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Paleomagnetic constraints on the paleolatitude of the Lhasa block during the Early Cretaceous: Implications for the onset of India-Asia collision and latitudinal shortening estimates across Tibet and stable Asia
Li, ZY (Li, Zhenyu)1; Ding, L (Ding, Lin)1,2; Song, PP (Song, Peiping)1; Fu, JJ (Fu, Jiajun)1; Yue, YH (Yue, Yahui)1; Li, ZY
Source PublicationGONDWANA RESEARCH
2017
Volume41Issue:0Pages:352-372
DOI10.1016/j.gr.2015.05.013
AbstractInterbedded volcano-sedimentary sequences are well exposed in the northern part of the Lhasa block in southern Tibet. Zircon U-Pb dating results from two samples indicate that the emplacement age of the Duoni Formation volcanic flows is 120.2 +/- 0.5 Ma. Paleomagnetic results from 235 progressively demagnetized volcanic rock samples (25 sites) and 41 sandstone samples (5 sites) indicate that the dominant remanence carriers are Ti-poor titanomagnetite and Ti-poor titanohematite in the volcanic samples and Ti-rich titanomagnetite in the sandstone samples. Rock magnetic investigations, systematic demagnetization behavior, positive fold test results, and direct petrographic identifications all indicate that the paleodirections recorded by the chemically stable magnetic particles are primary thermal remanent magnetization in the volcanic flows and primary detrital remanent magnetization in the sandstones. The tilt-corrected ChRM mean direction is D/I = 356.4 degrees/16.4 degrees with alpha(95) = 6.3 degrees (N = 19), corresponding to a paleopole position of lambda(p) = 66.9 degrees N, phi(p) = 281.2 degrees E with A(95) = 6.1 degrees. Combined with previously published results, the geochronological dating and paleomagnetic analysis indicate a paleolatitude of 13.1 +/- 2.7 degrees N for the southern margin of the Lhasa block during the Early Cretaceous. Therefore, the southernmost margin of the Eurasian continent likely remained at the low-middle paleolatitude of 13.1 +/- 2.7 degrees N between the Early Cretaceous and the Paleocene. Based on comparisons to results from the Tethyan-Himalayan block and the reference poles from stable India and Eurasia, the low-middle paleoposition of the Lhasa block during the Early Cretaceous through Early Paleocene suggests that the initial contact between India and Asia occurred at ca. 59.3 Ma. Under the assumption of a rigid Eurasian plate, this timing implies that a total collision-related latitudinal convergence of 1450 +/- 400 km (13.1 +/- 3.7 degrees N) has been accommodated by folding, thrust faulting, normal faulting, crustal thickening, intracontinental subduction in Tibet and central Asia and southeastward continental extrusion of the Indo-China block from the eastern syntaxis between the Lhasa block and stable Asia. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
Subject Area地质学
WOS IDWOS:000397873300023
Language英语
Indexed BySCI
KeywordZIRCON U-PB CENOZOIC TECTONIC EVOLUTION FORELAND BASIN EVOLUTION SOUTHERN TIBET VOLCANIC-ROCKS CONTINENTAL COLLISION LINZHOU BASIN STRUCTURAL EVOLUTION SILICICLASTIC ROCKS SEDIMENTARY-ROCKS
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary ; Geology
Cooperation Status国内
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8390
Collection图书馆
Corresponding AuthorLi, ZY
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China.
2.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.
Recommended Citation
GB/T 7714
Li, ZY ,Ding, L ,Song, PP ,et al. Paleomagnetic constraints on the paleolatitude of the Lhasa block during the Early Cretaceous: Implications for the onset of India-Asia collision and latitudinal shortening estimates across Tibet and stable Asia[J]. GONDWANA RESEARCH,2017,41(0):352-372.
APA Li, ZY ,Ding, L ,Song, PP ,Fu, JJ ,Yue, YH ,&Li, ZY.(2017).Paleomagnetic constraints on the paleolatitude of the Lhasa block during the Early Cretaceous: Implications for the onset of India-Asia collision and latitudinal shortening estimates across Tibet and stable Asia.GONDWANA RESEARCH,41(0),352-372.
MLA Li, ZY ,et al."Paleomagnetic constraints on the paleolatitude of the Lhasa block during the Early Cretaceous: Implications for the onset of India-Asia collision and latitudinal shortening estimates across Tibet and stable Asia".GONDWANA RESEARCH 41.0(2017):352-372.
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