云南洱海现代湖盆源—汇系统划分、特征及差异

发布时间：2018-11-01 18:44

【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.
[Abstract]:The analysis of modern lake basin source-sink system can provide reference for the study of ancient source-sink system. The modern lake basin source-sink system of Erhai Lake in Yunnan Province is divided into three independent source-sink systems: S2SW, S2S-E and S2S-N. The parent rocks of S2S-E source area are mainly carbonate rocks, and the quantity of sedimentary bodies is small and the scale is small (10km2). The parent rocks in the S2S-W source area are mainly metamorphic rocks and a small amount of granites, carbonate rocks, large amounts of sedimentary bodies (40km2), superimposed and distributed in successive sections. S2S-N is an axial source-sink system, the parent rock is mainly clastic rock, and the sediment supply is sufficient to form a large sedimentary body. The study shows that there are many source-sink systems in the same basin (sag). Due to the influence of parent rock type, tectonic activity and paleogeomorphology, the basin area of different homologue sink system can be caused. There are differences in the area of sedimentary area and sedimentary response. In the study of the ancient source-sink system, we should pay attention to the difference between the different homologue and sink systems.
【作者单位】：中国地质大学构造与油气资源教育部重点实验室;美国德克萨斯大学奥斯汀分校;
【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)
【分类号】：P56

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