内蒙古西乌珠穆沁旗地区阿木山组石炭-二叠纪地层界限划分

Carboniferous-permian Formation Boundary Division of Inner Mongolia XiWuZhuMuQinQi region of the A Mu Fm

本文通过对西乌珠穆沁旗阿木山组进行实地野外地质调查、区域地质资料分析和前人研究成果综合,以实测剖面所取得第一手资料为立足点,以古生物学、岩石学及沉积相分析研究为基础,通过对比分析地层层序、接触关系、岩性岩相组合、古生物组合等特征,获取了来自周边露头石炭-二叠纪地层,建立了阿木山组地质剖面图和柱状图,确定了阿木山组内部分段,并且得出结论:以Triticites(麦粒蜓)带与Pseudoschwagerina(假希瓦格蜓)带古生物变化界线作为石炭—二叠纪地层界线划分位置。

This paper is written based on the field geological survey analysis about regional geological data and com-bines previous research results in AMushan section of Xi Ujimqin Qi. With the first-hand information obtained by measured profile as foothold, paleontology, lithology and sedimentary facies analysis as the foundation, through the comparative analysis of stratigraphic sequence, contact relation, lithologic facies combination and paleontological characteristics, we obtained the surrounding carboniferous-permian strata outcrop, and set up the profile map and columnar section of AMushan geological section, then determine the AMushan section interclass piecewise, and draw the conclusion that carboniferous-permian boundary is located between Triticites subcrassulus fusulinid zone and Sphaeroschwagerina subrotunda fusulinid zone.