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柴达木地块与喜马拉雅地体间早白垩世以来南北向缩短量的估算
引用本文:李朋武,崔军文.柴达木地块与喜马拉雅地体间早白垩世以来南北向缩短量的估算[J].地质论评,2000,46(6):569-572.
作者姓名:李朋武  崔军文
作者单位:中国地质科学院岩石圈中心,北京,100037
基金项目:国家新疆305项目06-04专题,国家重点基础研究发展规划 (编号G1998040800)经费资助
摘    要:根据古地磁数据,笔者计算了柴达木地块和喜马拉雅地体早白垩世以来的南北向运移量和其间的南北向距离缩短量,结果表明:①早白垩世后喜马拉雅地体快速向北运移,其运移在于柴达木木地块同时期的运移速率,早白垩以来,两者间南北向距离总计缩短了约5522km;②印度地块与欧亚大陆自50Ma碰撞以来,柴达木地块与喜马拉雅地体间南北向上陆壳缩短了约1364km,这一缩短量支持青藏高原隆升的“挤压、缩短、增厚”模式;③

关 键 词:青藏高原  柴达木  喜马拉雅  缩短量  古地磁数据

Longitudinal Shortening Amount between the Himalayan Terrain and the Qaidam Block Since the Early Cretaceous
Li Pengwu Cui Junwen Gao Rui Li LiLithosphere Research Centre,Chinese Academy of Geological Sciences,Beijing.Longitudinal Shortening Amount between the Himalayan Terrain and the Qaidam Block Since the Early Cretaceous[J].Geological Review,2000,46(6):569-572.
Authors:Li Pengwu Cui Junwen Gao Rui Li LiLithosphere Research Centre  Chinese Academy of Geological Sciences  Beijing
Abstract:A contrast of the longitudinal movement of the Himalayan terrain and the Qaidam block and the shortening amount between them since the Early Cretaceous shows that (T) The Himalayan terrain began to shift northward rapidly after the Early Cretaceous, and the shifting rate was greater than that of the Qaidam block. The total shortening amount between them since the Early Cretaceous reaches ca. 5522 km. (2) The longitudinal crust shortening amount between them is ca. 1364 km in total since the collision of the Indian with Asian continents at 50 Ma. The shortening amount supports the compression-shortening-thickening pattern of the Qinghai - Tibet Plateau uplift. (3) The slower northward shift of the Qaidam block since the Mesozoic shows that it has been subjected to the evolution of the Tethys. The evident difference in the shift rate between the Himalayan terrain and the Qaidam block indicates that the latter not only shifted northward synchronously with the former but also obstructed the northward shift of blocks to its south.
Keywords:Qinghai-Tibet Plateau  Qaidam  Himalayas  shortening amount
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