Metamorphism and Zircon Geochronological Studies of Metagabbro Vein in the Yushugou Granulite-Peridotite Complex from South Tianshan, China

Lu Zhang; Jianjiang Zhu; Bin Xia; Cong Zhang; Lifei Zhang

doi:10.1007/s12583-019-1254-5

Volume 30 Issue 6

Dec 2019

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Journal of Earth Science > 2019 > 30(6): 1215-1229.

Lu Zhang, Jianjiang Zhu, Bin Xia, Cong Zhang, Lifei Zhang. Metamorphism and Zircon Geochronological Studies of Metagabbro Vein in the Yushugou Granulite-Peridotite Complex from South Tianshan, China. Journal of Earth Science, 2019, 30(6): 1215-1229. doi: 10.1007/s12583-019-1254-5

Citation:

Lu Zhang, Jianjiang Zhu, Bin Xia, Cong Zhang, Lifei Zhang. Metamorphism and Zircon Geochronological Studies of Metagabbro Vein in the Yushugou Granulite-Peridotite Complex from South Tianshan, China. Journal of Earth Science, 2019, 30(6): 1215-1229. doi: 10.1007/s12583-019-1254-5

Citation:

Lu Zhang, Jianjiang Zhu, Bin Xia, Cong Zhang, Lifei Zhang. Metamorphism and Zircon Geochronological Studies of Metagabbro Vein in the Yushugou Granulite-Peridotite Complex from South Tianshan, China. Journal of Earth Science, 2019, 30(6): 1215-1229. doi: 10.1007/s12583-019-1254-5

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Metamorphism and Zircon Geochronological Studies of Metagabbro Vein in the Yushugou Granulite-Peridotite Complex from South Tianshan, China

doi: 10.1007/s12583-019-1254-5

Lu Zhang^{1,2
,
,
,},
Jianjiang Zhu³,
Bin Xia⁴,
Cong Zhang^3,5,
Lifei Zhang²

1.
Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
2.
Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China
3.
Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
5.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

More Information

Corresponding author: Lu Zhang
Received Date: 25 Jun 2019
Accepted Date: 23 Oct 2019
Publish Date: 01 Dec 2019

Abstract

Abstract

Yushugou granulite-peridotite complex, located at the east part of the northern margin of South Tianshan, may represent an ophiolitic slice subducted to 40-50 km depth with high-pressure granulite facies metamorphism. Although a lot of studies have been conducted on rocks in this belt, the rock as-sociation and tectonic background of the ophiolitic slice are still in dispute. A detailed study on petrology, phase equilibrium modeling and U-Pb zircon ages have been performed on the metagabbro vein in peridotite unit to constrain the tectonic evolution of the Yushugou granulite-peridotite complex. Three stages of mineral assemblage in the metagabbro were defined as stage Ⅰ:Cpx^A+Opx^A+Pl^A, which represents the original minerals of the metagabbro vein; stage Ⅱ:Cpx^B+Opx^B+Pl^B+Spl, which represents the mineral assemblage of granulite facies metamorphism with peak P-T conditions of 4.2-6.9 kbar and 940-1 070℃; stage Ⅲ is characterized by the existence of prehnite, thomsonite and amphibole in the matrix, indicating that the metagabbro vein may be influenced by fluids during retrograde metamorphism. Combined with the crosscut relationship, it can be deduced that the metagabbro vein, together with the peridotite in Yushugou granulite-peridotite complex has experienced similar high-temperature granulite facies metamorphism. The zircon chronological data shows that the protolith age of the metagabbro vein is 400.5±6.2 Ma, reflecting Devonian magmatism event and the granulite facies metamorphism occurred at~270 Ma which may be related to the post-collisional magmatism.
- metagabbro vein,
- granulite facies metamorphism,
- P-T pseudosection,
- U-Pb zircon da-ting,
- South Tianshan

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References(81)

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