Precise timing of the Early Paleozoic metamorphism and thrust deformation in the Eastern Kunlun Orogen |
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Authors: | Nengsong Chen Min Sun Lei He Kexin Zhang Guocan Wang |
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Institution: | (1) Faculty of Earth Sciences, China University of Geosciences, 430074 Wuhan, China;(2) Department of Earth Sciences, The University of Hong Kong, Hong Kong, China |
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Abstract: | In Dulan County, Qinghai Province NW China, the arc volcanic sequences in the northern side of the Central Fault of the East
Kunlun were metamorphosed progressively from upper greenschist facies in the south to epidoteamphibolite facies in the north.
High-angle thrust deformation was developed synchronously with the peak metamorphim and superimposed with later low-angle
striking-slip deformation. Zircon U-Pb dating yields a concordant age of (448± 4) Ma for the metavolcanics. Syn-kinematic
hornblende and muscovite separated from the high-angle thrusting belt give 40Ar–39Ar plateau age of (427± 4) Ma and 408 Ma, respectively. These results precisely constrain the timing of the closure of early
Paleozoic volcanic basin (Proto-Tethys) over the eastern portion of the East Kunlun Orogen, and the thrust tectonic slice
had a cool rate of ca. 9°C/Ma. |
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Keywords: | East Kunlun Mountains metamorphic and deformation event geochronology |
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