Zircon U-Pb Geochronology, Geochemistry of the Yusupuleke Granite Pluton in South Altyn and Its Geological Implications

被引：1
|
作者：
Gao D. [1 ,2 ]
Wu C. [1 ]
Gao Y. [1 ]
Zhang X. [1 ]
Chen H. [1 ,3 ]
Guo W. [1 ]
Wu D. [3 ]
Zheng K. [1 ]
机构：
[1] Institute of Geology, Chinese Academy of Geological Sciences, Beijing
[2] School of Earth Sciences, China University of Geosciences, Wuhan
[3] Faculty of Earth Sciences and Resources, China University of Geosciences, Beijing
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2019年 / 44卷 / 11期
关键词：
Geochemistry; Geological implication; I-type granite; South Altyn; U-Pb chronology; Yusupuleke;
D O I：
10.3799/dqkx.2018.279
中图分类号：
学科分类号：
摘要：
Yusupuleke pluton is one of the largest granite plutons in the south margin of the Altyn orogenic belt. It presents petrology, geochemistry, zircon U-Pb chronology to study the genesis and the evolution of the magmatism in this paper. The pluton is mainly composed of medium-coarse grained porphyritic biotite monzonitic granites and medium-fine grained phenocysts-bearing biotite monzonitic granites. The zircon U-Pb age of the former is 442-448 Ma while the latter is 423-430 Ma. The early granites belong to metaluminous series (A/CNK=0.97) and the late granites belong to weakly peraluminous series (A/CNK=1.04). Both of them show significant I-type granite characteristics with depletion in HREE, Ba, P, Sr, Ti, enrichment in LREE, Rb, Th, K, and slightly negative Eu anomaly. Combined with the geochronological data and the regional geological background, It is inferred that the Yusupuleke granites formed in an active continental margin tectonic setting related to the northward subduction of the South Altyn Ocean in Early Paleozoic. In the process of the tectonic regime transition, along with the upwelling of the mantle component, the partial melting of the juvenile crust formed the parent magma and the Yusupuleke granites crystallized after the fractionation of the magma. © 2019, Editorial Department of Earth Science. All right reserved.
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页码：3812 / 3828
页数：16
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