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Paleomagnetic results of Cretaceous cherts from Zhongba, southern Tibet: New constraints on the India-Asia collision
Qin, Shi-Xin1; Li, Yong-Xiang1; Li, Xiang-Hui1; Xu, Bo (许波)2; Luo, Hui (罗辉)2
2019-04-15
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume173Pages:42-53
Abstract

An oceanic Greater Indian Basin was hypothesized to have formed between similar to 120 Ma and similar to 65 Ma by regional extension that separated the cratonic India from its northern margin of Tethyan Himalaya (TH). However, the lack of paleomagnetic data from this critical time interval in the TH marks an important gap in our knowledge about the tectonic evolution of the Greater India. We have conducted a paleomagnetic study of a Cretaceous marine succession in Zhongba, southern Tibet that consists of predominantly purple reddish cherts and siliceous limestone. Paleomagnetic samples from 12 sites were subjected to stepwise thermal demagnetization that revealed either two- or three-component magnetizations with the high-temperature component (HTC) typically unblocked at similar to 650 degrees C. The HTCs exhibit dual polarities that yield a positive reversed test at 95% confidence level, suggesting a primary origin of the remanence. With chronologic constraints from the combined analysis of the magnetostratigraphic and radiolarian data, the HTCs yield a mean of D-s = 336.9 degrees, I-s = - 50.7 degrees, k, = 18.0, alpha(95) = 5.3 degrees for the similar to 120.8-93.9 Ma interval of the TH, which corresponds to a paleopole at 25.0 degrees N, 285.7 degrees E (dp/dm = 4.8/7.1 degrees). The apparent polar wander path (APWP) of the TH overall resembles that of cratonic India, suggesting no polarward separation that is sufficiently large to merit an oceanic basin between the TH and cratonic India. Therefore, our new reliable paleomagnetic data from the critical time interval do not support the Greater Indian Basin hypothesis and its implied dual collisional processes between India and Asia. On the other hand, the APWPs exhibit relative shifts for the post-120 Ma segment and the pre-130 Ma segment, indicating relative motions between the TH and cratonic India that most likely resulted from shearing along boundaryparallel faults during the India-Asia collision.

KeywordSouthern Tibet Tethyan Himalaya Cherts Paleomagnetism India-asia Collision Greater India
DOI10.1016/j.jseaes.2019.01.012
Language英语
WOS KeywordHimalayan Carbonate Rocks ; Gamba Area Implications ; Inuyama Area ; Lower Plate ; Eurasia Collision ; Tethyan Himalaya ; Greater India ; Bedded Chert ; Remagnetization ; Evolution
Funding ProjectNational Natural Science Foundation of China[41774075] ; National Natural Science Foundation of China[41476029] ; National Basic Research Program of China (MOST 973 Project)[2012CB822001]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000466059800004
Funding OrganizationNational Natural Science Foundation of China ; National Basic Research Program of China (MOST 973 Project)
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/22324
Collection中国科学院南京地质古生物研究所
Corresponding AuthorLi, Yong-Xiang
Affiliation1.Nanjing Univ, Inst Geophys & Geodynam, State Key Lab Mineral Deposits Res, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Econ Stratig & Palaeogeog, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Qin, Shi-Xin,Li, Yong-Xiang,Li, Xiang-Hui,et al. Paleomagnetic results of Cretaceous cherts from Zhongba, southern Tibet: New constraints on the India-Asia collision[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,173:42-53.
APA Qin, Shi-Xin,Li, Yong-Xiang,Li, Xiang-Hui,Xu, Bo ,&Luo, Hui .(2019).Paleomagnetic results of Cretaceous cherts from Zhongba, southern Tibet: New constraints on the India-Asia collision.JOURNAL OF ASIAN EARTH SCIENCES,173,42-53.
MLA Qin, Shi-Xin,et al."Paleomagnetic results of Cretaceous cherts from Zhongba, southern Tibet: New constraints on the India-Asia collision".JOURNAL OF ASIAN EARTH SCIENCES 173(2019):42-53.
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