The North Singhbhum Mobile Belt (NSMB) lies between two crustal-scale shear zones, the South Purulia Shear Zone (SPSZ) at the north, and the Singhbhum Shear Zone (SSZ) at the south. The Babaikundi-Birgaon Axis (BBA) is an east-west trending secondary shear zone in the NSMB lying south of SPSZ, which is known for the occurrence of gold along with other sulfide minerals within the quartz reefs. The present study has been carried out at north of Ichadih village, which lies on the BBA. The present study attempts combined electrical resistivity tomography (ERT) and self-potential methods along a profile of 470-m length in the Ichadih area to map the potential mineralized zones. Initially, ERT sections generated by Wenner, Wenner-Schlumberger, dipole-dipole, and joint inversion of the combined array have been analyzed, and results are validated through the analysis of model resolution. A prominent low resistivity (10–100 Ωm) associated with quartz reef/limonitic quartz reef at a depth of approximately 30–85 m, encircled by a high resistive (more than 10,000 Ωm) formation associated with metasedimentary rock, has been delineated using joint inversion of the combined array. Further, analysis of self-potential (SP) anomaly using particle swarm optimization inversion also confirms the prominent low SP anomaly at a depth of 77.3 m, which is analogous to the low resistivity anomaly identified in the joint inversion of the combined geo-electric array. Subsequent analysis of a complex synthetic geo-electrical model analogous to the present field situation proves the efficacy of the joint inversion of combined arrays. As a whole, joint inversion of multi-array data is established as an efficient technique for better subsurface imaging in case of the complex subsurface structure. In-depth analyses confirm the possibility of sulfide mineral-rich deposit (quartz reef/limonitic quartz reef) which requires further geological drilling and lithogeochemical sample analysis, for possible future exploration.

中文翻译：

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使用电阻率层析成像和自电位方法绘制印度北辛格布移动带 Ichadih 的金矿化图

北辛格布移动带（NSMB）位于两个地壳尺度剪切带之间，北部是南普鲁利亚剪切带（SPSZ），南部是辛格布姆剪切带（SSZ）。Babaikundi-Birgaon 轴心 (BBA) 是位于 SPSZ 以南的 NSMB 中一个东西走向的次生剪切带，以在石英礁内发现金和其他硫化物矿物而闻名。目前的研究是在位于 BBA 的 Ichadih 村北部进行的。本研究尝试沿 Ichadih 地区 470 米长的剖面结合电阻率断层扫描 (ERT) 和自电位方法来绘制潜在的矿化带。最初，分析了由 Wenner、Wenner-Schlumberger、偶极-偶极子和组合阵列的联合反演生成的 ERT 截面，并通过模型分辨率分析验证结果。一个突出的低电阻率（10-100 Ωm）与石英礁/褐铁矿石英礁相关，深度约为 30-85 m，被与变质沉积岩相关的高电阻（超过 10,000 Ωm）地层包围，已使用节理组合数组的反转。此外，使用粒子群优化反演对自电位（SP）异常的分析也证实了在 77.3 m 深度处的显着低 SP 异常，这类似于在组合地电阵列联合反演中识别出的低电阻率异常. 随后对类似于当前现场情况的复杂合成地电模型的分析证明了组合阵列联合反演的有效性。总的来说，在复杂的地下结构情况下，多阵列数据的联合反演被确立为一种有效的技术，可以更好地进行地下成像。深入分析证实了富硫化物矿床（石英礁/褐铁矿石英礁）的可能性，需要进一步的地质钻探和岩石地球化学样品分析，以供未来勘探。