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<p>This study applies a robust Electrical Resistivity Tomography (ERT) and Time-Domain Induced Polarization (TDIP) geophysical workflow to delineate the geometry and assess the quality of a marble deposit in the Zagros Fold-Thrust Belt. The method utilizes an unstructured triangular mesh and a sequential inversion scheme, implemented via the open-source pyGIMLi library. It is validated against a synthetic model, that accurately incorporates rugged topography. Field data, acquired using a mixed Dipole-Dipole and Pole-Dipole array, were successfully inverted, resulting in low misfit. The models derived from sequential inversion of ERT and IP data accurately delineate the marble unit by its high electrical resistivity, mapping a variable thickness between 10 and 30&#xa0;m. Critically, the resistivity contrast revealed zones of superior, less-fractured marble quality on the southern slope compared to the macadamized material on the mountain ridge. The methodology successfully provided geometrical parameters and a qualitative assessment of rock competence, proving ERT/IP suitable for resource evaluation in high-topography settings. The results strongly support directing future exploration efforts, including exploratory drilling, toward the high-resistivity zones identified on the southern slope.</p>

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Geophysical imaging of marble stone quarry through the sequential inversion of DC resistivity and time-domain induced polarization data utilizing unstructured triangular meshing

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Amir Yazdanpanah,
  • Maysam Abedi

摘要

This study applies a robust Electrical Resistivity Tomography (ERT) and Time-Domain Induced Polarization (TDIP) geophysical workflow to delineate the geometry and assess the quality of a marble deposit in the Zagros Fold-Thrust Belt. The method utilizes an unstructured triangular mesh and a sequential inversion scheme, implemented via the open-source pyGIMLi library. It is validated against a synthetic model, that accurately incorporates rugged topography. Field data, acquired using a mixed Dipole-Dipole and Pole-Dipole array, were successfully inverted, resulting in low misfit. The models derived from sequential inversion of ERT and IP data accurately delineate the marble unit by its high electrical resistivity, mapping a variable thickness between 10 and 30 m. Critically, the resistivity contrast revealed zones of superior, less-fractured marble quality on the southern slope compared to the macadamized material on the mountain ridge. The methodology successfully provided geometrical parameters and a qualitative assessment of rock competence, proving ERT/IP suitable for resource evaluation in high-topography settings. The results strongly support directing future exploration efforts, including exploratory drilling, toward the high-resistivity zones identified on the southern slope.