从青藏高原南北两个磨拉石剖面的对比看青藏高原的隆升过程  

Uplift Processes of the Qinghai-Tibet Plateau Interpreted from the Comparison of Yecheng Section and Siwalik Group

作　　者：李孝泽[1] 董光荣 陈惠中[1] 郑洪波[2] 靳鹤龄[1] 金炯[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [2]同济大学海洋地质教育部重点实验室,上海200092

出　　处：《中国沙漠》2001年第4期354-360,共7页Journal of Desert Research

基　　金：国家自然科学基金项目 ( 4 980 2 0 16 ) ;国家重点基础研究项目 (G19990 4340 2 ) ;中国科学院沙坡头沙漠研究与试验站开放基金( 2 0 0 0 0 9) ;中国科学院寒区旱区环境与工程研究所风沙物理与沙漠环境实验室资助

摘　　要：通过对昆仑山北麓的叶城剖面的实测及其与喜马拉雅山南麓的SuraiKhola剖面的对比分析表明 ,约 10MaBP以来 ,青藏高原以持续性隆升为主 ,划分高原整体隆升阶段的有效时间尺度下限是 1Ma ,高原隆升过程可划分为三大阶段 :10 0～ 6 0MaBP ,高原整体缓慢隆升 ;6 0～ 2 5MaBP为过渡性隆升阶段 ;2 \^5MaBP以来高原整体快速隆升。高原整体隆升高度可能于 4 6MaBP超过海拔 2 0 0 0m ,2 5MaBP超过海拔 30 0 0m。Comparative analysis of the Yecheng seciton at north piedmont of the Kunlun Mountain, and the Surai Khola section at south piedmont of the Himalayan Mountain, suggests that the Qinghai-Tibet plateau is dominated by continuous uplift over the past 10 million years, and the effective time scale for dividing the entire plateau uplift processes is 1 Ma or more. The entire process of the entire plateau can be divided into three stages based on sediment facies and deposit ratio, namely slow uplift stages between 10^0～6^0 Ma BP; transitional uplift stage between 6^0～2^5 Ma BP (including medium-velocity uplift of the south part of the plateau and low-velocity uplift of the north part of the plateau during 6^0～4^6 Ma BP; medium-velocity uplift of the south part of the plateau and high-velocity uplift of the north partole the plateau during 3^5～2^5 Ma BP), and the high-velocity uplift stage after 2^5 Ma BP. The uplift elevation of the entire plateau exceeded {2 000} m above sea level maybe by 4^6 Ma BP and exceeded{3 000} m above sea level by 2^5 Ma BP.

关 键 词：青藏高原 隆升过程 隆升高度 叶城剖面 磨拉石 西瓦利克群 

分 类 号：P542.2[天文地球—构造地质学]