| 祁连山新生代古海拔变化的碳氧同位素记录 |
| |
| 关键词:carbon and oxygen isotopes paleoelevation Cenozoic Qilian Mountain |
| 基金项目:中国地质调查局天然气水合物资源勘查与试采工程国家专项“祁连山冻土区天然气水合物资源勘查(力学所)”(编号: GZHL20120301) |
|
| 摘要点击次数: 5532 |
| 全文下载次数: 3938 |
| 摘要: |
| Paleoelevation of the Qilian Mountain Inferred from Carbon and Oxygen Isotopes of Cenozoic Strata |
| Located at the northeast edge of the Tibetan Plateau, the Qilian Mountain is a key region where the whole Plateau expands to the interior of the continent, and hence the paleoelevation estimated by paleo-altimetry based on carbon and oxygen isotopes of Cenozoic strata is of great significance for understanding the uplift of the Tibetan Plateau. In this paper, such a paleo-altimetry was used to calculate the paleo-annual temperature and paleo-elevation of middle Qilian Mountain based on carbon and oxygen isotopes of Cenozoic sediments formed in the Eocene, Oligocene, Miocene and Mid-late Pleistocene. The results show that the Qilian Mountain was uplifted to 2711 m in Paleogene, to ~2848 m in the early Miocene, to ~3586 m in the mid-late Miocene, and to 3790~3890 m in the Middle-late Pleistocene. The paleo-elevation of the Qilian Mountain in Paleogene was not very high, but had already formed the northeastern margin of the Tibetan Plateau. The Qilian Mountain was uplifted considerably in Mid-late Miocene, forming basins-mountains tectonic landforms. In Quaternary the earth crust of the Qilian Mountain was activated again and uplifted intermittently. The paleoelevation of the Qilian Mountain inferred from carbon and oxygen isotopes of Cenozoic strata provides a reference for better understanding of the uplifting process of the Tibetan Plateau. |
| QI Bang-shen,HU Dao-gong,YANG Xiao-xiao,ZHANG Xu-jiao,ZHAO Xi-tao.2015.Paleoelevation of the Qilian Mountain Inferred from Carbon and Oxygen Isotopes of Cenozoic Strata[J].Acta Geoscientica Sinica,36(3):323-332. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|