Corrigendum to “Gravity, aeromagnetic and electromagnetic study of the gold and pyrite mineralized zones in the Haile Mine area, Kershaw, South Carolina”
Corrigendum to “Gravity, aeromagnetic and electromagnetic study of the gold and pyrite mineralized zones in the Haile Mine area, Kershaw, South Carolina”
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DOI：
10.1130/abs/2019se-327424
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发表时间：
2019-03
影响因子：
2
通讯作者：
Saad S. Alarifi;J. Kellogg;E. Ibrahim
中科院分区：
文献类型：
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作者：
Saad S. Alarifi;J. Kellogg;E. Ibrahim
为探测南卡罗来纳州海乐金矿地区的浸染型硫化物，对新的高分辨率重力、电磁和磁测资料进行了测试。地球物理解释受448个钻孔中49,183个样品的密度和矿物浓度测量的限制。光谱分析的剩余重力正异常与矿化成矿带相关。在布格异常的一阶垂直导数和剩余重力的倾斜导数中，观察到正异常与矿带的相似关系。重力场的欧拉反褶积也显示了矿带中大量的浅源。钻芯测量表明，变质岩(Richtex单位)(2.76g/cm3)和含金样品(2.73g/cm3)略高于变火山岩(柿叉组)(2.69g/cm3)。样品密度与矿物含量的相关系数分别为黄铁矿(0.18)和绢云母(0.15)，表明黄铁矿是增加样品密度的主要矿物。受密集钻井约束的二维重力正演模型与欧拉反褶积密度异常的预测深度范围相匹配。钻探结果证实了高密度、高黄铁矿浓度和矿化带之间的空间相关性。在海乐矿带和变质岩上观察到了高电导率异常。岩心钻探和二维反演表明，高导电性异常与黄铁矿高值区相吻合。磁场主要由海乐以北3公里和以西5公里处的花岗岩和北西向侏罗纪辉绿岩脉产生的异常所控制。向东-东北方向的线性异常已被采样并确定为阿勒格尼亚期煌斑岩岩脉，提供了美国东南部这些侵入体的第一张磁图。
Abstract New high resolution gravity, electromagnetic (EM) and magnetic data are tested for the detection of disseminated sulfides in the area of the Haile Gold Mine, South Carolina. Geophysical interpretations were constrained with densities and mineral concentrations measured for 49,183 samples from 448 drill holes. Positive residual gravity anomalies from spectral analysis correlate with the mineralized ore zone. Similar correlations between positive anomalies and the ore zones are observed in the first vertical derivative of Bouguer anomaly and tilt derivatives of the residual gravity. Euler deconvolution of the gravity field also shows numerous shallow sources in the ore zone. Drill core measurements show that metasediments (Richtex unit), (2.76 g/cm3) and gold bearing samples (2.73 g/cm3) are slightly denser than metavolcanics (Persimmon Fork Formation), (2.69 g/cm3). Correlation coefficients for sample density and mineral percentages are pyrite (0.18) and sericite (0.15), indicating that pyrite is the main mineral increasing sample density. 2D forward gravity models constrained by dense drilling match the predicted depth range of density anomalies from Euler deconvolution. Drilling results confirm a spatial correlation between high densities, high pyrite concentrations, and the mineralized zones. High conductivity anomalies are observed over the Haile ore zone as well as over the metasediments. Core drilling and 2D inversion show that high conductivity anomalies coincide with zones of high pyrite concentrations. The magnetic field is dominated by anomalies produced by granite plutons 3 km north and 5 km west of Haile and northwest-trending Jurassic diabase dikes. East-northeast trending linear anomalies have been sampled and dated as Alleghanian lamprophyre dikes providing the first magnetic map of these intrusions in the southeastern United States.