Helmut

doi:10.1029/2005TC001943

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Kinematic constraints on intra-arc shear and strain partitioning in the southern Andes between 38°S and 42°S latitude

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Rosenau, Matthias
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Melnick, D.
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Echtler, Helmut
Deutsches GeoForschungsZentrum;

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Citation

Rosenau, M., Melnick, D., Echtler, H. (2006): Kinematic constraints on intra-arc shear and strain partitioning in the southern Andes between 38°S and 42°S latitude. - Tectonics, 25, 4, TC4013.
https://doi.org/10.1029/2005TC001943

https://gfzpublic.gfz-potsdam.de/pubman/item/item_234681

Abstract

On the basis of structural field work, fault kinematic analysis, and the analysis of digital imagery, we describe the northern part of the southern Andean intra-arc Liquiñe-Ofqui Fault Zone (LOFZ) as an SC-like fault zone system accommodating part of the Nazca–South American plate convergence obliquity. Kinematic modeling suggests that the LOFZ accommodated 124 (+24/−21) km of dextral displacement between 40°S and 42°S and 67 (+13/−11) km between 38°S and 40°S since the Pliocene. Associated vertical axis rotations are 31 ± 4° clockwise and 9 ± 1° counterclockwise along synthetic and antithetic faults, respectively. Mean Pliocene to recent shear rates along the LOFZ decrease northward from 32 ± 6 mm/yr to 13 ± 3 mm/yr compatible with partitioning of half of the convergence obliquity into the intra-arc zone north of 40°S and complete partitioning to the south. The displacement gradient along the intra-arc zone results in margin-parallel shortening of the fore arc.