河南槐树坪金矿原生晕分带特征及地质意义

Zoning Characteristics of the Primary Halos and Geological Significance in Huaishuping Gold Deposit,Henan Province

槐树坪金矿是豫西熊耳山—外方山地区新发现的一处大型金矿床,矿体赋存于熊耳群鸡蛋坪组上段中酸性火山岩中,产状与安山质围岩大体一致。查明矿床原生晕分带规律,将有助于指导深部找矿并预测成矿远景。通过对槐树坪金矿主矿体化探样品进行多元统计分析和原生晕分带序列计算,得出主矿体K23的原生晕分带序列由上至下为Cu-Mo-Au-Bi-Pb-Hg-W-As-Ag-Sb-Zn,出现头晕、尾晕元素叠加现象,分带序列具有"反(向)分带"特征,推测深部存在盲矿体的可能性较大;K24矿体由数个尖灭再现的同阶段小矿体构成,矿体的原生晕分带序列由上至下为Sb-Au-Ag-Bi-Mo-Hg-As-Pb-Cu-W-Zn,原生晕元素叠加现象不明显,构成一个相对完整的轴向正常分带。研究表明,槐树坪金矿床向深部仍有一定的找矿空间,主矿体原生晕分带序列对区域上寻找同类型矿床具有一定的参考价值。

Huaishuping gold deposit is a new large gold deposit discovered in western Xionger mountain and Waifang mountain, orebody occurrence in Xionger Group of Jidanping Formation in intermediate-acid volcanic rock,while in accord with andesite surrounding rock.Summarizing axial primary halo zoning laws would be helpful to the prospective predict of deep deposit metallogenic and regional prospecting.Through primary halo zoning calculating and multivariate statistical analysis of the main ore body samples, we come to the results that primary halos of K23 ore body zoning sequence from top to bottom is Cu-Mo-Au-Bi-Pb-Hg-W-As-Ag-Sb-Zn, the element of front halo and tail halo is superimposed, primary halos of K23 have the character of inverse zoning, speculate the possibility of exists deep blind ore bodies;K24 ore body consists of several small end-to-end alignment ore body in the same phase,primary halos of K24 ore body zoning sequence from top to bottom is Sb-Au-Ag- Bi-Mo-Hg-As-Pb-Cu-W-Zn,it is not obvious elements of primary halos superposition phenomenon, and constitute a complete normal axial zoning relatively.There are still prospecting space to deep deposit.The zoning sequence have reference meaning looking for the same type deposits on the area.