中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Paleomagnetic results of Cretaceous cherts from Zhongba, southern Tibet: New constraints on the India-Asia collision

文献类型:期刊论文

作者Qin, Shi-Xin1; Li, Yong-Xiang1; Li, Xiang-Hui1; Xu, Bo (许波)2; Luo, Hui (罗辉)2
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2019-04-15
卷号173页码:42-53
关键词Southern Tibet Tethyan Himalaya Cherts Paleomagnetism India-asia Collision Greater India
ISSN号1367-9120
DOI10.1016/j.jseaes.2019.01.012
英文摘要

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.

WOS关键词Himalayan Carbonate Rocks ; Gamba Area Implications ; Inuyama Area ; Lower Plate ; Eurasia Collision ; Tethyan Himalaya ; Greater India ; Bedded Chert ; Remagnetization ; Evolution
资助项目National Natural Science Foundation of China[41774075] ; National Natural Science Foundation of China[41476029] ; National Basic Research Program of China (MOST 973 Project)[2012CB822001]
WOS研究方向Geology
语种英语
WOS记录号WOS:000466059800004
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; National Basic Research Program of China (MOST 973 Project)
源URL[http://ir.nigpas.ac.cn/handle/332004/22323]  
专题中国科学院南京地质古生物研究所
南京地质古生物研究所_其他
通讯作者Li, Yong-Xiang
作者单位1.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
推荐引用方式
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.

入库方式: OAI收割

来源:南京地质古生物研究所

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