| 西藏错鄂湖沉积旋回与古环境变迁 |
| |
| 关键词:Co Ngoin Quaternary period sedimentary cycle environmental evolution Tibetan Plateau |
| 基金项目:国家重点基础研究发展规划项目(编号:G1998040810); 聊城大学科研基金 |
|
| 摘要点击次数: 3455 |
| 全文下载次数: 2494 |
| 摘要: |
| Sedimentary Cycles and Paleoenvironmental Evolution of the Co Ngoin Lake in Tibetan Plateau since Late Cenozoic |
| There are lots of lakes in Tibetan Plateau. Regarded as a relatively independent natural environmental system in the land, the lake is a link of such factors as the atmosphere, the lithosphere, the biosphere, and the land water, and can serve as a mirror of regional environment. The Co Ngoin Lake with thick lacustrine sediments in Naqu area, which is located on the margin of the Indian monsoon, is an enclosed faulted inland lake basin. The sediments make up a prefect record for the study of paleoenvironmental changes. In this paper, the sedimentary cycles of a 200 m-depth core taken from Co Ngoin Basin were analyzed. The sediments reflect ten sedimentary cycles in Core-hole CN. In combination with lithologic properties, grain sizes and pollen assemblages, this paper has discussed the history of paleoenvironment change in the last 2.8 Ma. The sedimentary records indicate that this region has experienced three strong paleoenvironmental evolution stages (2.8～2.5 Ma, 2.5～0.78 Ma, 0.78～0 Ma), namely three tectonic-climatic sedimentary cycles and eight sub-environmental changes processes or eight climatic sedimentary cycles. Studies show that the paleoenvironmental evolution in Co Ngoin catchment was controlled by tectonic movement and climate change. In general, the major environmental changes were largely controlled by stepwise uplift of the Tibetan Plateau, and the small changes overlapped on the large tectonic background were mainly controlled by the climatic changes. |
| CHEN Shi-yue,WANG Su-min,WU Yan-hong.2006.Sedimentary Cycles and Paleoenvironmental Evolution of the Co Ngoin Lake in Tibetan Plateau since Late Cenozoic[J].Acta Geoscientica Sinica,27(4):315-322. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|