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| DOI | 10.1016/j.epsl.2012.11.058 |
| Paleogene high elevations in the Qiangtang Terrane, central Tibetan Plateau | |
| Xu, Qiang; Ding, Lin; Zhang, Liyun; Cai, Fulong; Lai, Qingzhou; Yang, Di; Jing Liu-Zeng | |
| 通讯作者 | Xu, Q (通讯作者) |
| 发表日期 | 2013 |
| ISSN | 0012-821X |
| EISSN | 1385-013X |
| 起始页码 | 31 |
| 结束页码 | 42 |
| 卷号 | 362 |
| 英文摘要 | The timing of uplift of the Tibetan Plateau remains controversial, with estimates varying from Eocene to more recent than Pliocene. In particular, the paleoaltimetry of the Qiangtang terrane, on the central Tibetan Plateau, is completely unknown. Here, we present new stable isotope results of fluvial/ lacustrine carbonate cement, pedogenic carbonate and marl from the Kangtuo and Suonahu formations deposited between similar to 51 and similar to 28 Ma in the Heihuling-Bamaoqiongzong area of the northern Qiangtang terrane. The lithofacies associations indicate that the Kangtuo formation was deposited in alluvial fan and fluvial floodplain environments, and the Suonahu formation was deposited in near shore lacustrine, playa-lake and channelized fluvial environments. Carbon and oxygen isotope values, coupled with the sedimentary fades interpretations, point to evaporation and low respiration rates in the Eocene-Oligocene paleosols, suggesting an arid climate in the high Qiangtang area at the time. The delta O-18(psw) values of paleo-surface water reconstructed from the lowest (i.e. the least evaporated) delta O-18(c) (PDB) values of the unaltered authigenic carbonates are used to make the minimum estimates of the average paleoelevation of the drainage basin. The paleoelevation of the northern Qiangtang terrane is reconstructed as above 5000 m by at least the middle Oligocene (28 Ma), similar to the present elevation in this area. The aridity and the positive shift in oxygen isotope values of surface waters in our study area may suggest that the high Lhasa terrane established by the middle Oligocene blocked the northward transport of tropical moisture. Maintenance of high elevation (> 5000 m) from at least the Oligocene to the present suggests that the Qiangtang crust was already thickened by that time, and that underthrusting of India beneath Asia since then has continued to provide additional material while at the same time driving Asian lower crust eastward by crustal flow. (C) 2012 Elsevier B.V. All rights reserved. |
| 关键词 | ISOTOPE-BASED PALEOALTIMETRYHOH XIL BASINSTABLE-ISOTOPETECTONIC EVOLUTIONPALAEO-ALTIMETRYSOUTHERN TIBETCLIMATE-CHANGEEARTH-SCIENCELATE MIOCENEUPLIFT |
| 英文关键词 | carbon and oxygen isotopes; paleoelevation; Qiangtang; Tibetan Plateau |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000315752900004 |
| 来源期刊 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/258169 |
| 推荐引用方式 GB/T 7714 | Xu, Qiang,Ding, Lin,Zhang, Liyun,et al. Paleogene high elevations in the Qiangtang Terrane, central Tibetan Plateau[J]. 中国科学院青藏高原研究所,2013,362. |
| APA | Xu, Qiang.,Ding, Lin.,Zhang, Liyun.,Cai, Fulong.,Lai, Qingzhou.,...&Jing Liu-Zeng.(2013).Paleogene high elevations in the Qiangtang Terrane, central Tibetan Plateau.EARTH AND PLANETARY SCIENCE LETTERS,362. |
| MLA | Xu, Qiang,et al."Paleogene high elevations in the Qiangtang Terrane, central Tibetan Plateau".EARTH AND PLANETARY SCIENCE LETTERS 362(2013). |
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