地质通报2017，Vol.36Issue(6)：1022-1031,10.
柴达木路乐河地区新生代碎屑组分变化及其对构造隆升的指示
Compositional variation of Cenozoic detritus in the Lulehe area, Qaidam Basin, and its implications for Tibetan Plateau tectonic uplift
摘要
Abstract
The change of detrital composition is a typical manifestation of the evolutionary process of sedimentary sources.As an important part of the Qaidam Basin,the sedimentary strata in Lulehe have recorded tectonic uplift evolution of northern Tibetan since the Indo-Asian collision.All signatures,along with high feldspar content,provenance and contrast with adjacent mountain rocks,reveal that the source region for Lulehe mainly came from Qilian and Saibei thrust.And there existed a coupling relationship between the change ofclastic composition content and surrounding orogen.Three significant depositing transformation events occurred in Lulehe area,corresponding to the Indo-Asian collision and plateau tectonic uplift from Cenozoic in 53.5～2.9Ma.The rapid uplift of southern Qilian,which happened at ca.50.1～46.6Ma,responded to the propagation of initial continental collision.The uplift of Tibetan Plateau with crustal vertical growth and thrust structure caused top erosion of Saibei thrust and provenance transformation event in Lulehe in Eocene (44.5Ma).Both of Saishiteng and Qilian Mountain supplied sediments at the end of Oligocene (22.6Ma) when different regions in plateau were raised synchronously.The findings will provide new crucial sedimentary data for deep understanding of evolutionary history of whole Tibetan Plateau and distant effect of the continental collision.关键词
路乐河/碎屑组分/物源转换/构造隆升Key words
Lulehe/detrital composition/provenance transformation/tectonic uplift分类
天文与地球科学引用本文复制引用
李高杰,伊海生,夏国清,杨嘉宝..柴达木路乐河地区新生代碎屑组分变化及其对构造隆升的指示[J].地质通报,2017,36(6):1022-1031,10.基金项目
国家自然科学基金项目《东昆仑山新生代构造隆升的碎屑矿物裂变经迹记录》(批准号:41402099) （批准号:41402099）
