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首页> 外文期刊>Exploration Geophysics >Investigation of auriferous mineralisation over greenstone schist belt of Dhanjori Basin, Eastern India using 2D electrical resistivity tomography and induced polarisation surveys
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Investigation of auriferous mineralisation over greenstone schist belt of Dhanjori Basin, Eastern India using 2D electrical resistivity tomography and induced polarisation surveys

机译：利用2D电阻率断层扫描和诱导极化调查，达坎河盆地绿石矿区绿石矿化腰带调查

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Dipole-dipole resistivity and induced polarisation (IP) surveys were conducted over a conductor identified from an audiomagnetotelluric (AMT) survey run in a greenstone schist belt of the Dhanjori Basin, Eastern Singhbhum, India. The shallow conductors identified in the AMT were not well resolved due to insufficient high-frequency data. The geology of the area suggests that gold mineralisation is associated with quartz pebble conglomerates (QPC) or sulfides. The resistivity and IP surveys were conducted over an area of 1.2 x 0.4 km with an electrode spacing of 10 m and a line spacing of 50 m. This data set was inverted using Gauss-Newton optimisation. Based on the resistivity and IP results, responses were categorised into five distinct geological/geophysical signatures defining local lithology and associated mineralisation. Low resistivity and low to moderate chargeability at depths up to 20 m from the surface indicate the weathered zone (which is not a strong feature in some of the IP models). High resistivity and high chargeability zones are identified as quartz vein/QPC with disseminated sulfide +/- auriferous concentrations. Moderate resistivities and chargeabilities are interpreted as being related to the greenstone schists that make up the major part of the geology in the Dhanjori Basin. Zones with high resistivity and low chargeability are interpreted as Proterozoic gabbroic anorthosite ultramafics (PGAU) and/or younger dolerites. PGAU is intrusive to the local greenstone schist/phyllites; we have observed that its resistivity is considerably high and there is no significant gain in its chargeability due to the hindrance in ionic and electronic movement in the formation. Low resistivity and low to moderate chargeability zones below the weathered layer are attributed to mineralisation associated with massive sulfides. The integrated geophysical study indicates the presence of quartz vein/QPC and sulfide hosting auriferous mineralisation over the greenstone schist belt of the Dhanjori Basin, Eastern Singhbhum.
机译：偶极偶极电阻率和诱导极化（IP）调查是在印度Dhanjori盆地的Greenstone Schist腰带中识别的一条识别的导体上进行的导体。由于高频数据不足，AMT中识别的浅导体并不良好地解决。该地区的地质表明，金矿化与石英卵石集团（QPC）或硫化物相关。电阻率和IP调查在1.2×0.4km的面积上进行，电极间距为10米，线间距为50μm。使用Gauss-Newton优化反转此数据集。基于电阻率和IP结果，响应被分为五个不同地质/地球物理签名，定义局部岩性和相关矿化。低电阻率和低于距离表面的深度高达20米的较低的电阻率，指示风化区域（在某些IP模型中不是强大的特征）。高电阻率和高充电能力区域被鉴定为石英静脉/ QPC，具有散发硫化硫化物+/-纤维酸浓度。适度的电阻和充电能力被解释为与绿石分类有关，弥补了达坎里盆地地质的主要部分。具有高电阻率和低充电能力的区域被解释为正常古代Gabbroics ImportMAFICS（PGAU）和/或更年轻的Dolerites。 PGAU对当地的Greenstone Schist / Phyllites具有侵入性;我们观察到其电阻率相当高，并且由于在地层中的离子和电子运动的障碍而没有显着的收费增益。低电阻率和低于风化层下方的适度充电能力区归因于与大规模硫化物相关的矿化。综合地球物理研究表明，在达坎滨盆地东部Singhbum东部的Greenstone Schist腰带上存在石英静脉/ QPC和硫化灭绝的硫化物。

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