贵州三都苗龙金矿床黄铁矿的矿物学特征及其电子探针研究
首发时间:2013-01-30
摘要:本文对苗龙金锑矿床成矿期主阶段的含金环带状黄铁矿进行研究,发现这种环带状黄铁矿具有简单环带和复杂环带特点。利用电子探针(EPMA-1720)对其内核和外环成分分析表明,金成矿期主阶段金与砷有密切的地球化学相关性,在富砷增生环带发育时,金与砷共沉淀,内核Au、As含量较低,平均分别为0.0241%和0.09642%,S含量和理论值接近,Fe具有弱亏损特征;外环Au、As含量较大,平均分别为0.0429%和1.4668%,Fe、S值与黄铁矿理论值相比,亏铁亏硫特点。环带状黄铁矿内核中,金以纳米级自然金颗粒(Au0)形式存在,外环中,金以纳米级自然金颗粒Au0的形式和不可见金固溶体(Au+)形式存在。
关键词: 含砷环带状黄铁矿 电子探针 矿物学特征 金矿 贵州苗龙
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The Mineralogical Characterstics And Electron Probe Studies On The Pyrite Of The Miaolong Gold Deposit,Sandu Guizhou
Abstract:In this paper we study on antimony mineralization period containing circle banded pyrite in the main stage of the Miaolong gold deposit,find that this zonal pyrite has the characteristics of simple ring with complex zoning. Components of its kernel and outer ring components analysis using electron probe microanalysis (EPMA-1720) show that the gold mineralization of the main stage gold and arsenic the close geochemical correlation in the arsenic-rich with hyperplasia central developed, gold and cores The content of Au, As in the cores is low, average 0.9642% and 0.0241%, respectively, the S content is closer to the theoretical values, Fe having a weak Eigenexponent; The content of Au, As in the outer ring is larger, the average of 0.0429% and 1.4668%, respectively, Fe and S values are compared with the theoretical value of the pyrite, loss of Fe and S characteristics. Annular pyrite kernel, gold natural nanoscale gold particles (Au0) form the outer ring, the gold in the form of nanoscale natural gold particles Au0 and is not visible gold (Au+) form of a solid solution exists.
Keywords: Arsenic zonal pyrite Electron Probe Mineralogical Characterstics Gold deposit Miaolong Guizhou
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贵州三都苗龙金矿床黄铁矿的矿物学特征及其电子探针研究
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