渝东北上奥陶统五峰组和下志留统龙马溪组沉积环境分析

Analysis of Sedimentary Environment in Wufeng and Longmaxi Formation in the Northeast Area of Chongqing

一定的沉积环境可以产生特定的地层、岩石、矿物以及古生物的组合。针对渝东北地区上奥陶统五峰组、下志留统龙马溪组的沉积环境,笔者分别从岩性特征、矿物成分、沉积构造、生物特征及B/Ga、Rb/K值进行了深入研究。结果表明,渝东北地区五峰组、龙马溪组烃源岩形成环境主体处于浅海环境,但水体深度在各时期差别较大。

Certain sedimentary environment can produce specific strata, rocks, minerals, and the combination of the palaeobios. Taking the sedimentary environment of Wufeng and Longmaxi formation in northeast Chongqing as the target, we studied the lithologic characteristics, mineral composition, sedimentary structure, biological characteristics and the B/Ga, Rb/K values of this area. The results showed that the main rock body was formed by hydrocarbon source rocks originated from a shallow water environment, while the water depth varied greatly in different periods of time.