Abstract:The Nb-Ta contents of wolframite seem to be one of the major indicators in genesis study and mineral exploration of tungsten deposits. Tungsten deposits related genetically to continental volcanism-subvolcanism, marine volcanic exhalation-hot spring precipitation, hydrothermal infiltration-metasomatism or sedimentation-transformation obviously contain much less Nb and Ta than various ore deposits pertaining to metallogenic series of granites. The variation in Nb-Ta contents of wolframite shows a decreasing tendency from early to late stage and from parent rock to country rock. The investigation of six typical deposits and the correlation analysis and R-factor analysis of data acquired from 30 deposits suggest the presence of positive correlation between Nb and Ta in wolframite with different deposits exhibiting diverse degree of such correlation, and the nonexistence of correlation between Nb, Ta and Mn, Fe. The mineral facies analysis, electronic microprobe scanning and the determination of residue reveal that Nb and Ta are predominantly evenly distributed in wolframite in the form of isomorphism with a probable minor amount present in Columbite-tantalite and microlite as micro-inclusions. The variation in Nb-Ta content of wolframite depends principally on the concentration of Nb5+ and Ta5+ during the crystallization of wolframite. The characteristics of Nb-Ta contents of wolframite and the regularity of their variation might find applications in two aspects: to determine the genetic relations between ore veins in granites and their country rocks and to predict the extension of ore veins.
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章崇真.1984.黑钨矿中铌钽含量变化的研究及意义[J].矿床地质,3(2):59~67.1984.Variation in Nb-Ta Contents Of Wolframite And Its Significance As An Indicator[J].Mineral Deposits3(2):59~67
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