Late Quaternary Uplift of the Northwestern Tibetan Plateau: Evidences from River Terraces in the Ashikule Area, West Kunlun Mountain
详细信息
- 责任者：Pan Jiawei (State Key Laboratory of Continental Tectonics and Dynamics ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Li Haibing
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(6)
- 关键词：隆起 ; uplifts ; 河流阶地 ; river terraces ; 昆仑山 ; Kunlun Mountains
- 页码：p.2199-2210
- 图表：illus., 1 table, 62 refs.
- 分类号：0300
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Uplift of the Qinghai-Tibet Plateau is the most spectacular Cenozoic geological event. Study on the uplift of the Qinghai-Tibet Plateau has been the focus of geologists. River terraces record awealth of information about tectonic movement and climate change,and have been widely applied in tectonic movement and climate change study in recent years. However,previously studied river terraces basically distributed in the periphery of the Tibetan Plateau,thus the formation of the terraces may be the results from combination of climate change and tectonic uplift. By interpretation of high-resolution satellite images,we found as many as 7 river terraces in the Ashikule basin,West Kunlun Mountain,which lies in the interior of the Qinghai-Tibet Plateau. Study on the structure, sedimentary characteristics,and geometric characteristics of these terraces shows that the terraces here are typical tectonic origin. Geomorphology and topography of the terraceswas surveyed with a total station in the field. Surveydata show the heights of the terraces are4～5m ( T1) ,9～10m ( T2) ,16～18m ( T3) ,28 ～31m ( T4) ,and45 ～48m ( T5) respectively. Exposure ages of the terraces were determined by cosmogenic nuclide 10 Bedating methods,which are 7. 7 ± 0. 7ka ( T1 ) ,32. 7 ±3. 1ka ( T2 ) ,53. 6 ±2. 5ka ( T3) ,115. 7 ±23.2ka ( T4) ,166. 8 ±10.4ka ( T5) ,and 19. 5 ±8. 5ka ( T6) . Combine the heights and ages of the terraces,river incision rates since 166. 8ka to now are determined as 0.2～0.35mm/yr. The incision rate of 0.2～0.35mm/yr represents the average uplift rate in the northwestern Tibetan Plateau since 166. 8ka.
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