Three-D Mineralogical Mapping of the Kovdor Phoscorite–Carbonatite Complex, NW Russia: I. Forsterite
AbstractThe Kovdor alkaline-ultrabasic massif (NW Russia) is formed by three consequent intrusions: peridotite, foidolite–melilitolite and phoscorite–carbonatite. Forsterite is the earliest mineral of both peridotite and phoscorite–carbonatite, and its crystallization governed evolution of magmatic systems. Crystallization of forsterite from Ca-Fe-rich peridotite melt produced Si-Al-Na-K-rich residual melt-I corresponding to foidolite–melilitolite. In turn, consolidation of foidolite and melilitolite resulted in Fe-Ca-C-P-F-rich residual melt-II that emplaced in silicate rocks as a phoscorite–carbonatite pipe. Crystallization of phoscorite began from forsterite, which launched destruction of silicate-carbonate-ferri-phosphate subnetworks of melt-II, and further precipitation of apatite and magnetite from the pipe wall to its axis with formation of carbonatite melt-III in the pipe axial zone. This petrogenetic model is based on petrography, mineral chemistry, crystal size distribution and crystallochemistry of forsterite. Marginal forsterite-rich phoscorite consists of Fe2+-Mn-Ni-Ti-rich forsterite similar to olivine from peridotite, intermediate low-carbonate magnetite-rich phoscorite includes Mg-Fe3+-rich forsterite, and axial carbonate-rich phoscorite and carbonatites contain Fe2+-Mn-rich forsterite. Incorporation of trivalent iron in the octahedral M1 and M2 sites reduced volume of these polyhedra; while volume of tetrahedral set has not changed. Thus, trivalent iron incorporates into forsterite by schema (3Fe2+)oct → (2Fe3+ + □)oct that reflects redox conditions of the rock formation resulting in good agreement between compositions of apatite, magnetite, calcite and forsterite. View Full-Text
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Mikhailova, J.A.; Ivanyuk, G.Y.; Kalashnikov, A.O.; Pakhomovsky, Y.A.; Bazai, A.V.; Panikorovskii, T.L.; Yakovenchuk, V.N.; Konopleva, N.G.; Goryainov, P.M. Three-D Mineralogical Mapping of the Kovdor Phoscorite–Carbonatite Complex, NW Russia: I. Forsterite. Minerals 2018, 8, 260.
Mikhailova JA, Ivanyuk GY, Kalashnikov AO, Pakhomovsky YA, Bazai AV, Panikorovskii TL, Yakovenchuk VN, Konopleva NG, Goryainov PM. Three-D Mineralogical Mapping of the Kovdor Phoscorite–Carbonatite Complex, NW Russia: I. Forsterite. Minerals. 2018; 8(6):260.Chicago/Turabian Style
Mikhailova, Julia A.; Ivanyuk, Gregory Y.; Kalashnikov, Andrey O.; Pakhomovsky, Yakov A.; Bazai, Ayya V.; Panikorovskii, Taras L.; Yakovenchuk, Victor N.; Konopleva, Nataly G.; Goryainov, Pavel M. 2018. "Three-D Mineralogical Mapping of the Kovdor Phoscorite–Carbonatite Complex, NW Russia: I. Forsterite." Minerals 8, no. 6: 260.
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