Eocene Neotethyan slab breakoff in southern Tibet inferred from the Linzizong volcanic record
文献类型：期刊论文
| 作者 | Lee, Hao-Yang1; Chung, Sun-Lin1; Lo, Ching-Hua1; Ji, Jianqing2; Lee, Tung-Yi3; Qian, Qing4; Zhang, Qi4 |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2009-11-01 |
| 卷号 | 477期号:1-2页码:20-35 |
| 关键词 | Linzizong volcanism Tibet Neotethyan subduction Slab breakoff India-Asia collision |
| ISSN号 | 0040-1951 |
| DOI | 10.1016/j.tecto.2009.02.031 |
| 文献子类 | Article |
| 英文摘要 | Formation of the Linzizong volcanic successions in the Lhasa terrane, southern Tibet has long been related to northward subduction of the Neotethyan oceanic slab under Asia. Here we report new (40)Ar/(39)Ar age results for the volcanic rocks recovered from a large area (29 degrees N to 32 degrees N and 85 degrees E to 93 degrees E) that, together with literature data, delineate two discrete stages of volcanism. These are a widespread Cretaceous stage and an intense, but spatially confined, Paleogene stage. The latter, occurring only in the southern part of the Lhasa terrane, resulted in the Linzizong volcanic successions. Our data, furthermore, suggest southward migration and intensification of the volcanism in the Lhasa terrane with magmatic "flare-ups" at ca. 50 Ma. While the volcanic successions consist dominantly of calc-alkaline rocks typical of arc lava geochemistry, those formed during the flare-up period show significant compositional variations from low-K tholeiitic through calc-alkaline to shoshonitic magma suites. These observations enable us to interpret the volcanic southward migration and following flare-ups as the consequences of rollback and breakoff of the subducted Neotethyan slab that occurred ahead and in the early stage, respectively. of the India-Asia collision. Our interpretation that involves a major Eocene tectonomagmatic activity, and concomitant topographic uplift, in southern Tibet is consistent with Himalayan metamorphic constraints, regional sedimentary records and seismic tomography. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved. |
| WOS关键词 | INDO-ASIAN COLLISION ; TECTONIC EVOLUTION ; POSTCOLLISIONAL MAGMATISM ; CONTINENTAL COLLISION ; CALC-ALKALINE ; SW TIBET ; SUBDUCTION ; BASIN ; DETACHMENT ; PLATEAU |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000271776600003 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/71638]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Lee, Hao-Yang |
| 作者单位 | 1.Natl Taiwan Univ, Dept Geosci, Taipei 10617, Taiwan 2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 3.Natl Taiwan Normal Univ, Dept Earth Sci, Taipei, Taiwan 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lee, Hao-Yang,Chung, Sun-Lin,Lo, Ching-Hua,et al. Eocene Neotethyan slab breakoff in southern Tibet inferred from the Linzizong volcanic record[J]. TECTONOPHYSICS,2009,477(1-2):20-35. |
| APA | Lee, Hao-Yang.,Chung, Sun-Lin.,Lo, Ching-Hua.,Ji, Jianqing.,Lee, Tung-Yi.,...&Zhang, Qi.(2009).Eocene Neotethyan slab breakoff in southern Tibet inferred from the Linzizong volcanic record.TECTONOPHYSICS,477(1-2),20-35. |
| MLA | Lee, Hao-Yang,et al."Eocene Neotethyan slab breakoff in southern Tibet inferred from the Linzizong volcanic record".TECTONOPHYSICS 477.1-2(2009):20-35. |
入库方式： OAI收割
来源：地质与地球物理研究所
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