FIRST-ROW TRANSITION ELEMENTS, Y AND Ga IN KIMBERLITE AND LAMPROITE: APPLICATIONS TO DIAMOND PROSPECTIVITY AND PETROGENESIS
作者： T. C. Birkett
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摘要: Whole-rock magmatic compositions of hypabyssal-facies samples from on-craton kimberlites predict diamond prospectivity. Within a database some 100 worldwide, 88% occurrences are correctly assigned using Ti, Cr, Ni and Y whole-rock concentrations. Prospective show lower Y, Ga, Mn, Fe, Sc, Zn, V Cu, higher Cr than non-prospective, otherwise similar rocks. Magnesium, more abundant in prospective occurrences, can also be used to distinguish these two groups, although lesser extent. Similar differences, excepting observed between diamondiferous (prospective) non-diamondiferous (non-prospective) lamproites. These distinctions result differences both groundmass suspended-load Differences oxygen fugacity attending the genesis evolution kimberlitic magma most likely contribute distinct compositions, other factors such as presence source regions pressure temperature conditions probably well.
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