Mapping cation exchange capacity using a quasi-3d joint inversion of EM38 and EM31 data

•Separate LR could not be developed between ECa and measured CEC at different depths.•Combined EM38 and EM31 ECa were inverted by a quisi-3d joint-inversion algorithm.•A universal LR model was built to predict CEC at various depths using inverted electrical conductivity.•CEC was mapped at various de...

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