湖南香花岭锡铍多金属矿区的含Li、Be条纹岩和有关交代岩

摘要

The Li,Be-bearing ribbon rocks and related metasomatites in the Xianghualing tin-beryllium-polymetallic orefield are unique in the world.They occur in the F-rich granite contact zones and zenolith of wall rocks.The wall rocks are limestone and dolomitic limestone of Middle-Upper Devonian period.According to mineral paragenesis,the ribbon rocks may be divided into five types,i.e.,zinnwaldite ribbon rock,fluoborite ribbon rock,chrymberyl ribbon rock,chondrodite-magnetite ribbon rock and phlogopite-chlorite ribbon rock.The related metammatites were formed late and may be divided into six types,i.e.,Xianghualite metasomatite,phlogopite metammatite,chondrodite metasomatite,vesuvianite-magnetite metasomatite,phlogopite-chlorite metasomatite,and paragarite metasomatite.The geological setting,mineral paragenesis,and geochemistry of the ribbon rocks and related metasomatites are discussed in this paper.%湖南香花岭锡铍多金属矿床的含Li、Be条纹岩和有关交代岩,在世界上独一无二,产于燕山期(155～154 Ma)富氟花岗岩接触带及岩体的围岩捕掳体中,围岩为中上泥盆统灰岩和白云质灰岩.按矿物共生组合特征,条纹岩可大致分为铁锂云母条纹岩、氟硼镁石条纹岩、金绿宝石条纹岩、粒硅镁石-磁铁矿条纹岩和金云母-绿泥石条纹岩5类.与条纹岩有关的交代岩生成稍晚,可大致分为香花石交代岩、金云母交代岩、粒硅镁石交代岩、符山石-磁铁矿交代岩、金云母-绿泥石交代岩和韭闪石交代岩6类.文章对条纹岩和有关交代岩的生成地质背景、矿物共生组合和岩石地球化学特征进行了探讨.