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一、本区紫斑泥岩的一般特征吕梁山中段交城-古交区,二叠纪地层十分发育,主要为一套陆相泥砂质沉积,由下统山西组陆相含煤建造逐渐过渡为上统石千峰组紫红色砂泥岩建造。总厚550余米。由交城水峪贯地区二叠纪地层简表(表1)可见,早二叠世早期山西组沉积时,无论岩性特征、植物化石及含煤性均属典型的泥炭沼泽相沉积;早二叠世晚期下石盒子组岩性中有机碳含量减少,几乎不含可采煤层,说明当时气候条件已由温暖潮湿逐渐转变为半潮湿性大陆气候,地层
First, the general characteristics of the district purple porphyry Luliangshan middle Jiaocheng - Gujiao District, Permian strata are well developed, mainly a set of continental sediment sediment, from the bottom of the continental group of continental facies coal gradually transition to the upper Stone Shiqianfeng purple sand and mudstone construction. Total thickness of 550 meters. It can be seen from the summary table of Permian strata in Shuiyuaguan area of Jiaocheng (Table 1) that the sedimentary facies of the Early Permian Shanxi Formation, regardless of lithology, phytoliths and coal-bearing properties, are typical peat swamp depositions. Early The lower Permian lithofacies lithology in the organic carbon content decreased, almost without mining coal seam, indicating that the climatic conditions have gradually changed from warm and humid semi-humid continental climate, the formation