西藏改则盆地渐新统—中新统康托组沉积相特征  

Sedimentary facies analysis of the Oligocene-Miocene Kangtuo Formation in Gerze Basin,Tibet

作　　者：姜高磊[1,2] 韩芳[1,2] 宋博文[1,2] 韦一[1,2] 江尚松[1,2] 罗亮[1,2] 张克信[1,2] 

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,湖北武汉430074 [2]中国地质大学地球科学学院,湖北武汉430074

出　　处：《地质通报》2013年第1期165-174,共10页Geological Bulletin of China

基　　金：中国地质调查局国家青藏专项项目<青藏高原新近纪隆升过程与地质事件群研究>(编号:1212011121261);国家自然科学基金<重大地质突变期生物与环境协同演化>项目(批准号:40921062)

摘　　要：改则盆地地处青藏高原羌塘地层区,研究程度较低。通过对西藏改则盆地新近系康托组沉积特征和沉积岩相的详细研究,共划分出3类沉积相:扇三角洲相、湖泊三角洲相和湖泊相,整体表现为自下向上沉积物粒度由粗到细、水深逐渐增大的退积序列。综合区域地质特征及古流向分析认为,改则盆地渐新世—中新世的沉积演化可大致分为2个阶段:盆地初始裂陷阶段和盆地稳定沉积阶段。康托组剖面沉积相的研究有助于了解改则盆地渐新世—中新世的沉积演化。The Gerze basin located in the Qiangmng stratigraphic area of the Tibetan Plateau has been very insufficiently studied. Ac- cording to the sedimentary characteristics of the Oligocene-Neogene Kangtuo Pormation, three sedimentary facies have been recog- nized in the Gerze basin, i.e., fan delta facies, lacustrine delta facies and lacustrine facies. In combination with regional geological char- acteristics and paleocurrent analysis, the Oligocene-Neogene sedimentary evolution in the study area is divided into two stages, which in the chronological order are the initial rift-sagging stage and the steady depositional stage. The facies analysis of the Kangtuo section has obviously shed light on the understanding of the Oligocene-Neogene sedimentary evolution in the study area.

关 键 词：康托组 改则盆地 渐新统-中新统 沉积相分析 

分 类 号：P512.2[天文地球—地质学] P534.6