The Koh Safi Chromite Ore Deposit is located in Afghanistan’s northern–northeastern end of the Kabul–Kandahar ophiolite zone. Sedimentary formations, delayed volcanic, and ultramafic rock groups, including peridotites and serpentinites, could all have been found in the Koh Safi area, where structural discontinuities with the two trends of northwest–southeast and east–west can be identified. High-grade serpentinite units have many chromite deposits, whereas peridotite has a lot of medium-grade deposits. This paper performs a ground magnetic data analysis based on structural analysis and 3-D susceptibility inversion. The boundaries of structural faults and anomalous bodies are likely delineated in a northwest-to-southeast orientation using a series of derivative maps, including Total Horizontal Derivative, Analytical Signal, and Theta Map. For inversion, many regularization norms that included the range of smooth, intermediate, and compact models were used to examine a particular susceptibility value that occurred in a model cell. The sparse and blocky norms [0,1,1,1] were suggested for our inversion in field data based on synthetic data to determine an appropriate norm. A 3-D inversion of ground magnetic data shows that the highly magnetic zone supposed to be the host rocks seems to be where chromite occurs in the study area.

中文翻译：

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基于地面磁数据的构造分析和磁化率反演绘制铬铁矿资源图：以阿富汗帕尔旺 Koh Safi 铬铁矿矿床为例

Koh Safi 铬铁矿矿床位于阿富汗喀布尔-坎大哈蛇绿岩带的北部至东北端。沉积岩、迟发火山岩和超镁铁岩群，包括橄榄岩和蛇纹岩，都可能在 Koh Safi 地区发现，那里可以识别出西北-东南和东西向两种走向的结构不连续性。高品位蛇纹岩单元有许多铬铁矿矿床，而橄榄岩有许多中品位矿床。本文基于结构分析和3-D磁化率反演进行了地面磁数据分析。构造断层和异常体的边界可能是使用一系列导数图（包括总水平导数、分析信号和 Theta 图）以西北到东南方向描绘的。对于反演，使用包括平滑、中间和紧凑模型范围的许多正则化规范来检查模型单元中出现的特定磁敏度值。建议使用稀疏和块状范数 [0,1,1,1]，用于基于合成数据的现场数据反演，以确定适当的范数。地面磁数据的 3-D 反演表明，被认为是母岩的强磁区似乎就是研究区域铬铁矿的产地。