Home > Archive>Volume 93, Issue 5, 2019 >1188-1204. DOI:10.1111/1755-6724.14353
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Chronological Constraints on Late Paleozoic Collision in the Southwest Tianshan Orogenic Belt, China: Evidence from the Baleigong Granites
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This study was financially supported by the National Natural Science Foundation of China (Grant Nos.U1403292, 41472196, 41502085, and 41902214), the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2015BAB05B04, 2018YFC0604005), and the China Geological Survey Bureau (JYYWF20183702, JYYWF20180602). We are grateful to Prof. Yongjun Di (The China University of Geosciences (Beijing), China) for providing wonderful suggestions for our study. Authors give our sincerest thanks to two anonymous reviewers for their critical and detailed review sand enlightening suggestions that improved the manuscript greatly. We thanks Xiaohu Wang, Jiling Li, Tao Zhang, Ji Ma and Zhilei Ding for assistance during the fieldwork. We are grateful for the laboratory assistance provided by Zhihui Dai at the State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry Chinese Academy of Sciences, Guiyang, China.

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    Abstract:

    The Baleigong granites, located in the western part of the southwestern Tianshan Orogen (Kokshanyan region, China), records late Paleozoic magmatism during the late stages of convergence between the Tarim Block and the Central Tianshan Arc Terrane. We performed a detailed geochronological and geochemical study of the Baleigong granites to better constrain the nature of collisional processes in the Southwest Tianshan Orogen. The LA-ICP-MS U-Pb zircon isotopic analyses indicate that magmatism commenced in the early Permian (~282 Ma). The granite samples, which are characterized by high contents of SiO2 (67.68–69.77 wt%) and Al2O3 (13.93–14.76 wt%), are alkali-rich and Mg-poor, corresponding to the high-K calc-alkaline series. The aluminum saturation index (A/CNK) ranges from 0.93 to 1.02, indicating a metaluminous to slightly peraluminous composition. Trace element geochemistry shows depletions in Nb, Ta, and Ti, a moderately negative Eu anomaly (δEu=0.40–0.56), enrichment in LREE, and depletion in HREE ((La/Yb)N=7.46–11.78). These geochemical signatures are characteristic of an I-type granite generated from partial melting of a magmatic arc. The I-type nature of the Baleigong granites is also supported by the main mafic minerals being Fe-rich calcic hornblende and biotite. We suggest that the high-K, calc-alkaline I-type granitic magmatism was generated by partial melting of the continental crust, possibly triggered by underplating by basaltic magma. These conditions were likely achieved in a collisional tectonic setting, thus supporting the suggestion that closure of the South Tianshan Ocean was completed prior to the Permian and was followed (in the late Paleozoic) by collision between the Tarim Block and the Central Tianshan Arc Terrane.

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HUO Hailong, CHEN Zhengle, ZHANG Qing, HAN Fengbin, ZHANG Wengao, SUN Yue, YANG Bin, TANG Yanwen.2019. Chronological Constraints on Late Paleozoic Collision in the Southwest Tianshan Orogenic Belt, China: Evidence from the Baleigong Granites[J]. Acta Geologica Sinica(),93(5):1188-1204

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History
  • Received:May 15,2019
  • Revised:August 14,2019
  • Online: October 29,2019
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