内蒙古呼扎盖吐钼矿床物化探异常特征及找矿效果

摘要

The Huzagaitu porphyry-type molybdenum deposit was found by verifying the geophysical-geochemical anomalies, and the ore bodies mainly occur near the contact zone between the early Yanshanian fine-grained granite and the middle Ordovician Hanwula rhyolite.In the mining area, the geophysical and geochemical anomalies have a good combination and a clear hierarchical structure around the granite body.The center of the anomaly is a positive high magnetic field, and outwards there are in succession negative low magnetic field and soil anomaly area, positive low magnetic field and IP anomaly area, and negative normal magnetic field.The geophysical and geochemical anomalies exhibit a good indication of rocks and ore bodies.The magnetic anomalies reflect the distribution of the orebearing granite rocks and the mineralization alteration zones, the soil anomalies indicate the positions of the molylbdenum ore bodies,and the IP anomalies indicate the locations of the molybdenum ore bodies and the rhyolite rocks with strong pyritization near the contact zone.Some anomalies were verified with trenching and drilling, 3 molybdenum mineralization belts were discovered, and 5 ore bodies and 3 mineralized bodies were found.The controlled molybdenum reserves have already reached the medium size, and the ore deposit is likely to become a large-size ore deposit.%呼扎盖吐钼矿床是验证物化探异常而发现的一座斑岩型矿床,矿体主要赋存在燕山早期细粒花岗岩与中奥陶统汉乌拉组流纹岩内接触带附近.矿区内物化探异常围绕花岗岩岩体分布,套合良好,层次结构清晰,中心部位为正值高磁区,向外依次为负值低磁区及土壤异常、正值低磁区及激电异常、负值正常磁场.物化探异常对岩体及矿体有良好的指示作用,磁异常反映了含矿花岗岩岩体及矿化蚀变分布范围,土壤异常反映了钼矿体赋存部位,激电异常反映了岩体接触带附近钼矿体及强黄铁矿化流纹岩的分布地段.槽探和钻探验证物化探异常已圈出3处钼矿化带,发现5条钼矿体及3条钼矿化体.获得的钼资源量已达中型,矿床具有大型成矿远景.