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Introduction to this special section: Potential fields
Joint inversion of gravity and gravity gradient data: A systematic evaluation
Three-dimensional controlled-source electromagnetic forward modeling by edge-based finite element with a divergence correction
Understanding the information content in gravity gradiometry data through constrained inversions for salt bodies
Time-lapse electromagnetic and gravity methods in carbon storage monitoring
A paradigm shift in magnetic data interpretation: Increased value through magnetization inversions
Integrating time-lapse gravity, production, and geologic structure data in a gas reservoir study
Integrated interpretation of gravity, magnetic, seismic, and well data to image volcanic units for oil-gas exploration in the eastern Junggar Basin, northwest China
Constraining magnetic amplitude inversion with magnetotelluric data to image volcanic units: A case study
Joint inversion of surface and borehole magnetic data: A level-set approach
Magnetization clustering inversion — Part 2: Assessing the uncertainty of recovered magnetization directions
Geology differentiation: A new frontier in quantitative geophysical interpretation in mineral exploration
Quantifying the error level in computed magnetic amplitude data for 3D magnetization inversion
Magnetization clustering inversion — Part 1: Building an automated numerical optimization algorithm
Discrete-valued gravity inversion using the guided fuzzy c -means clustering technique
Understanding curvatures of the equipotential surface in gravity gradiometry
Shared advances in exploration and fundamental geophysics — Introduction
Removal of galvanic distortion effects in 3D magnetotelluric data by an equivalent source technique
Regional- to Deposit-Scale Geologic Controls on Copper-Silver Mineralization in the Kalahari Copperbelt, Botswana
Abstract The Kalahari Copperbelt in northwestern Botswana is characterized by structurally controlled, stratabound, mineralogically zoned copper-silver deposits hosted along a major redox boundary within a late Mesoproterozoic rift succession. Copper-silver mineralized rocks occur on the limbs and in the hinge positions of regional-scale folds that characterize the Pan-African Ghanzi-Chobe zone fold-and-thrust belt. Regional facies changes along the base of the transgressive marine D’Kar Formation, the host to the majority of mineralized rocks, delineate a series of synsedimentary basin highs and lows. The facies changes were identified through both lithostratigraphic analysis of drill holes and along-strike variations in magnetic lithostratigraphy, a technique that correlates the magnetic fabrics of second vertical derivative aeromagnetic maps with changes in lithostratigraphy. Basin highs controlled the development and distribution of favorable lithostratigraphic and lithogeochemical trap sites for later sulfide precipitation. Major facies changes across the Ghanzi Ridge area straddle a significant crustal structure identified in gravity datasets that appears to have influenced extensional activity during basin development. During basin inversion, the basin highs, cored by rheologically stronger bimodal volcanic rocks, localized strain within mechanically weaker rock types of the Ghanzi Group metasedimentary rocks, leading to the development of locally significant permeability and the formation of structural trap sites for mineralization by hot (250°–300°C), oxidizing, metalliferous Na-Ca-Cl brines. Structural permeability was maintained within trap sites due to silicification and/or feldspar alteration during progressive deformation and associated hydrothermal mineralizing events.