Abstract
Two types of tectonic deformations indicating different geodynamic settings are defined in the southwestern Primorye region. Near-latitudinal compression forces were responsible for the oldest, Late Paleozoic deformations. The Permian stratified complexes host a near-meridional system of folds and zones of dynamothermal metamorphism, cleavage, and foliation oriented orthogonally relative to the compression. Late Proterozoic (?) mafic-ultramafic rocks are characterized by similar deformations. In the Late Permian, the deformations were accompanied by granitoid magmatism controlled by fold and cleavage structures. The younger, Mesozoic deformations produced by near-meridional compression are represented by NE-trending sinistral strike-slip faults and their structural parageneses: an ENE-trending system of folds and downdip-thrusts both superimposed on Paleozoic protostructures and manifested in Mesozoic and Cenozoic sequences. It is inferred that, at the Paleozoic-Mesozoic boundary, near-latitudinal compression was replaced by near-meridional compression, probably, in response to the corresponding change in direction of the lateral displacement of the interacting Asian continent and (or) Pacific Plate.
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Original Russian Text © V.P. Utkin, P.L. Nevolin, A.N. Mitrokhin, 2007, published in Tikhookeanskaya Geologiya, 2007, Vol. 1, No. 4, pp. 3–21.
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Utkin, V.P., Nevolin, P.L. & Mitrokhin, A.N. Late Paleozoic and Mesozoic deformations in the southwestern Primorye region. Russ. J. of Pac. Geol. 1, 307–323 (2007). https://doi.org/10.1134/S181971400704001X
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DOI: https://doi.org/10.1134/S181971400704001X