秦岭若干重要类型金矿床(体)快速定位预测

本文以西部秦岭地区八卦庙、双王、煎茶岭 3种重要类型金矿床为例 ,在成矿地质背景研究基础上 ,开展若干新方法新技术的找矿试验 ,研究发现 ,八卦庙式金矿岩石的烃含量与其金品位大致成正相关关系 ;而且金矿化强度和规模越大 ,相关系数值也越大 ;据此根据石英脉的烃含量对隐伏金矿床 (体 )和金矿化规模进行预测。双王式金矿原生晕的前缘晕元素为B、As、Sb、Hg,近矿晕元素为Au、Ba(-) ,尾晕元素为Mn、Bi。通过原生叠加晕垂向研究预测 ,双王和八卦庙金矿床现有的金矿体向下延伸还较大 ,在矿床的深部存在有盲矿体。煎茶岭式金矿的矿石铅同位素平均值比围岩要小 ,铅同位素曲线的低峰区往往就指示矿体所在 ;预测区的2 0 6Pb/ 2 0 4 Pb、2 0 8Pb/ 2 0 4 Pb比值变差椭圆图的形状和轴向斜率与已知矿区趋于一致 ,并且两者的变差椭圆图形大部分重叠 ,说明存在有同类型金矿体。以上研究成果为同期或后来的勘探工作或矿山采矿所验证。

METHODS OF FAST LOCALIZATION PREDICTION OF SOME IMPORTANT TYPES OF GOLD DEPOSITS

On the basis of the metallogenic geological background, new technologies and methods for prognosis of the three important types of gold depositsBaguamiao, Shuangwang and Jianchaling, in the Qinling region, western China are presented in this study. Gold contents vary in positive correlation with the absorbed hydrocarbon contents in the Baguamiao-type gold deposits. The correlation coefficient is larger when the scale of the gold deposit is bigger. We can predict the blind deposit and its scale in terms of absorbed hydrocarbon contents of quartz veins. Primary halos of the Shuangwang-type gold deposits are obvious. The head hole is composed of B, As, Sb and Hg; near-ore hole, Au and Ba(-); and the tailing hole, Mn and Bi. According to the primary overprint halos in the vertical direction in the Shuangwang- and Baguamiao-type gold deposits, their gold orebodies extend downward to a great depth and there are blind orebodies at depth. The lead isotopic composition of the ore is less variable than that of the wall rocks-dolomite and ultrabasic rocks in the Jianchaling-type gold deposits. The lowest part of the lead isotope curve is always indicative of the position of gold orebody. If the elliptical variance charts of {{}+{206}Pb}/{{}+{204}Pb} and {{}+{208}Pb}/{{}+{204}Pb} ratios between the typical deposit and the metallogenic area overlapped, similar types of gold bodies would be found. All the results have been validated by ore prospecting and mining production.