东升庙硫多金属矿床有机质与成矿关系

将东升庙矿床矿井下采得矿石制成薄片后进行电子探针测试,主要关注测试点内元素碳的含量及存在形式。测试结果显示在闪锌矿、磁黄铁矿、黄铁矿、黄铜矿的矿物本身能检测到含量不等的碳元素,方铅矿中未检测到碳元素,分析其与成矿性质有关。此外,在这些矿物周围的脉石矿物内则检测到了白云石、菱镁矿、铁的碳酸盐化物与氢氧化物的混合物质,元素C多以碳酸盐形式出现。在金属矿物周围交界处及矿物包裹体内检测到有高含碳物质(碳元素含量75%以上),结合矿床本身特性,推测为有机质。通过对测试结果的对比分析,从微观的角度说明有机质与金属矿物存在空间上的密切联系,并参与了成矿过程。

Relationship between Organic Matters and Mineralization in Dongshengmiao Sulfide Polymetallic Deposit

Electron probe micro-analyser (EPMA) has been used to analyze the content and existence form of element C among the thin slices of metallic ore from Dongshengmiao sulfide polymetallic deposit.The results showed that different content of carbon are detected from metallic minerals such as sphalerite,pyrrhotite,pyrite and chalcopyrite,but the there is no element C existed in galena which may be related to the nature of Pb mineralization.In addition,dolomite,magnesite and the compound of hybrid materials of carbonate and hydroxide of Fe are detected in the gangue minerals around these metallic minerals,and in most cases,element C is existed in the gangue minerals in the form of carbonate.The high carbon content of material is detected in the surrounding junction area of different metallic minerals and the metallic minerals inclusions (the content of C more than 75%),which is speculated to be the organic matter combing with the characteristics of the sulfide polymetallic deposit.The contrast analysis on test results indicated that the organic matter has a close relationship with metallic minerals and participates in the mineralizing process from the microcosmic view.