气候变化领域集成服务门户(CCPortal): Paleomagnetism of the Upper Triassic Duoburi Formation sedimentary rocks on the middle Lhasa terrane in the Tibetan Plateau and its tectonic significance

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DOI	10.6038/cjg2023R0079
	Paleomagnetism of the Upper Triassic Duoburi Formation sedimentary rocks on the middle Lhasa terrane in the Tibetan Plateau and its tectonic significance
	Yao Yong; WeiWei, Bian; Shen ZhongShan; Deng ChengLong
发表日期	2023
ISSN	0001-5733
起始页码	5086
结束页码	5106
卷号	66 期号:12
英文摘要	The evolution of the Lhasa terrane during the late Paleozoic to early Cenozoic is critical to understanding the formation and evolution of the Tibetan Plateau. Detailed analyses of paleomagnetism, rock magnetism, and petrography have been carried out on the sedimentary rocks of the Upper Triassic Duoburi Formation in the Xainza area of the central Tibetan Plateau. Rock magnetic results reveal that the dominant carriers of remanence are hematite, hematite and magnetite, and magnetite in red beds, limestones, and grey sandstones, respectively. Petrographic results show that magnetic minerals of red beds, limestones, and grey sandstones are of authigenic origin. A total of 602 specimens from 60 sites were subjected to stepwise thermal demagnetization. The site-mean direction is D-g = 13.9 degrees, I-g = 38.9 degrees ((alpha 95g) = 0. 9 degrees) in situ and D-s =16.7 degrees, I-s = 8.4 degrees ((alpha 95s) = 1.5 degrees) after tilt-correction. The precision parameter (k) has a maximum grouping at 9.9%, which provides the site-mean direction of D = 14.4 degrees, I = 35.9 (k = 389.06, (alpha 95) = 0. 9 degrees) corresponding to a paleopole at 72.9 degrees N, 216.2 degrees E (dp = 0.6 degrees, dm = 1 degrees). This paleopole is similar to the Eocene (54 similar to 47 Ma) paleopole of the Lhasa terrane, indicating that the remagnetization may have occurred during the early Eocene. The combination of our new paleomagnetic data and previously published reliable early Cenozoic paleomagnetic data shows that a latitudinal convergence of 1676 perpendicular to 577 km has taken place between the Lhasa terrane and Eurasia during the period of 56 similar to 44 Ma.
关键词	Lhasa terrane Paleomagnetism Remagnetization Triassic Duoburi Formation
英文关键词	VOLCANIC-ROCKS; RED-BEDS; SOUTHERN TIBET; LINZHOU BASIN; XAINZA AREA; FOLD TEST; U-PB; INDIA; COLLISION; EVOLUTION
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001136989900021
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283864
作者单位	Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; China University of Geosciences - Beijing
推荐引用方式 GB/T 7714	Yao Yong,WeiWei, Bian,Shen ZhongShan,et al. Paleomagnetism of the Upper Triassic Duoburi Formation sedimentary rocks on the middle Lhasa terrane in the Tibetan Plateau and its tectonic significance[J],2023,66(12).
APA	Yao Yong,WeiWei, Bian,Shen ZhongShan,&Deng ChengLong.(2023).Paleomagnetism of the Upper Triassic Duoburi Formation sedimentary rocks on the middle Lhasa terrane in the Tibetan Plateau and its tectonic significance.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,66(12).
MLA	Yao Yong,et al."Paleomagnetism of the Upper Triassic Duoburi Formation sedimentary rocks on the middle Lhasa terrane in the Tibetan Plateau and its tectonic significance".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 66.12(2023).