Reconnaissance of pre-collisional paleolatitudes of the southern margin of Eurasia; New paleomagnetic results from Upper Cretaceous red beds in the Linzhou basin, Tibet
文献类型：期刊论文
| 作者 | Liang Ya-Lung1; Huang Bao-Chung1; Yi Zhi-Yu2; Zhang Ye1; Yan Yong-Gang3; Zhang Dong-Hai1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2017-05-01 |
| 卷号 | 60期号:5页码:1811-1824 |
| 关键词 | Lhasa Block Cretaceous Red Beds Inclination Shallowing Syn-folding Remagnetization India-asia Collision |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg20170517 |
| 文献子类 | Article |
| 英文摘要 | Paleomagnetic data of Cretaceous red beds in the Lhasa block remains highly controversial. Possible inclination shallowing is believed to be a critical issue responsible for such a high discrepancy in paleolatitudes deduced from the Shexing Formation (red beds). In this study, characteristic remanent magnetizations (ChRM) have been successfully isolated from 15 sites in both limbs of the Shexing Fm anticline with mean direction of D = 339. 3, I = 22. 9 degrees(alpha 95 = 5. 1 degrees) after tilt -correction with plunging fold axis. However, the ChRM reaches its optimal concentration at similar to 69% unfolding, yielding a mean direction of D = 339.1 degrees, I = 27. 3 degrees (alpha(95)=4. 1 degrees) and a corresponding paleomagnetic pole at 65. 4 degrees N, 327. 5 degrees E (A(95) = 3. 5 degrees). Thin section analysis indicates that the hematites are secondary products, which is consistent with the structural interpretation of anisotropy of magnetic susceptibility (AMS). The ChRM is hence considered to be a syn-folding remagnetization, which is very likely acquired between 72.4 +/- 1. 8 Ma and 64. 4 +/- 0. 6 Ma in the light of geologic setting, when the Lhasa block was located at about 15. 0 degrees N +/- 3. 5 degrees (reference site: 29.3 degrees N, 88. 5 degrees E). The E/I (elongation versus inclination) method indicates that the ChRM was not significantly affected by inclination shallowing. Taking available paleomagnetic data from the western and eastern Lhasa block as well as the seismic tomographic image into account, we believe that the Lhasa block was located at similar to 10 degrees N-15 degrees N with a quasi-linear geometry prior to the India-Asia collision. This result indicates that the collision between India and Eurasia occurred no later than similar to 55 Ma. Compared with the expected paleomagnetic directions from the Eurasia plate, the total latitudinal convergence was accommodated by at least 1200 +/- 400 km (11. 1 degrees +/- 3. 5 degrees) between the Lhasa block and stable Eurasia since similar to 70 Ma. |
| WOS关键词 | INDIA-ASIA COLLISION ; VOLCANIC-ROCKS ; LHASA TERRANE ; TECTONIC IMPLICATIONS ; MAGNETIC-SUSCEPTIBILITY ; CONTINENTAL SUBDUCTION ; SEISMIC TOMOGRAPHY ; FOLD TEST ; BLOCK ; CONSTRAINTS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000400803000017 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/52905]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Huang Bao-Chung |
| 作者单位 | 1.Peking Univ, Sch Earth & Space Sci, Minist Educ, Key Lab Orogen Belt & Crustal Evolut, Beijing 100871, Peoples R China 2.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liang Ya-Lung,Huang Bao-Chung,Yi Zhi-Yu,et al. Reconnaissance of pre-collisional paleolatitudes of the southern margin of Eurasia; New paleomagnetic results from Upper Cretaceous red beds in the Linzhou basin, Tibet[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2017,60(5):1811-1824. |
| APA | Liang Ya-Lung,Huang Bao-Chung,Yi Zhi-Yu,Zhang Ye,Yan Yong-Gang,&Zhang Dong-Hai.(2017).Reconnaissance of pre-collisional paleolatitudes of the southern margin of Eurasia; New paleomagnetic results from Upper Cretaceous red beds in the Linzhou basin, Tibet.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,60(5),1811-1824. |
| MLA | Liang Ya-Lung,et al."Reconnaissance of pre-collisional paleolatitudes of the southern margin of Eurasia; New paleomagnetic results from Upper Cretaceous red beds in the Linzhou basin, Tibet".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 60.5(2017):1811-1824. |
入库方式： OAI收割
来源：地质与地球物理研究所
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