| 青藏高原北部可可西里盆地第三纪风火山群沉积环境分析 |
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| 引用本文： | 刘志飞,王成善.青藏高原北部可可西里盆地第三纪风火山群沉积环境分析[J].沉积学报,2001,19(1):28-36. |
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| 作者姓名： | 刘志飞 王成善 |
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| 作者单位： | 1 同济大学海洋地质教育部重点实验室 上海 200092; |
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| 基金项目： | 国家重点基础研究发展规划项目! (G1 9980 4 0 80 0 )，国土资源部九五重大基础项目! (950 1 1 0 1 0 2 )，中国博士后科学基金资助 |
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| 摘 要： | 青藏高原北部的可可西里盆地是高原腹地最大的第三纪沉积盆地,分布着沉积厚度达 4 782.8m的早始新世-早渐新世风火山群灰紫色砂岩、泥岩和砾岩,其沉积环境演化经历了四个阶段,从早期 56.0～ 52.2Ma河流为主的环境,到中期 52.2～ 4 3.1Ma的湖泊环境和 4 3.1～ 3 8.3Ma的河流与扇三角洲环境,演变到晚期 3 8.3～ 3 2.0Ma河流为主的环境。古水流方向也由北东向变为南东向,到晚期又转变为北向为主,反映盆地沉积中心逐渐向东向北迁移。这种沉积环境演化和盆地沉积中心迁移可能受青藏高原早期隆升的影响.
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| 关 键 词： | 沉积环境 风火山群 第三纪 可可西里 青藏高原 |
| 文章编号： | 1000-0550(2001)01-0028-09 |
| 收稿时间： | 2000-01-21 |
| 修稿时间： | 2000年1月21日 |
Depositional Environment of the Tertiary Fenghuoshan Group in the Hoh Xil Basin, Northern Tibetan Plateau |
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| LIU Zhi-fei,WANG Cheng-shan.Depositional Environment of the Tertiary Fenghuoshan Group in the Hoh Xil Basin, Northern Tibetan Plateau[J].Acta Sedimentologica Sinica,2001,19(1):28-36. |
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| Authors: | LIU Zhi-fei WANG Cheng-shan |
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| Institution: | 1 Laboratory of Marine Geology, Tongji University,Shanghai 200092;2 Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059 |
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| Abstract: | Fenghuoshan Group,with total thickness up to 4 782.8 m and geologic age from Early Eocene to Early oligocene,is widely distributed in the Hoh Xil basin,which is the largest Tertiary sedimentary basin in the hinterland of the Tibetan plateau. The pile of sediments consists of gray-violet sandstone, mudstone, and conglomerate. The evolution of depositional environment has undergone four periods: mainly fluvial environment during 56.0～52.2 Ma, lacustrine environment during 52.2～43.1 Ma, fluvia land fan-delta environments during 43.1～38.3 Ma, and mainly fluvial environment during 38.3～32.0 Ma. Paleocurrent directions were changed to eastsouthward from east northward in the early period, then to northward in the late period. These changes indicate the depocenter of the Hoh Xil basin migrated eastward and northward. The evolution of the depositional environment and migration of the depocenter could be affected by early uplift of the Tibetan plateau. |
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| Keywords: | depositional environment Fenghuoshan Group Tertiary Hoh Xil basin Tibetan plateau |
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