摘要
陇山群是从祁连山东段原“牛头河群”哑岩系下部分解出来的变质岩系，它包括从下到上的大理岩和片麻岩两个岩组。依其片麻岩组先后同位素年代学的研究，主要最早一组年龄值为８１３—８１１Ｍａ，相当中—上元古代。作者从该岩群的出露和展布，认为在构造体系上，它属祁连山带的基底隆起部分，并讨论了赋存在片麻岩组内陈家庙铁铜矿床的特征及其地质意义。
The Longshan Group,which is a metamorphic rock series separated from the lower part of thebarren rock series of the original“Niutouhe Group”,consists of the marble rock formation and gneissicrock formation in ascending ordcr.According to isotopic geochronological studies,the gneissic rockformation dates 813 881 Ma earlicst age values in the area,corresponding to the Middle-Upper pro-terozoic. Based on the exposure and spreading of the rock group ,it is considered to be an uplifted partof the basement of the Qilian orogen.The characteristic features and geological implications of theChenjiamiao Fe-Cu ore deposit occurring in the gncissic rock formation is also discussed in this paper.
