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  4. 岩石圈演化国家重点实验室
Paleomagnetic and geochronological results of the Risong Formation in the western Lhasa Terrane: Insights into the Lhasa-Qiangtang collision and stratal age

文献类型：期刊论文

作者Wang, Suo1,2; Yang, Tianshui1,2; Gao, Feng1,2; Bian, Weiwei1,2,3; Jin, Jingjie1,2; Peng, Wenxiao1,2; Jiao, Xianwei1,2; Ma, Jiahui1,2; Zhang, Shihong1,2; Wu, Huaichun1
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2022-01-15
卷号586页码:19
ISSN号0031-0182
关键词Bangong-Nujiang suture zone Meso-Tethyan evolution Zircon U-Pb geochronology Inclination discrepancy
DOI10.1016/j.palaeo.2021.110778
英文摘要To constrain the Lhasa-Qiangtang collisional age, a combined paleomagnetic and geochronologic investigation has been performed on the Risong Formation redbeds and volcanic rocks in the Wuma area of the western Lhasa terrane (LT). A U-Pb dating result from the volcanic interlayer at the bottom of the Risong Formation redbeds yields the youngest weighted mean Pb-206/U-238 age of 110.6 +/- 1.3 Ma, and the two detrital zircon U-Pb chronological results from the Risong Formation redbeds provide the youngest weighted mean Pb-206/U-238 age of 106.9 +/- 3.3 Ma (the top strata of section A) and 120.5 +/- 3.0 Ma (the top strata of section D), respectively. Our new geochronological results suggest that the studied Risong Formation redbeds formed during the Early Cretaceous, rather than during the Late Jurassic as assigned by 1:250,000 scale Wuma regional geological survey report. Characteristic remanent magnetization (ChRM) directions from two different limbs of folds concentrate in two different groups, and both site-mean directions pass positive fold tests. One group including 32 sites yields a tilt-corrected site-mean direction that is D = 356.1 degrees, I = 33.1 degrees with alpha(95) = 2.3., corresponding to a paleopole at 75.2 degrees N, 278.1 degrees E with dp/dm = 1.5 degrees /2.6 degrees and a paleolatitude of 18.1 degrees +/- 1.5 degrees N for the study area (32.41 degrees N, 83.39 degrees E). The other group including 24 sites provides a tilt-corrected site-mean direction that is D = 60.5 degrees, I = 48.5 degrees with alpha(95) = 2.0 degrees, corresponding to a paleopole at 38.7 degrees N, 159.6 degrees E with dp/dm = 1.7 degrees/2.6 degrees and a paleolatitude of 29.5 degrees +/- 1.7 degrees N for the study area (32.41 degrees N, 83.39 degrees E). After syntectonic-sedimentation-correction, the Fisherian site-mean inclination of 41.7 degrees +/- 1.6 degrees and corresponding paleolatitude of 24.0 degrees +/- 1.2 degrees N obtained from 56 sites of two different limbs are consistent with the inclination-only mean of 39.6 +/- 3.1 degrees and corresponding paleolatitude of 22.5. +/- 2.2 degrees N deduced from the ChRM directions of all the 56 paleomagnetic sites, suggesting that the observed inclination discrepancy of the Risong Formation redbeds may result from the syntectonic sedimentation. Comparing the Early Cretaceous paleolatitudes observed from the western LT with those from the western Qiangtang terrane shows insignificant paleolatitude difference, supporting that the Lhasa-Qiangtang collision in the western part occurred at or before the Early Cretaceous.
WOS关键词CRETACEOUS VOLCANIC-ROCKS ; NUJIANG SUTURE ZONE ; ZIRCON U-PB ; SOUTHERN MARGIN ; RED-BEDS ; TECTONIC EVOLUTION ; TIBET IMPLICATIONS ; FOLD TEST ; SYNTECTONIC-SEDIMENTATION ; PROVENANCE ANALYSIS
资助项目National Natural Science Foundation of China[42072257] ; National Natural Science Foundation of China[41830215] ; Fundamental Research Funds for the Central Universities[2652019198] ; Fundamental Research Funds for the Central Universities[2652019199] ; Chinese "111" Project[B20011]
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
出版者ELSEVIER
WOS记录号WOS:000813033900009
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Chinese "111" Project ; Chinese "111" Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Chinese "111" Project ; Chinese "111" Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Chinese "111" Project ; Chinese "111" Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Chinese "111" Project ; Chinese "111" Project
源URL[http://ir.iggcas.ac.cn/handle/132A11/105883]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Yang, Tianshui
作者单位1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Suo,Yang, Tianshui,Gao, Feng,et al. Paleomagnetic and geochronological results of the Risong Formation in the western Lhasa Terrane: Insights into the Lhasa-Qiangtang collision and stratal age[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2022,586:19.
APA Wang, Suo.,Yang, Tianshui.,Gao, Feng.,Bian, Weiwei.,Jin, Jingjie.,...&Cao, Liwan.(2022).Paleomagnetic and geochronological results of the Risong Formation in the western Lhasa Terrane: Insights into the Lhasa-Qiangtang collision and stratal age.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,586,19.
MLA Wang, Suo,et al."Paleomagnetic and geochronological results of the Risong Formation in the western Lhasa Terrane: Insights into the Lhasa-Qiangtang collision and stratal age".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 586(2022):19.

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来源：地质与地球物理研究所

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