滇中易门里士北部水下碳酸质火山-喷流岩铁、铜矿化及其大型隐伏矿床找矿研究
Study on Fe, Cu mineralization generated in subaqueous carbonatitic volcano-hydrothermal activity and their large insidious ore deposit prospecting in the northward of Lishi, Yimen, Central Yunnan
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摘要: 易门里士北部磁异常区中元古代是一个比周边相对低洼的碱性-碳酸质火山水下活动环境，因民组含矿层除有（次）火山岩和火山碎屑沉积岩外，还有粘土质-绿脱石岩、铁质岩、铁质硅质岩、铁质泥岩、碳酸盐岩、泥质白云岩、硅质白云岩等热液喷流岩，舍钠质硅酸盐团砾的碳酸质岩及碳酸盐晶屑组成的岩石是碳酸质火山岩，岩石、矿石的高场强元素对比值、稀土元素球粒陨石标准化比值、硫化物Co／Ni和S同位素比值显示喷流岩源于碱性一碳酸质火山岩，热液交代对成矿作用也有重要贡献，喷流岩除了铁矿化，还有铜、钴、锌、银等。如果将本区矿化岩石与典型喷流矿床——日本黑矿对比，栗树村附近的网脉状矿化次火山岩、角砾熔岩、矿化角砾岩类似于喷流中心的矿化英安岩穹和角砾岩；磁异常北缘相同层位的含石膏富BaO铁质泥岩和铁质硅质岩则相当于低洼地的石膏和重晶石沉积岩。本区磁异常与黑矿主矿一样在喷流岩层内处于喷流口与膏盐沉积洼地之间，其周边的铁矿点绝不是矿化的主体。大型含铜铁矿应该隐伏在深部因民组含矿层介于喷流中心和石膏、重晶石层之间的磁异常体中。
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