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研究区位于华北地台鄂尔多斯地区东南部,主要包括洛南县巡检镇地区。在前人研究和野外露头资料的基础上,系统分析研究区中元古代不同时期的构造沉积特征,对鄂尔多斯盆地东南缘中元古代时期有了较为全面而系统的认识。研究发现:(1)鄂尔多斯盆地东南缘中元古代为一裂谷盆地,其层序在纵向上存在断拗双层结构;(2)该地区中元古代熊耳期为一裂谷盆地,长城纪和蓟县纪变为裂谷后凹陷环境,先后发育了潮坪-河口砂坝相高山河群、汝阳群沉积和洛南群白云岩沉积。
The research area is located in the southeastern part of Erdos area in North China, including the area of Patrol Town in Luonan County. Based on the previous studies and field outcrop data, the tectono-sedimentary features of Mesozoic and Proterozoic in different periods of the study area are systematically analyzed, which provides a comprehensive and systematic understanding of the Mesoproterozoic and southeastern margin of the Ordos Basin. The results show that: (1) Mesoproterozoic in the southeastern margin of Ordos Basin is a rift basin, and the sequence of the basin is longitudinally fault-broken double-layer structure. (2) The Proterozoic bear ear in this area is a rift basin, And Jixian Jiji into a post-rift depression depression environment, the Tidal Flat-estuary sand-alpine group, the Ruyang Group and the Luonan Group dolomite have been developed.