U-Pb dating of zircon from the Central Zone of the East Kunlun Orogen and its implications for tectonic evolution |
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| Authors: | NengSong Chen Min Sun QinYan Wang KeXin Zhang YuSheng Wan HaiHong Chen |
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| Institution: | (1) Faculty of Earth Science, China University of Geosciences, Wuhan, 430074, China;(2) Department of Earth Sciences, the University of Hong Kong, Hong Kong SAR, China;(3) Beijing SHRIMP Center, Beijing, 100037, China;(4) State Key Laboratory of Geological Processes and Mineral Resources in China University of Geosciences, Wuhan, 430074, China |
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| Abstract: | LA-ICP-MS and SHRIMP U-Pb dating of zircons from orthogneisses and amphibolite from the Central Zone of the Kunlun Orogen
is reported in this paper. One orthogneiss sample has metamorphic zircons yielding weighted average 206Pb/238U age of 517.0 +5.0/−6.0 Ma, and the other orthogneiss sample contains zircons with inherited magmatic cores giving three
population 207Pb/206Pb ages of 955 Ma, 895 Ma and 657 Ma for the magmatic protolith, and metamorphic recrystallized rims with peak 206Pb/238U ages of 559 +12/−17 Ma and 516 ±13 Ma. The amphibolite yielded three populations of weighted average 206Pb/238U age of 482.0 +10/−8.0 Ma, 516.2 ± 5.8 Ma and 549 ± 10 Ma for the metamorphic zircons. These dating results recorded the
tectonothermal events that occurred in the early Paleozoic and the Precambrian time. The records of the Cambrian magmatic-metamorphic
event in the Qinling Orogen, the Altyn Tagh belt, north margin of the Qaidam Block and the Kunlun Orogen suggest that continental
assembly probably occurred in the early evolutionary history of the Proto-Tethys.
Supported by the National Natural Science Foundation of China (Grant Nos. 40772041 and 40272030) to Chen Nengsong and an Outstanding
Research Award of HKU to Sun Min |
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| Keywords: | zircon U-Pb dating East Kunlun Orogen Proto-Tethys tectonic evolution |
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