Paleomagnetic and Ar-40/Ar-39 geochronological results from the Linzizong Group, Linzhou Basin, Lhasa Terrane, Tibet: Implications to Paleogene paleolatitude and onset of the India-Asia collision

doi:10.1016/j.jseaes.2014.09.007

	Paleomagnetic and Ar-40/Ar-39 geochronological results from the Linzizong Group, Linzhou Basin, Lhasa Terrane, Tibet: Implications to Paleogene paleolatitude and onset of the India-Asia collision
	Chen, Junshan 1,3; Huang, Baochun 2,3; Yi, Zhiyu 3; Yang, Liekun 3; Chen, Liwei 3
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2014-12-15
卷号	96 页码:162-177
关键词	Paleomagnetism Linzizong Group Lhasa Terrane India-Asia collision Tibet
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2014.09.007
文献子类	Article
英文摘要	The Linzizong Group (64-44 Ma) of the Lhasa Terrane in Tibet is critically positioned for establishing the paleoposition of the southern leading edge of the Asian continent during Paleogene times and constraining onset of the India-Asia collision. Here we report paleomagnetic results from a collection comprising 384 drill-core samples from 34 sites embracing all three formations of this group. Comprehensive demagnetization and field tests isolate characteristic remanent magnetizations (ChRM) summarized by overall tilt-corrected formation-mean directions of D = 183.6 degrees, I = -12.4 degrees (alpha(95)= 8.1 degrees) for the Dianzhong (64-60 Ma), D = 1.0 degrees, I = 18.1 degrees (alpha(95) = 8.1 degrees) for the Nianbo (60-50 Ma), and D = 12.4 degrees, I = 23.2 degrees (alpha(95) = 7.3 degrees) for the Pana (50-44 Ma). Fold tests are positive in each formation suggesting a pre-folding origin and we interpret the magnetizations as quasi-primary and acquired at, or slightly later than, formation of the Linzizong Group. Revised Paleogene paleopoles with Ar-Ar age constraints for the Lhasa Terrane indicate that onset of the India-Asia collision occurred no later than similar to 60.5 +/- 1.5 Ma at a low paleolatitude of similar to 10 degrees N. Analysis of 60 site-mean observations from a range of studies of the Pana Formation in the higher part of the succession highlight a large dispersion of ChRM directions; a number of possible causes are suggested but further study of this formation over a wider area is required to resolve this issue. (C) 2014 Elsevier Ltd. All rights reserved.
WOS关键词	GEOMAGNETIC SECULAR VARIATION ; SOUTHERN TIBET ; VOLCANIC-ROCKS ; TECTONIC IMPLICATIONS ; SEDIMENTARY-ROCKS ; FOLD TEST ; CHINA ; BLOCK ; CONSTRAINTS ; EURASIA
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000347023300013
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) ; 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) ; 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) ; 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)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86276]
专题	中国科学院地质与地球物理研究所
通讯作者	Huang, Baochun
作者单位	1.Chinese Acad Sci, Inst South China Sea, Guangzhou 510301, Guangdong, Peoples R China 2.Peking Univ, Sch Earth & Space Sci, Minist Educ, Key Lab Orogen Belt & Crustal Evolut, Beijing 100871, 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	Chen, Junshan,Huang, Baochun,Yi, Zhiyu,et al. Paleomagnetic and Ar-40/Ar-39 geochronological results from the Linzizong Group, Linzhou Basin, Lhasa Terrane, Tibet: Implications to Paleogene paleolatitude and onset of the India-Asia collision[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,96:162-177.
APA	Chen, Junshan,Huang, Baochun,Yi, Zhiyu,Yang, Liekun,&Chen, Liwei.(2014).Paleomagnetic and Ar-40/Ar-39 geochronological results from the Linzizong Group, Linzhou Basin, Lhasa Terrane, Tibet: Implications to Paleogene paleolatitude and onset of the India-Asia collision.JOURNAL OF ASIAN EARTH SCIENCES,96,162-177.
MLA	Chen, Junshan,et al."Paleomagnetic and Ar-40/Ar-39 geochronological results from the Linzizong Group, Linzhou Basin, Lhasa Terrane, Tibet: Implications to Paleogene paleolatitude and onset of the India-Asia collision".JOURNAL OF ASIAN EARTH SCIENCES 96(2014):162-177.