首页|Detrital Zircon Geochronology of Early Triassic Strata in the West Qinling Orogen:Implications for the Tectonic Evolution of the Paleo-Tethyan Ocean

Detrital Zircon Geochronology of Early Triassic Strata in the West Qinling Orogen:Implications for the Tectonic Evolution of the Paleo-Tethyan Ocean

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The West Qinling Orogen(WQO)is located in the western part of the Qinling Orogen and in the transition zone of Qilian Orogen,Songpan-Garzc Orogen and Yangtze Block,and also the key position of Triassic collision orogenic event.The study of the Early Triassic strata in the WQO is contributed to analyze the closure process of the paleo-Tethys.We conducted LA-ICP-MS U-Pb dating studies on detrital zircons to determine the provenance,depositional age,and tectonic setting of the Early Triassic Longwuhe Formation in the Lintan area of the WQO.The results show that the majori-ty of the detrital zircons in the Longwuhe Formation are mainly magmatic origin and have characteris-tic of crust source zircon.The lowest limit of sedimentation of the Longwuhe Formation is constrained to the Early Triassic,with the youngest detrital zircon age of 253±3 Ma.The ages can be divided into five age groups:3 346-1 636 Ma,with two peak ages of ca.2 495 and ca.1 885 Ma;1 585-1 010 Ma,with a peak age at ca.1 084 Ma;992-554 Ma,with a peak age at ca.939 Ma;521-421 Ma,with a peak age at ca.445 Ma;418-253 Ma,with a peak age at ca.280 Ma.Apparently,the sources of the Long-wuhe Formation include the northern margin of the WQO,the Qilian Orogen(QLO)and the base-ment of the southern margin of the North China Block(NCB),of which the ancient basement of the southern margin of the NCB is the main source area of the Longwuhe Formation.Combined with pre-vious studies,we propose that the Longwuhe Formation was formed in a fore-arc basin,which is relat-ed to the closure of the A'nyemaqen-Mianlüe Ocean from the Early Permian to Early-Middle Triassic due to the northward subduction-collision of the Yangtze Block(YZB).This also indicates that the A'nyemaqen-Mianlüe Ocean has flat subduction characteristics.

West Qinling orogenic beltEarly Triassicpaleo-Tethyan Oceangeochronologyzir-con

Zuochen Li、Xianzhi Pei、Liyong Wei、Guobing Liang、Meng Wang、Ruibao Li、Lei Pei、Chengjun Liu、Youxin Chen、Feng Gao

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Xi'an Key Laboratory for Mineralization and Efficient Utilization of Critical Metals,School of Earth Science and Resources,Chang'an University,Xi'an 710054,China

Xi'an Mineral Resources Survey Center,China Geological Survey,Xi'an 710100,China

School of Geology and Mining Engineering,Xinjiang University,Urumqi 830000,China

National Nature Sciences Foundation of ChinaNational Nature Sciences Foundation of ChinaNational Nature Sciences Foundation of ChinaNational Nature Sciences Foundation of ChinaNational Nature Sciences Foundation of ChinaNational Nature Sciences Foundation of ChinaNational Nature Sciences Foundation of ChinaChina Scholarship CouncilNatural Science Basic Research Plan in Shaanxi Province of ChinaNatural Science Basic Research Plan in Shaanxi Province of ChinaNatural Science Basic Research Plan in Shaanxi Province of ChinaChina Geological SurveyChina Geological SurveyChina Postdoctoral Science FoundationFundamental Research Funds for the Central Universities of ChinaFundamental Research Funds for the Central Universities of ChinaFundamental Research Funds for the Central Universities of ChinaFundamental Research Funds for the Central Universities of ChinaFundamental Research Funds for the Central Universities of ChinaFundamental Research Funds for the Central Universities of ChinaFundamental Research Funds for the Central Universities of China

418722354217223641872233420722674180223441602229415021912018065650262019JM-3122019JQ-0902019JQ-20912120114041201DD20160079012016M592726300102270202300103120009202110710062300103183081300104282717300102279204201810710233

2024

10.1007/s12583-022-1714-1

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(4)
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