论文部分内容阅读
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)火山岩和火山辞屑沉积岩外,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含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-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,果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个于喷流中心和石膏、重晶石层之间的磁异常体中。
The Mesoproterozoic anomalous zone in the north of the Everex region is a relatively alkaline low-lying alkaline-carbonate volcanic underwater activity environment. In addition to the volcanic rocks and volcanic sedimentary rocks, the Minmeto-bearing ore-bearing formations include clay-kyanite, iron, silicalite, iron mudstone, carbonate rock, Rocks, siliceous dolomites and other hydrothermal jets Rocks composed of carbonate rocks and carbonate grains containing sodium silicate gravels are carbonate volcanic rocks. The ratios of high-field-strength elements in rocks and ores, the normalized ratio of rare-earth chondrites and the ratios of Co / Ni and S in sulfide show that the effluent rocks are derived from alkaline-carbonate volcanic rocks and hydrothermal metasomatism is also important for mineralization Contribution, in addition to jet stream rock iron mineralization, as well as copper, cobalt, zinc, silver and so on. If the mineralized rocks in this area are compared with the typical jet ore deposits - Japanese black ore deposits, reticulated mineralized subvolcanic rocks, brecciated lava and mineralized breccias near Guohucun are similar to mineralized Yingan Rock domes and breccias; gypsum-rich BaO-iron mudstones and iron-bearing silicalites in the same layer at the northern margin of magnetic anomalies are equivalent to gypsum and barite sedimentary rocks in low-lying areas. The magnetic anomaly in the area is the same as that of the main ore mine in the jet stream between the spout and gypsum depositional depressions. The iron ore surrounding it is by no means the main mineralization. Large-scale copper-bearing ores should be buried in the deep due to the formation of Minzhu ore-bearing layer in the jet center and gypsum, barite layer between the magnetic anomaly.