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Chronological Constraints on Late Paleozoic Collision in the Southwest Tianshan Orogenic Belt, China: Evidence from the Baleigong Granites
Hailong HUO,
Zhengle CHEN,
Qing ZHANG,
Fengbin HAN,
Wengao ZHANG,
Yue SUN,
Bin YANG,
Yanwen TANG,
Hailong HUO
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
Search for more papers by this authorCorresponding Author
Zhengle CHEN
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
Faculty of Earth Sciences, East China University of Technology, Nanchang, 330013 China
Corresponding author. E-mail: [email protected]Search for more papers by this authorQing ZHANG
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
Search for more papers by this authorFengbin HAN
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049 China
Search for more papers by this authorWengao ZHANG
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
Search for more papers by this authorYue SUN
Faculty of Earth Sciences, East China University of Technology, Nanchang, 330013 China
Search for more papers by this authorBin YANG
Faculty of Earth Sciences, East China University of Technology, Nanchang, 330013 China
Search for more papers by this authorYanwen TANG
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081 China
Search for more papers by this authorHailong HUO,
Zhengle CHEN,
Qing ZHANG,
Fengbin HAN,
Wengao ZHANG,
Yue SUN,
Bin YANG,
Yanwen TANG,
Hailong HUO
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
Search for more papers by this authorCorresponding Author
Zhengle CHEN
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
Faculty of Earth Sciences, East China University of Technology, Nanchang, 330013 China
Corresponding author. E-mail: [email protected]Search for more papers by this authorQing ZHANG
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
Search for more papers by this authorFengbin HAN
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049 China
Search for more papers by this authorWengao ZHANG
Laboratory of Dynamic Diagenesis and Metallogenesis, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081 China
Key Laboratory of Paleomagnetism and Tectonic Reconstruct, Ministry of Natural Resources, Beijing, 100081 China
Search for more papers by this authorYue SUN
Faculty of Earth Sciences, East China University of Technology, Nanchang, 330013 China
Search for more papers by this authorBin YANG
Faculty of Earth Sciences, East China University of Technology, Nanchang, 330013 China
Search for more papers by this authorYanwen TANG
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081 China
Search for more papers by this authorAbout the first author:
HUO Hailong: male, born in 1988 in Shanxi Province; Ph. D., graduated from Chinese Academy of Geological Sciences. His current research interest focuses on the tectonic evolution of orogenic belts and the deformational processes. Email: [email protected] (H. Huo).
About the corresponding author:
CHEN Zhengle, male; born in 1967 in Wenzhou City, Zhejiang Province; doctor advisor; graduated from Peking University. He is now interested in tectonic process of the Tianshan Orogenic Belt, including subduction, collision, and the orogenic collapse. Email: [email protected] (Z. Chen).
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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