河南省河南庄金矿床Ⅱ号矿体原生晕特征与深部成矿预测

Characteristics of primary halo inⅡorebody and mineralization prediction deep in Henanzhuang Gold Deposit,Henan Province

河南庄金矿床位于北秦岭构造带内,该构造带内成矿地质条件优越,具有较好的找矿潜力。Ⅱ号矿体为河南庄金矿床的主要矿体之一,为进一步探明其深部找矿潜力,针对Ⅱ号矿体进行了原生晕特征分析。结果表明:Ⅱ号矿体原生晕轴向分带序列为Pb-Zn-Au-Mo-Cu-Ag-As-Sb-Bi-W;前缘晕元素为As、Sb、Ag,近矿晕元素为Pb、Au、Zn、Cu,尾晕元素为Bi、Mo、W,元素分布较为混杂,呈现了明显的逆向分带特征,在矿体头部、中部、尾部均出现前缘晕和尾晕叠加现象,表明深部具有较好的成矿潜力。通过钻探工程查证,在Ⅱ号矿体深部对应位置探获矿体,表明通过原生晕方法找矿是可行的,可为矿区深部及周边矿床进一步找矿提供依据和借鉴。

Henanzhuang Gold Deposit is located on the North Qinling Tectonic Belt.The geological conditions in the belt are good,indicating prospecting potentials.Ⅱorebody is one of the major ore bodies in Henanzhuang Gold Deposit.In order to explore prospecting potential deep in the deposit,the paper analyzed the primary halo characteristics of theⅡorebody.The results show that the axial zonation sequence of the primary halo inⅡorebody is Pb-Zn-Au-Mo-Cu-Ag-As-Sb-Bi-W;front halo elements are As,Sb and Ag,near halo elements are Pb,Au,Zn and Cu,tail halo elements are Bi,Mo and W.The elements are distributed in chaos showing evident reverse zonation chara-cteristics,and front and tail halo superposition at the head,middle and tail of the orebody,which indicates there are mineralization potentials deep in the deposit.Drilling verifies that ore bodies are discovered at corresponding spots deep inⅡorebody.It means that it is feasible to discover mineralization through primary halo.The research can provide basis and reference for further prospecting deep in the deposit and peripheral deposits.