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Minerals of ore and gangue show large differences in minor-element content between districts, and within districts and individual paragenetic sequences. Ore from the fluorite district is characterized by greatest abundance of minor elements, large fractionation of Ag between galena and sphalerite, and low Sb/Ag in galena. Sb and Ag, concentrated in galena, show marked district zonal pattern. Sphalerite is high in Cd, Ga, and Ge. In the Upper Mississippi district, minor elements are less abundant and Ag concentrated in sphalerite. 'It is concluded that the minor elements were largely leached from the basement by convective circulation of heated oilfield brine.'
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M.O. Schaefer, J. Gutzmer, N.J. Beukes, and L.N. Greyling Mineral chemistry of sphalerite and galena from Pb-Zn mineralization hosted by the Transvaal Supergroup in Griqualand West, South Africa South African Journal of Geology, September 1, 2004; 107(3): 341 - 354. [Abstract] [Full Text] [PDF] |
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