摘要
道郎和都格矿区地表沙土和草原覆盖严重,直接寻找钨多金属矿的信息较少。地质地球化学研究结果表明,与钨多金属矿关系密切的是早白垩世钾长花岗岩,赋矿围岩主要是二叠纪辉石闪长岩。根据围岩与矿体之间的物性差异,完成了矿区1∶1万地质填图、磁法和重力测量,对数据进行重磁联合反演,识别出3条走向北东、长度800~3 000m、宽度50~100m的重要的构造蚀变带(分别对应于负磁异常带),均分布在矿区西北侧的辉石闪长岩中,且平行于辉石闪长岩和钾长花岗岩的接触带。预测了6个综合物探异常区,也位于矿区西北侧的辉石闪长岩分布区,单个异常面积为500 800m2,异常深度不超过1 000m。经钻探工程验证,在3个异常部位发现了隐伏的构造破碎带型钨多金属找矿靶区,钨多金属矿体埋藏深度为150~650m,单个矿体厚度为2~4m。表明成矿地质条件分析与重磁联合反演相结合的定位预测方法,在覆盖区寻找钨矿效果明显,值得进一步推广。
Due to much covering by sand and grass,there is less mineralization information on the ground in Daolangheduge tungsten-polymetallic mine.Geological and geochemical studies show that the Early Cretaceous K-feldspar granite closely correlates to tungsten mineralization,while the ore-hosting rock is chiefly the Permian augite diorite.According to the difference of physical property between host rock and ore body,the geological mapping,magnetic and gravity survey at scale of 1∶10 000 have been completed in the deposit.By integrated gravity-magnetic inversions of data,three NE-trending important structural alteration zones are identified in augite diorite occurring in the northwestern part of the deposit,which correspond to negative magnetic anomalies,respectively.Parallel to the boundary between augite diorite and K-feldspar granite,the three zones have the length of 800-3 000 m and the width of 50-100 m.As a result,six integrated geophysical anomalies are predicted in augite diorite.The depth of anomalies does not exceed 1 000 m and the area of a single anomaly is usually 500 800 m2.Through drilling,three blinded fractured-zone type tungsten-polymetallic exploration targets are discovered.Tungsten-polymetallic ore bodies are sited in the depth of 150-650 m.The thickness of the ore body is 2-4 m.The combination method of regional metallogenic condition analysis and integrated gravity-magnetic inversions is confirmed to be effective for forecasting tungsten deposit in covered area and worth to being applied in other region.
出处
《吉林大学学报(地球科学版)》
EI
CAS
CSCD
北大核心
2011年第6期1959-1967,共9页
Journal of Jilin University:Earth Science Edition
基金
'十一.五'科技支撑计划重大项目(2006BAB01A02)
关键词
覆盖区
钨多金属矿
磁法
重力
综合定位预测
covered area
tungsten-polymetallic deposit
magnetism
gravitation
integrated positioning forecasting