Gravity and magnetic anomalies characteristics of rock bodies and ore-prospecting orientation in the southeast of Hubei Province
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摘要: 鄂东南地区的中酸性侵入岩与区域成矿关系密切.根据研究区岩矿石物性和地质上设想的模式,建立多种识别信息的地质-地球物理模型与识别标志,并以实际资料检验所建立模型的正确性.利用小波多尺度分解提取研究区重磁异常弱信号,对比理论模型和已知岩矿体与不同尺度局部重磁异常的组合关系,得出大尺度细节中的局部低重高磁异常是岩体的反映、高重高磁异常是较大规模矿化体的反映,小尺度细节中的局部高重高磁异常是矿化体引起的结论,并圈出13个可能存在隐伏岩体、矿(化)体的低重高磁、高重高磁异常区域.通过研究灵乡地区已知见矿钻井大多对应局部高重高磁的异常特征,推断螺丝山、ZKI01孔与陈家山头构成一北东向局部高重高磁异常带、狮子山与玉屏山环状局部高重高磁异常带和柯家湾南部的局部高重力异常带是进一步工作的方向.Abstract: There exists close relationship between intermediate-acid intrusive rock and regional mineralization in the southeast of Hubei Province.According to the features of rock bodies and geophysical properties of the ores and the model put forward by geologists, the authors set up a geological-geophysical model which is characterized by multi-identifying information and identifying mark.And then, the authors used actual data to prove it.The authors extracted weak local gravity and magnetic anomalies to compare theoretical model's combination with local gravity and magnetic anomalies on different scales with the effect of the theoretical model through wavelet multi-scale decomposition, from which the authors have drawn the conclusion that low gravity-high magnetic local anomalies are caused by rocks, whereas high gravity-high magnetic local anomalies are caused by large scale mineralized body on large scale details;high gravity-high magnetic local anomalies are caused by mineralized body on small scale details.On such a basis, the authors delineated 13 low gravity-high magnetic local anomalies and high gravity-high magnetic local anomalies areas which may have concealed rock bodies or mineralized bodies (orebodies).The authors infer that the northeast high gravity-high magnetic local anomaly stripe of Luosishan-ZKI01-Chenjiashantou, the ringlike high gravity-high magnetic local anomaly of Shizishan-Yupingshan and the high local gravity anomaly are further ore-prospecting targets, as shown by the features of known drill holes' relation to high gravity-high magnetic local anomalies.
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