嵩县东湾金矿床原生晕垂直分带特征及其意义

嵩县东湾金矿床赋存于中元古宇熊耳群鸡蛋坪组火山岩中，属岩浆热液蚀变岩型金矿床．矿区在原生晕研究方面存在一定空白，矿床受区域性大断裂控制，主矿体在垂向上的原生晕分带明显．通过对控矿断裂F．的地表、浅部坑道及深部钻孔中金矿脉及其围岩原生晕采样工作，及样品中Au，Ag，Cu，Pb，zn，Co，Ni，Ba8种元素的化学分析，得出Ba是金矿体的前缘指示元素，在矿体前缘和上部富集形成异常；Au，Ag，cu，Pb，zn是金矿体的近矿指示元素，在矿体上、中、下部富集形成异常；Co，Ni是矿体尾部指示元素，在矿体的下部富集形成异常．计算出矿体的垂直正向分带序列为Ba-Pb．Zn-Au．Ag．Co．cu-Ni．推断该矿体的地表出露部分为矿体的中上部，深部有较大的找矿潜力．

Vertical zoning characteristics and significance of primary halo in dongwan gold deposit, Songxian county

Dongwan gold deposit of Songxian County occurs in volcanic rocks of Jidanping Formation,Xiong’er Group,Mesoproterozoic,which is magmatic hydrothermal altered rock type gold deposit.Mine field has a certain blank on the study of primary halo.The deposit is controlled by regional fracture.The major orebody zoning characteristics of primary halo in vertical are clear.By means of sampling of gold orebody primary halo from surface,shallow adit,deep core of drill hole and chemical analysis of Au,Ag,Cu,Pb,Zn,Co,Ni,Ba,we found that Ba is the front indicator element of gold orebody,which is enriched in the front and upper part of orebody and forms anomaly;Au,Ag,Cu,Pb,Zn are the near-ore indicator elements of gold orebody,which are enriched in the upper,middle and lower parts of orebody and form anomalies;Co and Ni are the rear indicator elements of gold orebody,which are enriched in the lower part of orebody and form anomalies.Through calculating,we get that the vertical normal zoning sequence is Ba-Pb-Zn-Au-Ag-Co-Cu-Ni.Then we deduce the exposed part is the middle-upper part of the orebody.There will be large potential of prospecting in deep.