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一、概况大红山群是西昌——滇中地区重要含铁铜矿地层,在云南以大红山矿区出露最好。从岩性、岩相特征,变质程度,构造部位及含矿性诸方面分析,一种观点认为大红山群可与元谋苴林群的阿拉益组及川南会理群的河口组对比;认为大红山群层位比昆阳群低,变质比昆阳群深,岩性组合、矿床类型等都与昆阳群有很大的差异,是另一套富钠质火山岩的含矿建造,是康滇地轴上比昆阳群更老的地层。另一种观点认为可与昆阳群的某些组段对比。但大红山群所出露底部的老厂河组之下究竟隐伏着什么地层?有没有含矿层位?有没有更老的结晶基底?这是广大地质工作者所关注的。
I. Overview Dahongshanqun is Xichang - an important iron-bearing copper deposits in central Yunnan, Yunnan Dahongshan mine exposed the best. From the perspective of lithology, lithofacies, metamorphism, tectonic positions and ore-bearing aspects, one view is that the Dahongshan group can be compared with that of the Alamed group and the Chuanhui Huili group in Yuanmou; Dahongshan group is lower than Kunyang group, metamorphic than the Kunyang group, lithology combination, deposit type and Kunyang group are all very different, is another set of sodium rich volcanic ore-bearing construction, Kang and Dian than the Kunyang axis of the older strata. Another point of view that can be compared with some of Kunyang group of segments. However, what kind of strata under the Laochanghe Formation exposed at the bottom of the Dahongshan Group? Are there any ore-bearing beds? There is no older crystalline base? This is the concern of the majority of geological workers.