摘要:
长山壕金矿床产于白云鄂博群暗色板岩中,属于变质岩型,寻找周边相似地质条件下的金矿是亟待解决的问题.应用1:5万航放、航磁数据,获得金矿区比鲁特组矿化暗色板岩空中钾(K)含量2.64%,铀(U)含量2.65×10-6、钍(Th)含量(10.2~13.5)×10-6,相对背景值,具有 "高铀、高钍、低钾"的航放特征信息,总计数率、U、Th高值信息和金矿生成环境密切相连;金矿区航磁场具有北东向高磁异常带特征,叠加的磁异常幅值在200~600 nT间,航磁信息反映的是对金矿成矿有控制作用的隐伏岩体信息.应用航放、航磁信息,运用矿床特征法对长山壕金矿床周围金矿找矿方向进行了预测,长山壕金矿的东北延伸带是下一步金矿找矿的重点区域,预测结果在金矿找矿中取得了很好效果.
Abstract:
The gold deposit possesses particular geophysical characteristics.On the basis of its characteristics and ore-forming geological environment,the authors point out the prospecting direction,thus improving the results and getting greater achievements in gold prospecting by using the geophysical survey data.The Changshanhao gold deposit occurs in dark slate in Baiyun Obo Group and belongs to metamorphic rock type gold deposit.Applying 1:50,000 aviation radioactivity measurement and aeromagnetic data,the authors obtained the aerial survey potassium content of 2.64%,uranium content of 2.65×10-6 and thorium content of 10.2~13.5×10-6 in mineralized dark slate layer of Bilute Group.Compared with the background value,the layer possesses "high uranium,high thorium,low potassium" characteristics.The high value information of total count rate,U and Th is closely related to the gold-forming environment.The aeromagnetic field in the gold deposit has high aeromagnetic anomaly zones in NE direction,and there exist superimposed magnetic anomalies in the range from 200 to 600 nT.Aeromagnetic information contains the hidden rock mass information which is related to and controls the gold deposit,and the prospecting work was conducted in the gold prospecting areas around the Changshanhao gold deposit by using the deposit characteristic method.11 promising areas were delineated along the northeastward extension gold belt,thus obtaining satisfactory achievements in gold prospecting by using the geophysical survey data.
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