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Paleomagnetic and geochronological results of the Risong Formation in the western Lhasa Terrane: Insights into the Lhasa-Qiangtang collision and stratal age
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; Li, Haiyan1; Cao, Liwan1
2022-01-15
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume586Pages:19
AbstractTo 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.
KeywordBangong-Nujiang suture zone Meso-Tethyan evolution Zircon U-Pb geochronology Inclination discrepancy
DOI10.1016/j.palaeo.2021.110778
Funding OrganizationNational 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
WOS KeywordCRETACEOUS VOLCANIC-ROCKS ; NUJIANG SUTURE ZONE ; ZIRCON U-PB ; SOUTHERN MARGIN ; RED-BEDS ; TECTONIC EVOLUTION ; TIBET IMPLICATIONS ; FOLD TEST ; SYNTECTONIC-SEDIMENTATION ; PROVENANCE ANALYSIS
Language英语
Funding ProjectNational 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]
Funding OrganizationNational 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
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000813033900009
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105883
Collection岩石圈演化国家重点实验室
Corresponding AuthorYang, Tianshui
Affiliation1.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
Recommended Citation
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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