内蒙古曹四夭钼矿物化探异常特征研究

Research on geophysical and geochemical characteristics of Caosiyao molybdenum deposit in Inner Mongolia

内蒙古自治区曹四夭大型钼矿,为隐伏矿体,矿床类型为斑岩型,矿床成因与深部隐伏斑岩体密切相关。该区开展综合物化探工作,取得了显著的找矿效果,化探形成以Mo为主的Mo、W、Sn、Bi、Cu、Pb、Zn、Ag、As、Sb多元素组合异常,元素具水平分带特征,高温元素为异常内带,中低温元素为中外带,大比例尺化探Mo多金属组合异常区直接指示赋矿区域。大比例尺物探异常突出特点是形成中部低重、低磁、低阻,外围高重、高磁、高阻的环状或似环状重、磁、电异常,环形异常中心部位对应赋矿地段。赋矿地段对应高视幅频率异常。

Caosiyao molybdenum deposit in Inner Mongolia,which is concealed ore body,is a large-sized porphyry molybdenum deposit and is related to the concealed porphyry bodies.The comprehensive geophysical and geochemical work in this area achieved good prospecting effect.Trough geochemical exploration,it showed Mo、W、Sn、Bi、Cu、Pb、Zn、 Ag、 As、Sb elements combination anomaly which is given priority to Mo element anomaly.Anomalous element shows horizontal zoning characteristics that high temperature elements are located in inner of the anomaly belt,medium and low temperature elements around.Mo metal combination anomaly zone in large scale geochemical exploration is ore-bearing zone.Large scale geophysical exploration results shown significant ring-shaped gravity,magnetic,resistivity anomalies that low gravity,medium and low magnetic and low resistivity anomalies in central,high gravity,high magnetic and high resistivity anomalies around.The central area of this ring-shaped anomaly is where ore body occurrence.And the location of ore body shows high apparent frequency anomaly.