An exploration method for the radiation of ion adsorption-type rare earth element deposits based on multi-channel gamma-ray spectrometry:A case study of the Dechang area in the Panzhihua-Xichang region
The Mianning-Dechang rare earth element(REE)metallogenic belt exhibits considerable resource potential.Previous pros-pecting was oriented to hard-rock REE deposits associated with Himalayan alkaline complexes,with ion adsorption-type REE deposits under-studied.To explore the mineralization prospect of granite weathering crusts widespread in the metallogenic belt,this study inves-tigated the Shizishan area through multi-channel gamma-ray spectrometry,soil profile survey,and shallow drilling.One ion adsorption-type REE ore occurrence was identified in the granite weathering crust at Mosuoying.This study analyzed the radioactive response of the geological,geophysical,and geochemical profiles and ore contents,finding that the elemental contents of thorium(Th)and potas-sium(K)were highly indicative of REE and rare metal mineralization.Highly mineralized,industrial-scale ion adsorption-type REE deposits will likely occur when 6.25<w(Th)/w(K)<10,w(eTh)>37×10-6,and w(eK)>4.2%.As revealed by the analysis of the response of radioactive anomalies to supergene weathering,thorium anomaly halos can effectively indicate granitic plutons while potassi-um anomaly halos can well delineate the extent of granite weathering crusts.
gamma-ray spectrometryion adsorption-type REE depositniobium-tantalum mineralizationsupergene weatheringDechang area in the Panzhihua-Xichang region
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