Geochemistry and Zircon U-Pb Geochronology of Early Paleozoic S-type Granites in the Eastern Qilian Block,Northwest China
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Geochemistry and Zircon U-Pb Geochronology of Early Paleozoic S-type Granites in the Eastern Qilian Block,Northwest China
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This work was financially supported by the Qinghai Science and Technology Department (Grant No.2016-ZJ-752) and Qinghai Salt Lake Industry (Grant No.E050DZ0801).We thank B. K. Li, E. F. Ren,Y. S. Du,and Q. H. Ren for their kind assistance with the paper and D. L. Gao for discussions on the petrogenesis and nature of the source. Susan Turner (Brisbane) assisted with English language.

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    Abstract:

    The Qilian Block (QB) is a Precambrian micro-continent located in the northeastern Qinghai–Tibet Plateau. Prevalent Lower Paleozoic granitic magmatic rocks crop out in the QB.A new integrated study of zircon U-Pb ages and systematic whole-rock geochemical data for the Xindian,Dongjiazhuang and Xiaogaoling granites in the eastern segment of the QB constrains their emplacement ages,petrogenesis,and regional evolutionary history.U-Pb dating reveals that the Xindian granite was emplaced 454 Ma, and both the Dongjiazhuang and Xiaogaoling granites were emplaced ca.440 Ma.Geochemical study shows that all granites belong to the high-K calc-alkaline to shoshonitic series and are S-type granites formed by partial melting of continental crust,mainly metagraywacke. We infer that these ca.454–445 Ma granites formed in a syn-collisional setting during the continental collisional between the Qaidam and Qilian blocks.

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LIU Xiuting, LI Binkai, HAN Jilong, REN Erfeng, GAO Donglin, DU Yongsheng, REN Qianhui, ZHANG Yan.2021. Geochemistry and Zircon U-Pb Geochronology of Early Paleozoic S-type Granites in the Eastern Qilian Block, Northwest China[J]. ACTA GEOLOGICA SINICA(English edition),95(2):439~458

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  • 收稿日期:2019-05-20
  • 最后修改日期:2019-12-14
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  • 在线发布日期: 2021-04-27
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