Geochemistry of Sc in the magmatic process: Experimental evidence

Shchekina, T. I.; Gramenitskii, E. N.

doi:10.1134/s0016702908040046

Cited by 18 publications

(4 citation statements)

References 8 publications

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“…Veksler and Keppler (2000) observed hydrolysis in a study of element partitioning between carbonate melt and aqueous fluid. The effects of hydrolysis should be analogous to those of CO 2 undersaturation demonstrated by Brooker (1998) Shchekina 1994, 2005;Shchekina and Gramenitskiy, 2008), and the average D values obtained by that group are listed and compared with our results in Table 7. Experiments in Moscow were done in cold-seal pressure vessels at 700-800°C and 100 MPa on synthetic starting mixtures similar to those in our study.…”

Section: Carbonate-silicate Immiscibilitymentioning

confidence: 83%

“…The distribution of Zr, Hf, Nb and Ta is variable, and probably depends on melt compositions that vary from one starting mixture to another. Among the elements not covered in this study, Sc has been previously shown to strongly concentrate in fluoride melts (D Sc around 25-50), while Ge has greater affinity for silicate liquids, with average D values of 0.1-0.8 Shchekina and Gramenitskiy, 2008).…”

Section: Fluoride-silicate Partitioningmentioning

confidence: 95%

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Partitioning of elements between silicate melt and immiscible fluoride, chloride, carbonate, phosphate and sulfate melts, with implications to the origin of natrocarbonatite

Veksler

Dorfman²,

Dulski

et al. 2012

Geochimica et Cosmochimica Acta

199

102

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Section: Carbonate-silicate Immiscibilitymentioning

confidence: 83%

Section: Fluoride-silicate Partitioningmentioning

confidence: 95%

Partitioning of elements between silicate melt and immiscible fluoride, chloride, carbonate, phosphate and sulfate melts, with implications to the origin of natrocarbonatite

Veksler

Dorfman²,

Dulski

et al. 2012

Geochimica et Cosmochimica Acta

199

102

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“…Zone 3 is composed of a quartz-albite-spodumene aggregate. The main minerals are (in vol.%) quartz (60)(61)(62)(63)(64)(65), spodumene (~20) and albite (10)(11)(12)(13)(14)(15). Minor and accessory minerals include tourmaline, beryl, columbite group minerals and microcline.…”

Section: Geology Of the Kola Rare-metal Pegmatite Beltmentioning

confidence: 99%

“…Scandium is a compatible element, and prefers to enter mafic minerals, such as pyroxene and amphibole. In general, pegmatites show low concentrations of Sc, but in F-enriched melts, Sc can be significantly enriched in the residual melt during magmatic evolution, due to the high chemical affinity of Sc to F [60]. The absence of tin in CGM is apparently controlled by abundant cassiterite in the Okhmylk pegmatite (see Section 4.3, below).…”

Section: Okhmylk Depositmentioning

confidence: 99%

Nb-Ta-Sn Oxides from Lithium-Beryllium-Tantalum Pegmatite Deposits of the Kolmozero–Voronja Belt, NW Russia: Implications for Tracing Ore-Forming Processes and Mineralization Signatures

Zozulya,

Morozova,

Kullerud

et al. 2023

Geosciences

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In this paper we present textural and compositional data for columbite group minerals (CGMs) and associated Nb-Ta-Sn oxides from lithium-beryllium-tantalum pegmatite deposits of the Kolmozero–Voronja belt, NW Russia, with the aim of deciphering these characteristics for minerals from deposits with different mineral signatures and lithium ore grade. Minerals from four deposits, including two of world-class (Kolmozero and Polmostundra), are examined. The main controlling factors for CGM compositional ranges are the diversity and rate of magmatic fractionation, hydrothermal overprint and mineral paragenesis, following the specific geochemical signature of the different pegmatite deposits. CGM from Kolmozero include several mineral species (columbite-(Fe), columbite-(Mn), tantalite-(Fe), and tantalite-(Mn)), showing large compositional variations, mainly controlled by Nb-Ta fractionation (Ta/(Ta + Nb) = 0.16–0.70; Mn/(Mn + Fe) = 0.45–0.63). Textural patterns are various (oscillatory, homogeneous, and patchy); spongy domains and overgrowing Ta-rich rims are also observed somewhere. This indicates the involvement of numerous magmatic and hydrothermal processes. The Polmostundra CGMs are represented by columbite-(Fe) with Ta/(Ta + Nb), ranging from 0.05 to 0.39; some crystals are homogenous, and others present normal, oscillatory, mottled and reverse-zoning patterns. The Okhmylk CGMs are irregular normal, patchy and homogeneous columbite-(Fe) and columbite-(Mn), with Ta/(Ta + Nb) = 0.09–0.24 and Mn/(Mn + Fe) = 0.29–0.92, indicating the suppressed magmatic fractionation and iron drop due to precipitation of Fe minerals. Columbite-(Fe) and columbite-(Mn) from the Be-Ta Shongui deposit are less evolved, with Ta/(Ta + Nb) = 0.07–0.23 and Mn/(Mn + Fe) = 0.31–0.55. The minerals are characterized by progressive normal, oscillatory, homogeneous and irregular reverse patterns. Associated pyrochlore minerals occur both as early magmatic (Kolmozero) and late hydrothermal (Polmostundra, Okhmylk). Cassiterite is found only in the Okhmylk dykes, and is apparently of hydrothermal origin. CGM from Li pegmatites have impurities of Ti (0.01–0.05 apfu) and W (up to 0.02 apfu), whereas CGM from Be pegmatites contains elevated Ti (up to 0.09 apfu). The mineral system analysis presented here is relevant for exploration.

