河南下蒿坪金矿K_2矿体原生晕特征及深部成矿预测

下蒿坪金矿K2矿体受店房隐爆角砾岩边缘的环状构造控制,矿床具有明显的岩浆热液特征。对矿体的原生晕特征分析表明,Au、Ag、Cu、Pb、Zn相互之间有较好的相关性,W、Mo与其他元素的相关性均较差,因子分析反映出成矿过程具有多期次叠加特点。计算得到矿体的原生晕轴向分带序列由上到下为Mo-Au-Cu-As-Bi-W-Ag-Sb-Zn-Pb,出现头晕和尾晕元素叠加的"反向分带"特征。研究认为K2矿体具有上金下银的分带模式,预测在478 m标高以下具有较好的银成矿潜力。

Characteristics of Primary Halo and Deep Metallogenic Prediction of K 2 Orebody in Xiahaoping Gold Deposit,Henan Province

The K2 oreboby in Xiahaoping gold deposit is controlled by the ring-shaped structure of the edge of Dianfang cryptoexplosion breccia,Xiahaoping K2 deposit behaves the features of magmatic hydrothermal solution. The primary halo feature research of the orebody shows that Au,Ag,Cu,Pb,Zn has good correlation with each other, but the correlation of W,Mo and other elements is poor.Factor analysis reflects characteristics of superposition of multiple metallogenetic superimposition during the ore-forming process.It is calculated that axial element zoning of the primary halos of this deposit is Mo-Au-Cu-As-Bi-W-Ag-Sb-Zn-Pb from top to bottom,there are characteristics of reversed axial zonality with the element of front halo and tail halo superimposed.Results show that the zoning pattern of this K2 orebody is that silver locates under gold,therefore,we predict that it has good metallogenic potential of silver under 478 m elevation.