北祁连天鹿铜矿床砂岩型铜矿石特征

Characteristics of sandstone copper ores in Tianlu copper deposit

天鹿铜矿床是古生代海相砂页岩型铜矿。其铜矿石主要为粉砂岩型,包括斑铜矿矿石、辉铜矿矿石、辉铜矿斑铜矿矿石、黄铜矿斑铜矿矿石、黄铜矿矿石、黄铁矿黄铜矿矿石等6种自然类型。矿石结构主要为结晶结构和交代结构,矿石构造以浸染状为主。主矿层中的矿化沿岩层垂向具有明显的分带性,从底部到顶板为:斑铜矿→辉铜矿→黄铜矿→黄铁矿,具有典型的化学沉积成因铜的硫化物排列组合特征。这些特点与中国及国外海相砂页岩型铜矿相一致。

The Tianlu copper deposit formed in Paleozoic foreland basin is a marine sandshale copper deposit,whose copper ores are mainly of the siltstone type and comprise six kinds of ore species,namely chalcocite ore,chalcocite-bornite ore,bornite ore,chalcopyrite-bornite ore,chalcopyrite ore and pyrite-chalcopynite ore.Ore textures are mainly composed of crystallization texture and metasomatic texture.Ore structures are dominated by disseminations.Along the thickness of strata,mineralization of the major ore bed assumes obvious vertical zonality in the upward order of bornite→chalcocite→chalcopyrite→pyrite,indicating a typical sulfide arrangement and association of sedimentary copper ores.These characteristics are consistent with features of marine sandshale copper deposits both in China and abroad.