摘要
作为昆阳群中主要含铁层位的“军哨组”和含铜层位的“狮山段”,它们的层位归属,长期以来一直是个争论问题。本文根据军哨矿区出露的地层、构造形态、地层对比等方面的成果,认为“军哨组”老鹅山砾岩代表一个短暂的沉积间断,与下伏地层应为假整合接触,“军哨组”应相当于黑山头组的富良棚段,军哨铁矿体出现于大龙口组碳酸盐岩的相变尖灭部位。从宏观的接触关系、火山和成矿事件看,“狮山段”应是因民组和落雪组的一部分,在区域上绿汁江组中并不存在这一含铜层位。
Stratigraphic horizons of main iron-bearing beds, i.e, the Junshao For-mation and main copper-bearing beds, i.e, the Sishan Member, have been disputed for a long time. According to emergence strata, structural pattern, strata correlation etc. in Junshao ore district, the author recognized that Lao’eshan conglomerate of Junshao Formation represents a sedimentary short gap which is of dis-conformity with underlying strata: So, the Junshao Formation could corres-pond to Fuliangpon Member or the Heshantou Formation. Junshao iron-1a-yer might locate at parts near stratigraphic thin out of carbonate facies of Dalongkou Formation. According to contact relation in macrostructure, volcanism, mineralizing events, it is clear that Sishan Member should belong to part of the Yinming and Luoxue Formation. Regionally, there is no such a copper-bearing stra-tum in the Luzhijiang Formation.
出处
《云南地质》
1993年第1期44-49,共6页
Yunnan Geology
