http://www.sciencedirect.com/science/article/pii/S1674987111001095 |
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| Authors: | Dezi Wang Liangshu Shu |
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| Institution: | State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China |
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| Abstract: | During the Late Mesozoic Middle JurassiceLate Cretaceous, basin and range tectonics and
associated magmatism representative of an extensional tectonic setting was widespread in southeastern
China as a result of Pacific Plate subduction. Basin tectonics consists of post-orogenic (Type I) and
intra-continental extensional basins (Type II). Type I basins developed in the piedmont and intraland
during the Late Triassic to Early Jurassic, in which coarse-grained terrestrial clastic sediments were
deposited. Type II basins formed during intra-continental crustal thinning and were characterized by
the development of grabens and half-grabens. Graben basins were mainly generated during the Middle
Jurassic and were associated with bimodal volcanism. Sediments in half-grabens are intercalated with
rhyolitic tuffs and lavas and are Early Cretaceous in age with a dominance of Late CretaceousePaleogene
red beds. Ranges are composed of granitoids and bimodal volcanic rocks, A-type granites and dome-type
metamorphic core complexes. The authors analyzed lithological, geochemical and geochronological
features of the Late Mesozoic igneous rock assemblages and proposed some geodynamical constraints
on forming the basin and range tectonics of South China. A comparison of the similarities and differences
of basin and range tectonics between the eastern and western shores of the Pacific is made, and the geodynamical
evolution model of the Southeast China Block during Late Mesozoic is discussed. Studied
results suggest that the basin and range terrane within South China developed on a pre-Mesozoic folded
belt was derived from a polyphase tectonic evolution mainly constrained by subduction of the western
Pacific Plate since the Late Mesozoic, leading to formation of various magmatism in a back-arc extensional
setting. Its geodynamic mechanism can compare with that of basin and range tectonics in the eastern shore of the Pacific. Differences of basin and range tectonics between both shores of the Pacific,
such as mantle plume formation, scales of extensional and igneous rock assemblages and the age of basin
and range tectonics, were caused mainly by the Yellowstone mantle plume in the eastern shore of the
Pacific. |
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| Keywords: | Basin and range tectonics Sedimentation Bimodal igneous rocks Late Mesozoic Geodynamic evolution Southeast China |
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