多拉纳萨依金矿次生异常模式及找矿意义

SECONDARY ANOMALY MODEL OF DUOLANASAYI GOLD DEPOSIT AND THE SIGNIFICANCE TO EXPLORATION

多拉纳萨依金矿位于哈巴河—克兰华力西弧后盆地,是芮行健等以地质与化探综合方法找到的赋存于中泥盆统不纯灰岩与碎屑岩之间的层间断裂内,并与沿这些断裂侵入的斜长花岗岩脉密切相关的破碎带蚀变岩型金矿床.地球化学指示元素次生分散数学模型为;线形Au异常规模大、延伸达10多公里,并与反S形构造相吻合,其浓集中心清楚,峰值大于3g/t,明显反映金矿体的存在;Zn、Pb、As和Bi等异常规模大,而且也呈线形分布,并与Au异常相对应;相关分析表明,Pb、Zn、Bi和As分别与Au相关;因子分析结果,Au呈独立因子,而Pb、Zn和Tl构成一个因子。

Duolanasayi gold deposit, located in the Habahe-Kelan variscian back are basin, found out by Rui Xinjian etc. with the comprehensive approaches of geology and geochemical prospecting, is a fracture zone-altered rock type gold deposit which exists in the in informational faults between the impure limstones and clastic rocks of the middle Devonian and is closely related to the plagioclase granite dikes intruded along these faults. The mathematical model of the secondary despersion for geochemical indicator elements is expressed as y=a+bekx2 . The linear gold anomaly is large in scope with an extension of more.than ten kilometers and, coincides with the rough sketch of the reversed S-shaped structure. The clear concentration center of Au anomaly has a peak of more than 3 g/t, and reflects obviously the occurence of gold orebody. The anomalies of Zn, Pb, As and Bi with large scope are also linear in spatial distributions and coincide with that of Au anomaly. The result of correlation analysis shows that Pb, Zn, Bi and As is correlative with Au, respectively. The result derived from factor analysis is that Au is an independent factori Pb, Zn and Tl construct a common factor.On the basis of the features of secondary anomalies, we put forward some suggestions for the further investigations , found out many new gold orebodies in Akesayi and Butuobieshan, respectively, therefore enlarged greatly Duolanasayi gold reserves.