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Rosenau et al. 2006
Rosenau, M., Melnick, D. and 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: doi: 10.1029/2005TC001943. issn: 0278-7407.

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 Liqui¿e-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.

BACKGROUND DATA FILES

Abstract

Keywords
Tectonophysics, Continental margins, convergent, Tectonophysics, Continental neotectonics, Tectonophysics, Volcanic arcs, Geographic Location, South America, Information Related to Geologic Time, Neogene
Journal
Tectonics
Publisher
American Geophysical Union
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