永平矿区层状矽卡岩的成因及成矿意义-中国科技论文在线.PDFVIP

第 29 卷第 11 期 同　济　大　学　学　报 Vol. 29 No. 11 2001 年 11 月 JOURNAL OF TON GJ I UN IV ERSITY 　Nov. 2001 永平矿区层状矽卡岩的成因及成矿意义 廖宗廷 ,马婷婷 ,李玉加 ( 同济大学 海洋地质教育部重点实验室,上海　200092) 摘要 : 永平铜矿区分布着大型的层状矽卡岩 ,顺层产出. 该层状矽卡矿规模很大 ,长超过 3 500 m ,宽超过 2 500 m ,成分较为简单 ,主要由钙铝榴石和钙铁榴石组成 ,不具接触交代矽卡岩的特征. 研究结果表明 ,该矽卡岩不是 侵入体与碳酸盐岩接触交代的产物 ,而是沉积 - 火山沉积岩经后期热液改造形成的. 层状矽卡岩与矿体在空间 上共存 ,在时间上经历了大致相同的发展演化 ,对矿床进一步富集起了明显作用. 关键词 : 层状矽卡岩 ; 矿术 ; 永平矿区 ( ) 中图分类号: P 54 　　　　　　　文献标识码 : A 　　　　　　　文章编号 : 0253 - 374X 2001 11 - 1322 - 05 On Genesis of Bedded Skarn and Mineralization in Yongping Mining Area L IA O Zong - ting , MA Ting - ting , L I Y u - jia ( Key Laboratory of Marine Geology MOE , Tongji University ,Shanghai 200092 ,China) Abstract : There are large - scale bedded skarns that are much larger than the magmatic intrusion in Yongping copper mining area. They occur as continuous beds conformable with the wall rocks in which there are not zon ings of contact metasomatism skarns. The research results of this paper show that formation of the bedded skarns are not due to the contact metasomatism between the magmatic intrusion and the carbonate rocks ,but the superimposed metamorphism in which the sediment and submarine volcantic sediment reformed by the late tectonism and magmatic intrusion. They coexist closely with bedded ore bodies in space ,and have experienced the same evolution in time. The formation of bedded skarns enriched further bedded ore bodies. Key words : bedded sk