Paleomagnetism and Ar-Ar geochronology of Cretaceous volcanic rocks in the middle Lhasa terrane, China and tectonic implications
文献类型：期刊论文
| 作者 | Tang Xiang-De1,2; Huang Bao-Chun1; Yang Lie-Kun1; Yi Zhi-Yu1; Qiao Qing-Qing1; Chen Li-Wei1,2 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2013 |
| 卷号 | 56期号:1页码:136-149 |
| 关键词 | Linzizong Group Lhasa terrane Late Cretaceous Paleomagnetism Ar-Ar dating |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg20130114 |
| 文献子类 | Article |
| 英文摘要 | In order to better understand Cretaceous to Paleogene paleogeography of the Lhasa terrane, 180 drill core samples at 18 sites were collected from Linzizong volcanic rocks near the Coqen town in the middle Lhasa terrane for paleomagnetic studies. Detailed rock magnetic analyses reveal fine-grained ferrimagnetic magnetite as remanence carrier, whilst stepwise thermal and alternating field demagnetizations isolate a high temperature or high field characteristic remanent magnetization (ChRM) from the majority of the sampled rocks. We interpret this characteristic remanence as primary one in the light of a positive fold test result. The ChRM has a tilt-corrected site-mean direction of D=16.2 degrees, I=17.7 degrees with alpha(95)=5.6 degrees, and a corresponding paleopole at 63.1 degrees N, 224.6 degrees E with A(95) = 5.1 degrees. On the other hand, the Ar-Ar dating on three rock samples show that the collected Linzizong volcanic rocks have a geochronological age ranging from similar to 99 to 93 Ma, which is much older than those outcropped in the Linzhou Basin, eastern part of the Lhasa terrane. Then both geochronological and paleomagnetic results reported here indicate a paleolatitude of 8.5 degrees +/- 6.9 degrees N in the Northern Hemisphere for the middle part of the Lhasa terrane during the Late Cretaceous, which is well compatible with those estimated from the Early Paleogene Dianzhong and Nianbo formations in the Linzhou Basin, further indicating that the southernmost margin of the Eurasian continent might have a low paleolatitude of similar to 10 degrees N in the Northern Hemisphere during the Late Cretaceous and Paleocene times. Together with recently published paleomagnetic results for the Paleocene Tethyan Himalayan marine sediments, the low paleolatitudes for Late Cretaceous and,Paleocene Lhasa terrane support the view that the initial contact between India and Asia should be no later than similar to 60.5 Ma. In addition, our results indicate also that at least similar to 1900 km collision-induced crustal shortening should have occurred between the Lhasa terrene and Siberia given that the Eurasian continent behaves as a single rigid plate during the Cenozoic. |
| WOS关键词 | INDIA-ASIA COLLISION ; SOUTHERN TIBET ; REMAGNETIZATION CIRCLES ; FOLD TEST ; CONSTRAINTS ; EVOLUTION ; AGE ; BLOCK ; HIMALAYAN ; INITIATION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000314480100014 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/88082]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Tang Xiang-De |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang Xiang-De,Huang Bao-Chun,Yang Lie-Kun,et al. Paleomagnetism and Ar-Ar geochronology of Cretaceous volcanic rocks in the middle Lhasa terrane, China and tectonic implications[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2013,56(1):136-149. |
| APA | Tang Xiang-De,Huang Bao-Chun,Yang Lie-Kun,Yi Zhi-Yu,Qiao Qing-Qing,&Chen Li-Wei.(2013).Paleomagnetism and Ar-Ar geochronology of Cretaceous volcanic rocks in the middle Lhasa terrane, China and tectonic implications.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,56(1),136-149. |
| MLA | Tang Xiang-De,et al."Paleomagnetism and Ar-Ar geochronology of Cretaceous volcanic rocks in the middle Lhasa terrane, China and tectonic implications".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 56.1(2013):136-149. |
入库方式： OAI收割
来源：地质与地球物理研究所
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