Volume 93, Issue 6 pp. 1850-1868
Original Article
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Provenance Variability of the Triassic Strata in the Turpan-Hami Basin: Detrital Zircon Record of Indosinian Tectonic Reactivation in the Eastern Tianshan

Shaohua ZHANG

Shaohua ZHANG

Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an, 710065 China

School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, 710065 China

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Chiyang LIU

Corresponding Author

Chiyang LIU

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069 China

Corresponding author. E-mail: [email protected].Search for more papers by this author
Jianke BAI

Jianke BAI

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069 China

Research Center of Orogenic Geology, Xi'an Center of Geological Survey, China Geological Survey, Xi'an, 710054 China

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Jianqiang WANG

Jianqiang WANG

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069 China

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Ming MA

Ming MA

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069 China

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Yuzhao GUAN

Yuzhao GUAN

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069 China

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Heng PENG

Heng PENG

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069 China

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First published: 30 December 2019
Citations: 7

About the first author:

ZHANG Shaohua, male, born in 1990 in Baoji City, Shaanxi Province, China. He is now a lecturer of Xi'an Shiyou University. His current research interests include basin analysis, regional tectonics, and petroleum geology. E-mail: [email protected].

About the Corresponding author:

LIU Chiyang, male, born in 1953 in Xi'an City, Shaanxi Province, China. He is currently a professor of Northwest University (China). He received his B.Sc. and M.Sc. degrees from Northwest University (China). His academic research career spans almost 40 years in the fields of basin analysis and petroleum geology. E-mail: [email protected].

Abstract

The Triassic strata in the Turpan-Hami Basin potentially chronicled the missing sedimentary record of Indosinian tectonic evolution in the Eastern Tianshan. In this study, we conducted detrital zircon U-Pb geochronological analyses on subsurface Triassic samples collected from the Turpan-Hami Basin to unravel sedimentary response of Indosinian tectonic reactivation and its geodynamics. The detrital zircon age spectra of the Triassic samples are quite different, reflecting significant provenance variability. The zircon grains in the Lower Triassic sample were mainly from the Central Tianshan, while the Jueluotag acted as a minor provenance. By contrast, the Late Paleozoic rocks in Jueluotag act as the main provenance for the Middle-Upper Triassic samples, while the Central Tianshan acted as a minor provenance. Furthermore, zircon grains in the Middle Triassic sample were mainly from the Permian rocks in Jueluotag, while Indosinian strike-slip-driven rapid exhumation brought deeper Carboniferous rocks of Jueluotag as an important age population for the Upper Triassic sample. The inter-sample variability of age spectra of the Triassic samples provides sedimentary evidence for Indosinian tectonic reactivation in the Eastern Tianshan and its periphery, which could be attributed to differential exhumation of different sources driven by coeval strike-slip tectonics along deep faults. The Indosinian tectonic behavior in the Eastern Tianshan, which is characterized by partial melting of the pre-thickened crust and strike-slip deformation, acted as a far-field respond to the coeval continental accretion occurring along the southern Eurasian margin. Additionally, our new detrital zircon data, together with previously published data in the Turpan-Hami Basin, demonstrate that there are significant changes in source-to-sink system from the Permian to the Triassic, suggesting that the Permian-Triassic unconformity in the Eastern Tianshan and its periphery was generated by Late Permian-Early Triassic tectonic contraction and inversion rather than an increasingly arid climate.

 

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