【摘要】 应用电感耦合等离子体质谱(ICP-MS)对黔东南平秋金矿浅部含金石英脉矿石、近矿围岩以及远矿番召组岩石的微量及稀土元素进行系统测定,结果表明:矿石中Au,As和Sb等成矿元素与围岩和地层相比发生了相对富集。R型聚类分析呈现出Au与壳源物质As,Pb和Sb等低温元素有密切的成因联系,表明金可能主要来源于地壳。根据微量和稀土元素特征分析可以将石英脉矿石分为两种类型,一类以样品k2,k4为代表的含金石英脉矿石与近矿围岩和赋矿地层岩石的微量元素变化趋势和稀土元素配分模式基本一致,表现出与围岩地层的一致性和继承性;另外一类英脉矿石(样品k1,k3)的微量及稀土元素地球化学特征与围岩有明显差异,轻重稀土分异不显著,Eu异常不明显,更接近下地壳或上地幔的稀土组成特征。综合分析认为该矿床含金石英脉矿石与围岩存在一定的成因联系,其成矿物质和成矿流体除了来源于赋矿地层外,可能有部分深部流体参与成矿。更多还原

【Abstract】 The result shows that the REE pattern of quartz is similar to.The trace element and REE in Shallow gold-bearing quartz veins,wall rock from Pingqiu gold deposit and the host strata rocks have been determined by Inductively Coupled Plasma-Mass Spectrometry(ICP-MS).The result shows that the ore-forming elements(Au,As and Sb,etc) in auriferous quartz veins was relative enrichment.The R-title clustering analyse shows that Au has a close genetic relationship to crustal material As,Pb and Sb,implying that gold probably originated from the crust.The auriferous quartz veins can be divided into two types according to the trace element and REE geochemical characteristics.The trend of trace element contents and REE patterns in a part of auriferous quartz veins(k2 and k4)are almost the same to the wall rock.The another part of quartz veins ores whice the differentiation of LREE and HREE was not significant,and not obvious Eu anomaly,their REE patterns were significant differences from the wall rock,but displays mantle-derived or the lower crust.Basing on the analyses,we believe that there are some genetic relations in the auriferous quartz veins and wall rock,and the ore-forming materials and metallogenic fluids of shallow quartz veins should be a part come from the ore-hosting strata and another from the deep part.更多还原