对云南施甸摆榔乡上泥盆统大寨门组和下石炭统香山组的重新厘定

小龙塘剖面位于云南省施甸县摆榔乡南东处,地层划分上属于藏滇地层大区东部的保山地层分区,施甸地层小区,奥陶-石炭世沉积普遍发育。剖面测制为一套开阔台地相(潮下带)碳酸盐岩沉积,岩层产状稳定,属单斜地层。与前人在该剖面上所划大寨门组、香山组从岩性上有所不同。根据建组剖面及区域对比,推测小龙塘地区晚泥盆-早石炭世沉积被姚关断裂及湾甸河断裂断蚀。据此,对小龙塘上泥盆统大寨门组和下石炭统香山组进行重新厘定,为1∶50 000湾甸坝幅区域地质矿产调查提供新的参考。

Redetermination of the Dazhaimen Formation (Upper Devonian) and Xiangshan Formation (Lower Carboniferous) in Bailang, Shidian, Yunnan, China

Xiaolongtang section isSlocatedSin the south east of Bailang, Shidian, Yunnan, stratigraphic division belongs toSShidian Stratigraphic Microprovince, Baoshan Stratigraphical Subprovince,Tibetan and Yunnan Stratigraphic Province. And the Ordovician-Carboniferous deposits were widely developed. The measured stratigraphic section shows that it was a carbonateSdeposition of openSplatform facies(subtidal zone)S.And theSattitudeSofSrock formationsSis stable, it is monoclinal stratum. CompareSour work with the Dazhaimen Formation and Xiangshan Formation which were divided by predecessors that the lithology are different. Then according to the type sections and regionalScorrelation, this paper conjectures that the Upper Devonian and Lower Carboniferous deposits in Xiaolongtang region were broke down bySYaoguan fault and Wandianhe fault. BasedSonSthe study above, the Dazhaimen Formation (Upper Devonian) and Xiangshan Formation (Lower Carboniferous) in Xiaolongtang are redetermined, and this result will provide the latest reference for 1:50000 Wandianba regional geological survey.