现代地质2017，Vol.31Issue(6)：1251-1260,10.
柴达木盆地新生代湖相叠层石沉积序列及古环境意义
Sedimentary Sequences and Implications for Paleoenvironment of Cenozoic Lacustrine Stromatolites, Qaidam Basin
摘要
Abstract
Climate,sedimentary environment and lake level are the major factors that intervene the growth of stromatolites directly or indirectly.Correspondingly,stromatolites are certain qualitative indicators for the controlling factors.Comparisons of vertical bedding position and basic sedimentary sequences are made between the two Cenozoic lacustrine stratigraphic sections,Changweitai and Xichagou section in western Qaidam Basin.We identified two Cenozoic high lake-level periods in Qaidam Basin when these stromatolites were thriving,even in adjacent Cenozoic basins in Qinghai-Tibetan Plateau.This might indicate large-scale regional humid climate in Miocene,when strong precipitation and evaporation went simultaneously or alternatively.Four types of basic sedimentary sequences containing stromatolites are proposed,and the stromatolites can develop on the surface of the clay stone or sandstone and conglomerate hard ground.On the top of stromatolitic layer are the fine siliciclastic sediments or sedimentary gap,indicating that the growth of stromatolites follow the minor flooding surface and the sudden rise of relative lake surface.关键词
湖相叠层石/沉积序列/中新世/高原湖泛事件/柴达木盆地Key words
lacustrine stromatolite/sedimentary sequence/Miocene/high-level lake period/Qaidam Basin分类
天文与地球科学引用本文复制引用
曾令旗,伊海生,夏国清,袁桃..柴达木盆地新生代湖相叠层石沉积序列及古环境意义[J].现代地质,2017,31(6):1251-1260,10.基金项目
国家自然科学基金青年基金项目“东昆仑山新生代构造隆升的碎屑矿物裂变径迹记录”(41402099). （41402099）
