柴达木盆地东北缘大红沟地区古近系露头层序地层  

Outcrop Sequence Stratigraphy of the Paleogene Strata of Dahonggou Region in the Northeast Margin of Qaidam Basin

作　　者：宋博文[1,2] 张克信[1,2] 季军良[1,2] 路晶芳[1,2] 陈锐明[3] 

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室,武汉430074 [2]中国地质大学地球科学学院,武汉430074 [3]西安地质矿产研究所,西安710054

出　　处：《地质科技情报》2011年第3期25-32,共8页Geological Science and Technology Information

基　　金：中国地质调查局项目(1212011121261);国家自然科学基金项目(4092106240830212)

摘　　要：通过对柴达木盆地东北缘大红沟剖面古近纪地层沉积特征的详细研究,识别出冲积扇相、辫状河相、湖泊三角洲相和湖泊相4类沉积相,整体表现为自下而上由粗到细、水深逐渐增大的退积序列。进一步详细的沉积亚相和微相分析、露头准层序叠置方式和水进-水退转换面的分析,在大红沟古近纪地层剖面上划分出6个三级层序和27个四级层序(准层序组),重塑了大红沟地区古近纪相对湖平面升降与沉积演变过程。This paper studies in detail the sedimentary characters of the Paleogene-Neogene clastic succession exposed in the Dahonggou section in the northeast margin of Qaidam Basin.The results indicate that the depositional systems of Paleogene strata in Dahonggou section consist of alluvial fan,braided river delta littoral,and shallow lake from bottom to top,representing a fining-upward and regradational sequence.According to the sedimentary facies,stacking patterns of parasequences and relative lake level fluctuation,sequences of Paleogene strata in the Dahonggou section are divided into six 3th sedimentary sequences and twenty-seven 4th order sequences.It also has reconstructed the course of relative lake level fluctuation and sedimentary evolution of the Paleogene in Dahonggou region in the northeast margin of Qaidam Basin.

关 键 词：柴达木盆地 古近系 高精度层序地层学 

分 类 号：P534.61[天文地球—古生物学与地层学] P539.2[天文地球—地质学]