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Detailed Reference Information |
Balanyá, J.C., Crespo-Blanc, A., Díaz Azpiroz, M., Expósito, I. and Luján, M. (2007). Structural trend line pattern and strain partitioning around the Gibraltar Arc accretionary wedge: Insights as to the mode of orogenic arc building. Tectonics 26: doi: 10.1029/2005TC001932. issn: 0278-7407. |
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Mediterranean tectonics results in tight orogenic arcs enclosing back-arc basins of oceanic or thinned continental lithosphere. The Gibraltar Arc cannot be explained solely by the Europe-Africa plate convergence; therefore complementary mechanisms have been proposed. Most of them imply a westward motion of the arc and a general transpressive regime on both branches (Betic and Rif chains). A structural revision made along the western Gibraltar Arc allows us to generate a detailed kynematic map and to introduce new constraints on the possible arc formation mechanisms. Our results suggest that the strain partitioned into two main types of structures: structures accommodating suborthogonal shortening (folds and thrusts) and structures accommodating arc-parallel stretching (normal faults, conjugate strike-slip faults, and distributed minor structures). On the basis of the fan pattern depicted by the slip direction of contractional structures and the homogeneous distribution of arc-parallel stretching, an arc formation mode close to the piedmont glacier type is suggested. |
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Abstract |
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Keywords
Structural Geology, Kinematics of crustal and mantle deformation, Structural Geology, Regional crustal structure, Tectonophysics, Continental tectonics, compressional, Tectonophysics, Continental tectonics, extensional, 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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