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Petrography, geochemistry, and geochronology of the Sc-enriched Kiviniemi ferrodiorite intrusion, eastern Finland

et al. 2020

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The Kiviniemi mafic intrusion, near the eastern margin of the Paleoproterozoic Central Finland Granitoid Complex, is both spatially and temporally associated with post-kinematic Fe-TiP enriched Svecofennian orogenic mafic magmatism. The main rock types in this small (~15 ha) intrusion are garnet-bearing fayalite ferrodiorite, leucoferrodiorite, ferromonzodiorite, and pyroxene diorite. The garnet-bearing fayalite ferrodiorite and leucoferrodiorite contain 50-281 ppm Sc, 275-5600 ppm Zr, and 58-189 ppm Y (n = 42), delineating a mineralized deposit some 2.5 ha in extent. Overall, these rocks show an evolved (ironenriched) tholeiitic character; low values of Ni (< 20-40 ppm), Cr (< 20 ppm), and Cu (< 20-80 ppm); and high contents of Zn (213-700 ppm). The rock-forming minerals in the ferrodioritic rocks are (ferro)hedenbergite, plagioclase (~An 40), ferropargasite and ferroedenite, almandine garnet, and fayalite (Fo 1-4). Accessory minerals include zircon, ilmenite, fluorapatite, biotite, pyrite, pyrrhotite, potassium feldspar, grunerite, and clinoferrosilite. Some relict cumulate textures have been preserved, but primary magmatic features have largely been overprinted by strong recrystallization and corona formation. The main carriers of Sc are amphibole, clinopyroxene, and apatite. The remarkably strong enrichment of Sc in ferromagnesian silicates and apatite, rather than in specific Sc-minerals, implies magmatic enrichment. Post-kinematic mafic intrusions in central Finland constitute a bimodal association with co-existing granitoid counterparts. The Kiviniemi mafic intrusion is associated with a coarse megacrystic granite and the two rock type display mingled contacts, indicative of contemporaneity of the two magmas. This conclusion is in accord with the coincident U-Pb zircon ages for the ferrodiorite, at 1857 ± 2 Ma (multigrain ID-TIMS) and the megacrystic granite, at 1860 ± 7 Ma (single-crystal LA-MC-ICP-MS). The initial εNd value of the ferrodiorite and the granite are + 0.1 and − 2.5, respectively. These Nd isotope compositions probably reflect a chondritic mantle source for the ferrodiorite and suggest incorporation of some Archaean crustal material into the granite in the course of magmatic evolution. The resource estimation calculated for Kiviniemi intrusion by using 40 g/t Sc cut off value is 13.4 Mt of rock with an average grade of 162.7 g/t scandium, 1726 g/t zirconium, and 81 g/t yttrium.

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Geochemistry of Sc in the magmatic process: Experimental evidence

Cited by 18 publications

References 8 publications

Partitioning of elements between silicate melt and immiscible fluoride, chloride, carbonate, phosphate and sulfate melts, with implications to the origin of natrocarbonatite

Partitioning of elements between silicate melt and immiscible fluoride, chloride, carbonate, phosphate and sulfate melts, with implications to the origin of natrocarbonatite

Nb-Ta-Sn Oxides from Lithium-Beryllium-Tantalum Pegmatite Deposits of the Kolmozero–Voronja Belt, NW Russia: Implications for Tracing Ore-Forming Processes and Mineralization Signatures

Petrography, geochemistry, and geochronology of the Sc-enriched Kiviniemi ferrodiorite intrusion, eastern Finland

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