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.
出处
《地质通报》
CAS
CSCD
北大核心
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)
关键词
康托组
改则盆地
渐新统-中新统
沉积相分析
Kangtuo Formation
Gerze basin
Oligocene-Miocene
sedimentary facies analysis
