摘要
现代湖盆源-汇系统分析,可为古代源-汇系统研究提供参考依据.将云南洱海现代湖盆源-汇系统划分为西(S2SW)、东(S2S-E)、北岸(S2S-N)3个独立的源-汇系统,S2S-E物源区母岩主要为碳酸盐岩,沉积体数量少、规模小(<10km2);S2S-W物源区母岩主要为变质岩及少量花岗岩、碳酸盐岩,沉积体数量多、规模大(>40km2),相互叠置、连片分布;S2S-N为轴向物源型源-汇系统,母岩主要为碎屑岩,沉积物供应充足,形成大型沉积体.研究表明,同一盆地(洼陷)内可存在多个源-汇系统,由于母岩类型、构造活动、古地貌等因素的影响,可造成不同源-汇系统的流域面积、沉积区面积及沉积响应存在差异,在古代源-汇系统研究中需重视不同源-汇系统之间的差异性研究.
Studies of the modern Source-to-Sink system in Lake Basin can provide a basis for studying their ancient counter parts.In this paper,we analyzed characteristics of modern Source-to-Sink systems in the Lake Erhai basin and identified three subsystems in the western（S2 S-W）,eastern（S2 S-E）and northern（S2 S-N）shores of the Lake Erhai basin,respectively.In S2 S-E,the bedrocks in source area are primarily carbonate rocks and the number and scale of sedimentary bodies in sink area is small（〈10 km^2）;in S2 S-W,the bedrocks in source area consist of metamorphic rock sand a few granitic and carbonate rocks,and large scale（〉40 km^2）sedimentary bodies in sink area easily developed,feature in gextensive and concatenated distribution;in S2 S-N（axial source）,bedrocks are composed mainly of clastic rocks and the scale of sedimentary bodies in sink area are large.Studies of modern Source-to-Sink system in Lake basin suggest that there are many Source-to-Sink systems in the same basin（sag）and in which significant distinctions between the watershed area,sedimentary body area and sedimentation response exist because of controlling factors such as bedrock type,tectonic activity,paleomorphology,basin boundaries,and transport channel,among others,which implies that more attention should be paid to the distinguishing characteristics of Source-to-Sink systems in further study of ancient Source-to-Sink systems.
出处
《地球科学（中国地质大学学报）》
EI
CSCD
北大核心
2017年第11期2010-2024,共15页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金项目(No.41572084)
国家科技重大专项(No.2016ZX05024-003-007)
关键词
洱海
源-汇系统
母岩类型
差异性
控制因素
沉积
石油地质.
Lake Erhai basin
Source-to-Sink system （S2S）
bedrock
varieties
controlling factors
sedimentary
petroleum geology.
