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一、铬矿床地质概述 产于太古界斜长角闪片岩中的某超基性岩体上盘的甲矿体和下盘的乙矿体中普遍含有铂族元素。 甲矿体位于超基性岩体中段膨大部位的上盘,南距岩体围岩斜长角闪片岩约210米,呈似脉状赋存在中粗粒纯橄榄岩中,与围岩呈过渡关系。矿体上盘近矿围岩中铬铁矿化广泛发育,下盘矿化很弱。矿体形成在晚期岩浆矿床的晚期阶段。 乙矿体位于超基性岩体中段膨大部位的下盘,北距岩体下盘约350米,呈似脉状赋存于透辉橄榄岩-透辉岩相中的蛇纹石化纯橄榄岩异离体中。矿体与围岩界线清楚,局部为过渡关系。矿体形成在晚期岩浆矿床的早期阶段。
I. CHROMIUM ORE GEOLOGICAL OVERVIEW Platinum group elements are commonly found in the ore bodies of the ore bodies of the upper and lower plates of an ultramafic rock appearing in the Archean plagioclase feldspathic rock. A ore body is located in the upper part of the ultramafic rock mass in the upper part of the disk, south of the rock pluton amphibolites about 210 meters, was like veins exist in the coarse-grained dunite, and the surrounding rock transition relationship. The chromite mineralization in the ore body near the ore body is widely developed, and the mineralization under the plate is very weak. Ore bodies formed in late stages of late magmatic deposits. B ore body is located in the middle part of the ultramafic rock mass swollen parts of the lower plate, about 350 meters north of the lower body of the rock, was like veins occur in the diopside peridotite - peridotite facies serpentinized dunite Alien body. Boundary between the orebody and the surrounding rock is clear, and the transitional part is the transitional part. Ore bodies formed in the early stages of late magmatic deposits.