Phase Equilibrium Modeling of Retrograded Eclogite at the Kekesu Valley, Eastern Segment of SW Tianshan Orogen and Tectonic Implications

Bin Xia; Qin Yang; Neng-Song Chen; Zhiqiang Zhou

doi:10.1007/s12583-018-0844-y

Volume 29 Issue 5

Oct 2018

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Journal of Earth Science > 2018 > 29(5): 1060-1073.

Bin Xia, Qin Yang, Neng-Song Chen, Zhiqiang Zhou. Phase Equilibrium Modeling of Retrograded Eclogite at the Kekesu Valley, Eastern Segment of SW Tianshan Orogen and Tectonic Implications. Journal of Earth Science, 2018, 29(5): 1060-1073. doi: 10.1007/s12583-018-0844-y

Citation:

Bin Xia, Qin Yang, Neng-Song Chen, Zhiqiang Zhou. Phase Equilibrium Modeling of Retrograded Eclogite at the Kekesu Valley, Eastern Segment of SW Tianshan Orogen and Tectonic Implications. Journal of Earth Science, 2018, 29(5): 1060-1073. doi: 10.1007/s12583-018-0844-y

Citation:

Bin Xia, Qin Yang, Neng-Song Chen, Zhiqiang Zhou. Phase Equilibrium Modeling of Retrograded Eclogite at the Kekesu Valley, Eastern Segment of SW Tianshan Orogen and Tectonic Implications. Journal of Earth Science, 2018, 29(5): 1060-1073. doi: 10.1007/s12583-018-0844-y

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Phase Equilibrium Modeling of Retrograded Eclogite at the Kekesu Valley, Eastern Segment of SW Tianshan Orogen and Tectonic Implications

doi: 10.1007/s12583-018-0844-y

Bin Xia^{1,2
,
,},
Qin Yang²,
Neng-Song Chen^1,3,
Zhiqiang Zhou^1,2

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Center for Global Tectonics, China University of Geosciences, Wuhan 430074, China

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Corresponding author: Bin Xia
Received Date: 26 Mar 2018
Accepted Date: 25 Apr 2018
Publish Date: 01 Oct 2018

Abstract

Abstract

In this study, we report newly found strongly retrograded eclogite blocks in the Kekesu Valley, eastern segment of southwestern Tianshan, northwestern China. Based on detailed petrographical studies and mineral chemistry analyses, we constrain P-T evolution of two representative samples via phase equilibrium modeling method using THERMOCALC software. The peak stage is evidenced by the primary inclusions of omphacite+glaucophane+lawsonite (inferred)+chlorite+white mica in garnet. Using grossular and pyrope isopleth thermobarometry in garnet, the P peak conditions for this stage were constrained to be~23 kbar, 480-500℃ and the T peak conditions were constrained to be 19-20 kbar, 500-520℃. Subsequent exhumation led to the transformation of lawsonite to epidote. Using Si-in-phengite barometry, the P was constrained to be 16-20 kbar at T of 500-520℃ for this stage. Further retrograde stage was evidenced by the mineral assemblages of glaucophane+garnet+epidote+paragonite+ chlorite+white mica+quartz. Later stage retrogression is evidenced by glaucophane+epidote+chlorite+ quartz+white mica+albite+actinolite with P of 5-9 kbar when T < 490℃, indicating the eclogite may have been exhumed to the middle crust level and overprinted by blueschist-greenschist facies metamorphism. The results show that eclogite at the eastern segment of SW Tianshan shares similar P-T path to the HP rocks from the western segment, implying a similar P-T evolution for these rocks.
- eclogite,
- P-T path,
- phase equilibria,
- southwestern Tianshan,
- Kekesu Valley

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References(44)

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Phase Equilibrium Modeling of Retrograded Eclogite at the Kekesu Valley, Eastern Segment of SW Tianshan Orogen and Tectonic Implications

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Phase Equilibrium Modeling of Retrograded Eclogite at the Kekesu Valley, Eastern Segment of SW Tianshan Orogen and Tectonic Implications

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