Rare-metal mineralization related to bituminous matter in late assemblages of pegmatites at Khibiny and Lovozero massifsстатья

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[1] Rare-metal mineralization related to bituminous matter in late assemblages of pegmatites at khibiny and lovozero massifs / N. V. Chukanov, V. N. Ermolaeva, I. V. Pekov et al. // New Data on Minerals. — 2005. — Vol. 40. — P. 80–95. The mineral composition and structure of microheterogeneous aggregates from the lowtemperature assemblages, containing solid bituminous matters (SBM), from the Khibiny and Lovozero massifs have been studied. It is shown that thin intergrowths of SBM with the rare elements minerals are the typomorphic formations of hydrothermal zones of agpaitic pegmatites of these massifs. 4 types of such intergrowths are distinguished, which are characterized by different mineralogical composition, high content of rare elements, and extremely high degree of separation of Ce, La, Nd, Y, Sr, Th, U, Ti, Nb, and Ba between different phases, right up to the formation of proper minerals of these elements. Not only new mineral species for Khibiny and Lovozero but also a whole number of phases that do not have analogues among known minerals were found. The possible mechanisms of formation of microheterogeneous aggregates containing SBM and a role of complexes with organic compounds in the transportation of rare elements at low temperatures are discussed. 4 tables, 9 figures, 28 references.

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