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A quasi-linear structure of the southern margin of Eurasia prior to the India-Asia collision: First paleomagnetic constraints from Upper Cretaceous volcanic rocks near the western syntaxis of Tibet

文献类型：期刊论文

作者Yi, Zhiyu1,2; Huang, Baochun2,3; Yang, Liekun2; Tang, Xiangde2; Yan, Yonggang2; Qiao, Qingqing2,4; Zhao, Jie2; Chen, Liwei2
刊名TECTONICS
出版日期2015-07-01
卷号34期号:7页码:1431-1451
关键词India-Asia collision southern Tibet Late Cretaceous paleomagnetism Lhasa Terrane
DOI10.1002/2014TC003571
文献子类Article
英文摘要We report the first combined geochronologic and paleomagnetic study of volcanic rocks from the Shiquanhe and Yare Basins at the westernmost Lhasa Terrane, which aims to provide an accurate constraint on the shape and paleoposition of the southern margin of Asia prior to the India-Asia collision. Three new Ar-40/Ar-39 ages of 92.52.9Ma, 92.40.9Ma, and 79.60.7Ma determined by fresh matrix or feldspar from lava flows suggest a Late Cretaceous age for the investigated units. Characteristic remanent magnetizations have been successfully isolated from 38 sites which pass positive fold and/or reversal, conglomerate tests and are hence interpreted as primary in origin. The two paleopoles obtained from Yare and Shiquanhe yield consistent paleolatitudes of 13.6 degrees N9.6 degrees N and 14.2 degrees N +/- 2.7 degrees N, respectively (for a reference site of 31.5 degrees N, 80 degrees E), indicating that the southern margin of Asia near the western syntaxis was located far south during the Late Cretaceous time. A reconstruction of the Lhasa Terrane in the frame of Eurasia with paleomagnetic data obtained from its western and eastern parts indicates that the southern margin of Eurasia probably had a quasi-linear orientation prior to the collision formerly trending approximately 315 degrees E. This is compatible with the shape of the Neo-Tethys slab observed from seismic tomographic studies. Our findings provide a solid basis for evaluating Cenozoic crustal shortening in the Asian interior and the size of Greater India near the western syntaxis.
WOS关键词GEOMAGNETIC SECULAR VARIATION ; TECTONIC IMPLICATIONS ; LINZHOU BASIN ; LHASA TERRANE ; FOLD TEST ; CONTINENTAL SUBDUCTION ; POLAR WANDER ; PLATEAU ; CHINA ; GEOCHRONOLOGY
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000359812200005
资助机构Chinese Academy of Sciences(XDB0310104) ; Chinese Academy of Sciences(XDB0310104) ; Chinese Academy of Sciences(XDB0310104) ; Chinese Academy of Sciences(XDB0310104) ; National Natural Science Foundation of China(41072156 ; National Natural Science Foundation of China(41072156 ; National Natural Science Foundation of China(41072156 ; National Natural Science Foundation of China(41072156 ; State Key Laboratory of Continental Tectonics and Dynamics ; State Key Laboratory of Continental Tectonics and Dynamics ; State Key Laboratory of Continental Tectonics and Dynamics ; State Key Laboratory of Continental Tectonics and Dynamics ; 41202152) ; 41202152) ; 41202152) ; 41202152) ; Chinese Academy of Sciences(XDB0310104) ; Chinese Academy of Sciences(XDB0310104) ; Chinese Academy of Sciences(XDB0310104) ; Chinese Academy of Sciences(XDB0310104) ; National Natural Science Foundation of China(41072156 ; National Natural Science Foundation of China(41072156 ; National Natural Science Foundation of China(41072156 ; National Natural Science Foundation of China(41072156 ; State Key Laboratory of Continental Tectonics and Dynamics ; State Key Laboratory of Continental Tectonics and Dynamics ; State Key Laboratory of Continental Tectonics and Dynamics ; State Key Laboratory of Continental Tectonics and Dynamics ; 41202152) ; 41202152) ; 41202152) ; 41202152)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62290]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位1.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
3.Peking Univ, Minist Educ, Sch Earth & Space Sci, Key Lab Orogen Belt & Crust Evolut, Beijing 100871, Peoples R China
4.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi, Peoples R China
推荐引用方式
GB/T 7714		 Yi, Zhiyu,Huang, Baochun,Yang, Liekun,et al. A quasi-linear structure of the southern margin of Eurasia prior to the India-Asia collision: First paleomagnetic constraints from Upper Cretaceous volcanic rocks near the western syntaxis of Tibet[J]. TECTONICS,2015,34(7):1431-1451.
APA Yi, Zhiyu.,Huang, Baochun.,Yang, Liekun.,Tang, Xiangde.,Yan, Yonggang.,...&Chen, Liwei.(2015).A quasi-linear structure of the southern margin of Eurasia prior to the India-Asia collision: First paleomagnetic constraints from Upper Cretaceous volcanic rocks near the western syntaxis of Tibet.TECTONICS,34(7),1431-1451.
MLA Yi, Zhiyu,et al."A quasi-linear structure of the southern margin of Eurasia prior to the India-Asia collision: First paleomagnetic constraints from Upper Cretaceous volcanic rocks near the western syntaxis of Tibet".TECTONICS 34.7(2015):1431-1451.

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来源：地质与地球物理研究所

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