商丹地区秦岭岩群孔兹岩系地质特征及石墨资源潜力分析

GEOLOGY OF KHONDALITE SERIES AND GRAPHITE RESOURCES IN THE QINLING GROUP IN SHANGXIAN-DANFENG AREA

秦岭岩群是一套由石英岩、片麻岩、大理岩、变质钙硅酸盐岩、斜长角闪岩组成的中深成变质的沉积—火山岩系,具有(类)孔兹岩系富铝、富碳、富碳酸盐岩,赋存丰富的石墨等非金属矿产资源的典型特征。从孔兹岩系展布与石墨矽线石等矿产资源分布的耦合关系,提出了石墨等非金属找矿方向及4个找矿靶区。

A set of typical khondalite series is determined in the Qinling rock group through contras- tive study on standard khondalites and characteristics of rock assemblage, lithological chemistry, zoning of metamorphic facies and protolith restoration. The Qinling rock group is a set of deep sedi- mentary metamorphic- volcano rock series composed of quartzite, gneiss, marble, metamorphic calc-silicate and amphibolites. They are featured by aluminum-carbon-carbonate-rich Khondalite se- ries, containing abundant graphite and non-metallic mineral resources. Based on relevant informa- tion and through recovery of khondalites metamorphic facies and original rock, the prospecting di- rection and 4 prospecting targets of graphite and other non-metals were proposed in this paper ac- cording to summary of the coupling relationship of mineral resources between the distributions of khondalites and sillimanite graphite.