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Zircon U-Pb Dating and Geochemical Characteristics of Zaohuogou Granitoids in the Middle Part of East Kunlun, China and Their Tectonic Significance(PDF)


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Zircon U-Pb Dating and Geochemical Characteristics of Zaohuogou Granitoids in the Middle Part of East Kunlun, China and Their Tectonic Significance
JIAN Kun-kun12 HE Yuan-fang12 ZHAO Duan-chang12 GAO Feng12 WANG Xing12 YUAN Zhang12
1. Shaanxi Institute of Geological Survey, Xi’an 710054, Shaanxi, China; 2. Shaanxi Mineral Resources and Geological Survey, Xi’an 710068, Shaanxi, China
I-type granitoid geochemistry zircon U-Pb age petrogenesis Middle Permian magma mixing continental arc East Kunlun
P595; P597
Zaohuogou granitoids in the middle part of East Kunlun consist of quartz-diorite, tonalite, granodiorite and monzogranite. The rocks are characterized by variable SiO2 contents(60.94%-74.14%), moderate to high Al2O3 and total alkaline(the contents of Al2O3 and Na2O+K2O are 12.73%-16.22% and 4.51%-7.61%), suggesting that Zaohuogou granitoids belong to I-type with middle-high potassium calc-alkaline and meta-aluminous to weak peraluminous. The total content of REE is low((106.62-182.76)×10-6)with an average of 144.25×10-6. They are characterized by relative enrichment in large ion lithophile elements(LILEs)and light rare earth elements(LREEs), but depletion in high field strength elements(HFSEs), in addition, they show Ti, Nb and Ta negative anomaly on the primitive mantle-normalized trace element spider diagram. LA-ICP-MS Zircon U-Pb dating shows that Zaohuogou granitoids are formed in 262-260 Ma, belong to the late Middle Permian. The geochemical characteristics indicate that the granitoids are formed in a continental margin arc environment. Combined with the regional geological background and previous data, it is suggested that the Paleotethys ocean begins to subduct northward beneath East Kunlun terrane in the late Middle Permian. During the subduction of Paleotethys ocean, the mantle-derived melts intrude into the lower crust and result in partial melting of lower crust leading to development of granitic magma. The magma is formed by magma mixing of the mantle-derived and crust-derived melts, then experiences some degree of crystallization differentiation, and finally consolidates into the granitoids.


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Last Update: 2020-09-20