首页|Late Triassic Intracontinental Deformation of South Tianshan,Central Asia:Evidence from Syn-tectonic Sedimentation and Detrital Zircon Provenances of the Kuqa Depression

Late Triassic Intracontinental Deformation of South Tianshan,Central Asia:Evidence from Syn-tectonic Sedimentation and Detrital Zircon Provenances of the Kuqa Depression

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The Tianshan range,a Paleozoic orogenic belt in Central Asia,has undergone multiple phases of tectonic activities characterized by the N-S compression after the early Mesozoic,including the far-field effects of the Cenozoic Indian-Asian collision.However,there are limited reports on the tectonic deformation and initiation of Triassic intracontinental deformation in the Tianshan range.Understanding this structural context is crucial for interpreting the early intracontinental deformation history of the Eurasian continent during the early Mesozoic.Growth strata and syn-tectonic sediments provide a rich source of information on tectonic activities and have been extensively used in the studies of orogenic belts.Based on detail fieldwork conducted in this study,the middle-late Triassic Kelamayi Formation of the northern Kuqa Depression in the southern Tianshan fold-thrust belt has been identified as the typical syn-tectonic growth strata.The youngest detrital zircon component in two lithic sandstone samples from the bottom and top of the Kelamayi growth strata yielded U-Pb ages of 223.4±3.1 and 215.5±2.9 Ma,respectively,indicating that the maximum depositional age of the bottom and top of the Kelamayi growth strata is 226-220 and 218-212 Ma.The geochronological distribution of detrital samples from the Early-Middle Triassic and Late Triassic revealed abrupt changes,suggesting a new source supply resulting from tectonic activation in the Tianshan range.The coupling relationship between the syn-tectonic sedimentation of the Kelamayi Formation and the South Tianshan fold-thrust system provides robust evidence that the Triassic intracontinental deformation of the South Tianshan range began at approximately 226-220 Ma(during the Late Triassic)and ended at approximately 218-212 Ma.These findings provide crucial constraints for understanding the intraplate deformation in the Tianshan range during the Triassic.

growth stratabasin-mountain couplingTriassicIndosinian eventKuqa DepressionSouth Tianshan

QIN Xiang、CHEN Xuanhua、SHAO Zhaogang、ZHANG Yiping、WANG Yongchao、LI Bing、SU He、WANG Ye、LIU Kui、HAN Lele

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China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China

Key Laboratory of Airborne Geophysics and Remote Sensing Geology,MNR,Beijing 100083,China

Chinese Academy of Geological Sciences,Beijing 100037,China

School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China

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国家重点研发计划China Geological SurveyChina Geological SurveyChina Geological SurveyChina Geological SurveyFundamental Research Funds from the Chinese Academy of Geological SciencesKey Laboratory of Airborne Geophysics and Remote Sensing Geology Ministry of Natural Resources

2018YFC0603700DD20230408DD20190011DD20191011DD20221824JKY2020112023YFL23

2024

10.1111/1755-6724.15157

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(3)
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