https://repository.kopri.re.kr/handle/201206/5421 2026-04-16T06:22:08Z 2026-04-16T06:22:08Z Lee, Mi Jung Jaques Moutte Lee, Jong Ik https://repository.kopri.re.kr/handle/201206/6591 2022-03-24T07:12:26Z 2005-01-01T00:00:00Z

Title: Compositional variation of Fe-Ti oxides from the Sokli complex, northeastern Finland Authors: Lee, Mi Jung; Jaques Moutte; Lee, Jong Ik Abstract: The phoscorite-carbonatite complex at Sokli, northeastern Finland, is composed of five stages of intrusions of phoscorites and carbonatites (P1-C1, P2-C2, P3-C3 phoscorites and calcite carbonatites, D4 and D5 dolomite carbonatites) which are cut by numerous lamprophyric dikes. Magnetite is ubiquitous in all constituent rock units of the complex and frequently associates with ilmenite. Most ilmenite intergrowths from the Sokli phoscorite-carbonatite complex occur as internal and/or external granules (composite type exsolutions) or sandwich type exsolution lamellae in the host magnetites. Discrete ilmenite crystals are found only in P3 and C3. Whereas, in the ultramafic lamprophyres ilmenites occur as discrete crystals as well as trellis and sandwich type exsolution lamellae or composite type exsolutions in magnetite. Electron microprobe analyses reveal that magnetite of the Sokli complex belongs essentially to the magnetite-ulv？;spinel solid solution series with a small proportion of magnesioferrite. The compositions of magnetite from the Sokli phoscorite-carbonatite complex vary systematically from stage to stage with increasing Fe2+/(Fe2++Mg) ratio, and decreasing Al, Mn and Ti contents. Magnetite from the ultramafic lamprophyres is characterized by large compositional ranges due to the large amount of mantle-derived xenocrysts. Some grains are particularly high in Cr (up to 21.0 wt.% Cr2O3). Ti-, Mg- and Al-rich aluminous magnesian titanomagnetites are also found, however, most magnetites in the ultramafic lamprophyres are pure magnetite. The compositional variation of ilmenite from the Sokli complex is mainly caused by the substitution of Fe2+ into Mg and Mn, and partly Ti into Nb. Mg- and Mn-rich ilmenites in the early stage P1-C1 rocks evolve towards pure FeTiO3 composition in the latest D5 dolomite carbonatite. Ilmenites from the ultramafic lamprophyres are relatively poor in Mn compared to those from the phoscorite-carbonatite complex. In the coexisting m

2005-01-01T00:00:00Z J.Moutte Lee, Jong Ik Hur, Soon Do Kim, Yeadong Lee, Mi Jung E.Balaganskaya https://repository.kopri.re.kr/handle/201206/7534 2022-03-24T07:10:36Z 2004-01-01T00:00:00Z

Title: Sr-Nd-Pb isotopic systematics of the Kovdor phoscorite-carbonatite complex, Kola Alkaline Province, NW Russia: Implication for plume-related source characteristics Authors: J.Moutte; Lee, Jong Ik; Hur, Soon Do; Kim, Yeadong; Lee, Mi Jung; E.Balaganskaya Abstract: Sr-Nd-Pb isotopic compositions from the Kovdor complex (380 Ma) in the Kola Alkaline Province, NW Russia, have been determined to define the possible mantle components responsible for the formation of ultramafic-alkaline-carbonatite magmas. Measured rocks plot in the depleted mantle quadrant of the Nd-Sr correlation diagram with negative eSt(t) (-5.4 to -12.2) and positive eNd(t) (1.0 to 4.7). Combined with the previous results, the fairly large range of isotopic compositions of Kovdor rocks is not in favor of a simple, closed system magmatic evolution; it suggests a complex evolution implying several magma batches derived either from an isotopically heterogeneous mantle source or from various mixing proportions of two mantle reservoirs. Two end members (KCL, by Kramme, 1993) have been suggested to explain the isotopic compositions of the Kola ultramafic-alkaline rocks and carbonatites; One is the EM I component and the other is the DM component. However, our new Pb isotopic data suggest an involvement of fairly different component from the DM, which is relatively primitive isotopic component, probably derived from a lower-mantle plume. Though the Pb isotope data are still very insufficient in the Kola Alkaline Province, the present data from the Kovdor complex suggest that one end-member of isotopically primitive component should be similar to that of 'FOZO' component, derived from the lower mantle reservoir, the so-called '5th component' in mantle plumes. Thus we propose that a Devonian equivalent of 'FOZO' component represents one of the mantle sources responsible for the formation of the ultramafic-alkaline-carbonatite complexes in the Kola Alkaline Province.

