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Detailed Reference Information |
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. |
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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. |
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Abstract |
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Keywords
Tectonophysics, Continental margins, convergent, Tectonophysics, Continental neotectonics, Tectonophysics, Volcanic arcs, Geographic Location, South America, Information Related to Geologic Time, Neogene |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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