西准噶尔谢米斯台西段花岗岩年代学、地球化学、锆石Lu-Hf同位素特征及大地构造意义

杨钢; 肖龙; 王国灿; 高睿; 贺新星; 鄢圣武; 杨维; 晏文博; 周佩

doi:10.3799/dqkx.2015.043

Volume 40 Issue 3

Mar. 2015

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Article Navigation > Earth Science > 2015 > 40(3): 548-562

Yang Gang, Xiao Long, Wang Guocan, Gao Rui, He Xinxing, Yan Shengwu, Yang Wei, Yan Wenbo, Zhou Pei, 2015. Geochronology, Geochemistry and Zircon Lu-Hf Study of Granites in Western Section of Xiemisitai Area, Western Junggar. Earth Science, 40(3): 548-562. doi: 10.3799/dqkx.2015.043

Citation:

Yang Gang, Xiao Long, Wang Guocan, Gao Rui, He Xinxing, Yan Shengwu, Yang Wei, Yan Wenbo, Zhou Pei, 2015. Geochronology, Geochemistry and Zircon Lu-Hf Study of Granites in Western Section of Xiemisitai Area, Western Junggar. Earth Science, 40(3): 548-562. doi: 10.3799/dqkx.2015.043

Citation:

Yang Gang, Xiao Long, Wang Guocan, Gao Rui, He Xinxing, Yan Shengwu, Yang Wei, Yan Wenbo, Zhou Pei, 2015. Geochronology, Geochemistry and Zircon Lu-Hf Study of Granites in Western Section of Xiemisitai Area, Western Junggar. Earth Science, 40(3): 548-562. doi: 10.3799/dqkx.2015.043

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Geochronology, Geochemistry and Zircon Lu-Hf Study of Granites in Western Section of Xiemisitai Area, Western Junggar

doi: 10.3799/dqkx.2015.043

Yang Gang^{1, 2
,},
Xiao Long^{2
,
,},
Wang Guocan^{2, 3},
Gao Rui^{2, 4},
He Xinxing^{2, 5},
Yan Shengwu^{2, 6},
Yang Wei^{2, 7},
Yan Wenbo²,
Zhou Pei²

1.
Key Laboratory of Earthquake Geodesy, Institute of Earthquake, China Earthquake Administration, Wuhan 430071, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
5.
Geological Survey of Jiangsu Province, Nanjing210018, China
6.
Geological Survey of Sichuan Province, Chengdu 610081, China
7.
Institute of Geological Prospecting, Coal Mine Exploration of Guizhou Province, Guiyang 550008, China

Received Date: 2014-05-06
Publish Date: 2015-03-15

Abstract

Abstract

LA-ICP-MS U-Pb zircon age, geochemistry and Lu-Hf isotopic data for Xiemisitai and Halegaitexi granitic plutons in the western Junggar are presented in this paper, aiming to determine their forming ages, source regions and tectonic settings. LA-ICP-MS zircon yields 427.6±2.3 Ma for Xiemisitai alkali feldspar granites and 428.6±2.5 Ma for Halegaitexi alkali feldspar granites, respectively. Xiemisitai alkali feldspar granites are characterized as the Ⅰ-type granite, while Halegaitexi alkali feldspar granites have geochemical characteristics similar to the A-type granite. Zircon Lu-Hf isotopic compositions indicate that ε_Hf(t)=12.4-14.5, two-stage model ages (t_DM2) range from 497 to 603 Ma. The petrogenesis of Ⅰ-type and A-type granites were results of different evolutive phases of the same source magma in the compressible to extendable period of the post-collisional phase, which may be derived as follows. The southward subductional Irtysh-Zaysan Oceanic crust subductioned to the asthenospheric mantle which is the bottom of Boshchekul-Chingiz volcanic arc, resulted in the asthenospheric mafic magma underplating the lower crust. Then, the lower juvenile basaltic crust derived from the depleted mantle underwent different degrees of partial melting and fractional crystallization to a certain extent to generate the Ⅰ-type and A₂-type granites.
- LA-ICP-MS zircon U-Pb age,
- western section of Xiemisitai,
- Hf isotope,
- A-type granite,
- geochemistry

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