2004-01-01T00:00:00Z Lee, Mi Jung J.Moutte Lee, Jong Ik Kim, Yeadong D.garcia https://repository.kopri.re.kr/handle/201206/7531 2022-03-24T07:10:35Z 2004-01-01T00:00:00Z

Title: Mineralogical evolution of the Sokli phoscorite-carbonatite complex, Kola Peninsula, Finland Authors: Lee, Mi Jung; J.Moutte; Lee, Jong Ik; Kim, Yeadong; D.garcia Abstract: There is a close mineralogical correspondance between phoscorites and paired calcite carbonatites, and the same evolution trend on major minerals is identified in both rock types. This trend involves a sustained increase in alkalinity and it is tentatively attributed to deep differentiation of a mixed carbonate-silicate-phosphate (Fe-rich) parental melt. However, detailed examination of mineral chemistry, especially, on late stage minerals, i.e., phlogopite and pyrochlore indicates that the chemical condition in which these minerals crystallized was clearly different in the two systems. The two associated rocks are considered to have been derived from a common parental magma enriched in Fe, Si, P and carbonates, and their geochemical contrasts to have been produced during the separation of two rocks from the parental magma.The mineralogical records suggest that each magmatic pulse segregates at upper levels to produce a phoscorite/calcite carbonatite pair with a distinct mineralogy. The liquid immiscibility process most simply explains a large chemical gap and different mineralogical records in late stage of phoscorites and conjugated carbonatites. Therefore, liquid immiscibility is favored for explaining the chemical fractionation observed in the Sokli PCC. Fe-Mn dolomite carbonatites, locally enriched in Sr, Ba and LREE, are the latest products from the residual (still Mg-rich) melt left after the crystallization of the Ca-carbonatites and phoscorites.

2004-01-01T00:00:00Z 김창수 Hur, Soon Do Choi, Byeon-Gak Lee, Mi Jung Lee, Jong Ik https://repository.kopri.re.kr/handle/201206/7535 2022-03-24T07:13:50Z 2004-01-01T00:00:00Z

Title: Magmatic Evolution of the Salmagora Ultramafic-Alkaline-Carbonatite-Complex (UACC), Kola Alkaline Province, NW Russia Authors: 김창수; Hur, Soon Do; Choi, Byeon-Gak; Lee, Mi Jung; Lee, Jong Ik Abstract: The Salmagora complex, located in the southern part of the Kola Peninsula, NW Russia, shows a typical concentric zonation. This pluton consists of the sequence of rocks (dunite - wehrlite - ultramelilitolite - turjaite - pyroxenite - melteigite - ijolite - urtite - carbonatite) from the margin to the center of the complex. The Salmagora pluton comprises predominantly olivine-, clinopyroxene- and melilite-dominant ultramafic cumulates in the margin, clinopyroxene- and nepheline-dominant alkaline rocks in the center of the complex, calcite-dominant carbonatites intruded the complex at last. From the microscopic studies, dunite, wehrlite, ultramelilitolite, pyroxenite are consideres as cumulate facies, whereas the foidolites seem to have been formed from the residual magma of pyroxenite cumulates by crystal fractionation. Different from the simple chemical composition and mineral assemblage of the cumulate facies, pyroxenite-foidolite evolving series branched two types. They show different mineral assemblage, REE pattern, and chemical composition of minerals. One type is phlogopite, perovskite rich, the other is garnet, sphene rich in their minor mineral and whole-rock compositions with some HREE enrichment, which means they evolved from different sources. The spinel group minerals appear in all facies of the complex, and their chemical compositions varies from the spinel (sensu stricto) component to the pure magnetite component. The highest spinel component founded in the dunite cumulates evolves pure manetite component of the foidolite facies, which distinctly indicate inward crystallization sequence. The Al-Mg contents of spinel group minerals continuously decrease toward the later sequence, suggesting that all Salmagora rock units except the latter pyroxenite-foidolite series represent a continuum of a common magma. The latter pyroxenite-foidolite series seems to have been a different magma pulse which was derived from a lower-temperature regime of the source.

2004-01-01T00:00:00Z