CHARACTERIZATION BY DIFRACTOMETRY OF TURMALINE POWDERS IN GREISENIZED GRANITES FROM THE PINOS EARTH AND ITS WITH METALOGENY RELATIONSHIP
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Abstract
The results obtained from the recently concluded IGP-SGC project: "Characterization of tourmaline in greisenized granites of the pine land and associated metallogenesis", through the use of powder diffractometry (XRD) as well as mineralogical and petrographic analysis, showed that in granite greisenized from the “Las Nuevas” sector, the tourmalines present a composition close to that of “oxychorlo” -oxyfoitite ”, associated in turn with possible mineralization of Sn and other rare and dispersed accompanying elements such as Nb, Ta, W, Mo and Li. On the other hand, in the greisenized granite regoliths of the “Santa Elena” sector, it was obtained that the tourmalines present very similar diffraction patterns so in angular position and interplanar distance to intermediate solid solutions of the “dravite - magnesiofoitite” series and, likewise that in the “Las Nuevas” greisen, they are related to greisen-type deposits of Sn, with accompanying W, Mo, Nb and Ta, although it should be noted that the probable association of these species with porphyry Cu-type deposits is also not ruled out . The above supports the hypothesis formulated in the text of the explanatory memory of the Metallogenic Map of Cuba at a scale of 1: 250,000, related to the geological favorability of said territory for the discovery of new occurrences of Sn, W, Mo, Li and other elements. companions in these types of rocks, within which the porphyries are also included in the example of the complex zoned deposit of W-Mo-Cu "Lela", in which carrier phases were also detected to a lesser extent by SEM-EDS of rare elements and dispersed such as Bi, ETR, U and Th respectively.
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