安徽宁国石口地区土壤地球化学异常特征及评价

文章分析了安徽宁国石口地区土壤地球化学异常特征并对单元素进行异常评价,发现Cu、Pb、Zn、Bi和Sn异常较弱,Ag、W、Mo异常次之,Ag、W、Mo在黑色岩系具有较高的背景值;Au、As、Sb异常面积大、强度高,异常套合较好,各元素之间具有较好的亲和性;Au为富集元素,变异系数较大,反映矿化不均匀,深部已发现工业金矿体,与构造破碎带有关,与硅化、黄铁矿化呈正相关。通过土壤地球化学测量,在研究区圈定了19个Au异常,3条Au异常带。对异常进一步验证,发现NW向金异常带AuP3异常具有较好的找矿前景。NE向异常带中的AuP1异常和AuP2异常,可能为寒武纪西阳山组钙质泥岩风化导致Au次生富集引起的异常。

Characteristics and evaluation of soil geochemical anomalies inthe Shikou area in Ningguo City,Anhui Province

This study analyzed the characteristics of geochemical anomalies for soil from the Shikou area in Ningguo City,Anhui Province,and evaluated the anomaly of each element.The results show weak anomalies in Cu,Pb,Zn,Bi and Sn,and mean anomalies in Ag,W and Mo,but black rock series has relaitively high background values in Ag,W and Mo.Au,As and Sb elements present large areas with strong anomalies,and well coupled correlation among anomalous areas.Each element shows a relatively good affinity.Gold is an enriched element with a large variation coefficient,indicating uneven mineralization.Industrial gold-bearing orebodies found at depth in the study area may be associated with structural fracture belt,and have positive relationship with silicification and pyritization.Soil geochemical survey deliminated 19 anomalous points and 3 anomaly belts of Au element in the study area,and further confimation on anomalies discovered that the NW-trending Au anomalous belt AuP3 is of good prospecting potential.AuP1 and AuP2 anomalies within the NE-trending belt might have been the product of gold secondary enrirchment resulted from weathering of calcareous mudstone of the Cambrian Xiyangshan Formation.