南华北上二叠统石千峰组物源与沉积环境分析

Sedimentary environment patterns analysis on Shiqianfeng Formation of Upper Permian in southern part of north China

目的为恢复华北南部地区石千峰组原盆地沉积环境格局,为进一步研究华北南部地区二叠系沉积地质与盆地原型提供支持。方法根据岩石碎屑组分基本数据,运用地层厚度、砂岩百分含量、古水流、砂岩成分的系统分析方法。结果研究区地层自南西向北东呈现依次增厚的趋势,整体为北东方向倾斜的宽缓斜坡环境;砂岩分布特征指示物源来自南部隆起区和沉积中心在研究区以北地区。结论华北南部地区石千峰组整体属于近山的海陆过渡相陆缘近海湖环境内的充填物,沉积物质主要来源于南部的秦岭古隆起,并向晚二叠世华北盆地南部提供了大量的陆源碎屑物质。

Aim To recover the map of sedimentary evoriment of Shiqianfeng Formation in the southern of north China, and to support development in sedimentary of Upper Permian in the southern of north China. Methods Based on comprehensive analysis of isopaches, sadstone percentage, paleocurrent and sadstone content, a reaserch is made on the sedimentary environment of Upper Permian Shiqianfeng Formation in the southern of north China. Resuits The result on this sedimentary environment was an offshore terrigenous fresh water lake from permian of Shiqanfeng Formation marinecontinental transitional facies in the southern of north China. Conclusion The sediments mainly have inputs of northern foothills of Qinling paleouplift mountains.