Cretaceous-Tertiary structural evolution of the north central Lhasa terrane, Tibet
文献类型：期刊论文
| 作者 | Volkmer, John E.; Kapp, Paul; Guynn, Jerome H.; Lai, Qingzhou |
| 刊名 | TECTONICS
 |
| 出版日期 | 2007-11-30 |
| 卷号 | 26期号:6 |
| ISSN号 | 0278-7407 |
| DOI | 10.1029/2005TC001832 |
| 文献子类 | Article |
| 英文摘要 | In the north central Lhasa terrane of Tibet, two distinct structural levels of an east-west striking thrust system are exposed along the north trending late Cenozoic Xiagangjiang rift. Upper Paleozoic strata deformed by the south directed Langgadong La thrust, and Cretaceous strata involved in variably north and south directed thrusting characterize these lower and upper structural levels, respectively. These two structural levels are separated by the Tagua Ri passive roof thrust. Balanced cross section restoration suggests that the thrust system accommodated similar to 103 km (similar to 53%) shortening. The (40)Ar/(39) Ar results, together with an interpretation of synthrust deposition of Upper Cretaceous strata, suggest that the majority of shortening occurred during the Late Cretaceous-Paleocene. Cretaceous strata lie unconformable on Permian rocks; volcanic tuffs directly above the unconformity yield U-Pb zircon ages of similar to 131 Ma. Upper Cretaceous strata record a change from shallow marine to nonmarine deposition, indicating uplift above sea level during this time. The overall south directed vergence of the thrust belt is consistent with substantial crustal thickening in central Tibet by large-scale northward underthrusting of Lhasa terrane basement beneath the Qiantang terrane prior to the Indo-Asian collision. The documented decoupling of contractional deformation at shallow crustal levels appears to be a regional characteristic of Tibet from at least the Bangong suture in the north to the Tethyan Himalaya to the south. This style of deformation explains the absence of basement exposures and major denudation in this region despite substantial crustal shortening. |
| WOS关键词 | INDO-ASIAN COLLISION ; EAST-WEST EXTENSION ; NUJIANG SUTURE ZONE ; SOUTHERN TIBET ; TECTONIC EVOLUTION ; VOLCANIC-ROCKS ; GEODYNAMIC SIGNIFICANCE ; DONQIAO OPHIOLITE ; PLATEAU ; GEOTRAVERSE |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000251350000001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/68280]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Volkmer, John E. |
| 作者单位 | 1.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA 2.Chinese Acad Sci, Geophys & Tibetan Plateu Res, Inst Geol, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Volkmer, John E.,Kapp, Paul,Guynn, Jerome H.,et al. Cretaceous-Tertiary structural evolution of the north central Lhasa terrane, Tibet[J]. TECTONICS,2007,26(6). |
| APA | Volkmer, John E.,Kapp, Paul,Guynn, Jerome H.,&Lai, Qingzhou.(2007).Cretaceous-Tertiary structural evolution of the north central Lhasa terrane, Tibet.TECTONICS,26(6). |
| MLA | Volkmer, John E.,et al."Cretaceous-Tertiary structural evolution of the north central Lhasa terrane, Tibet".TECTONICS 26.6(2007). |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。