First data on the geochemistry and U-Pb age of zircons from the kamaphorites of the Tomtor alkaline-ultrabasic massif, Arctic Yakutia

Скублов, С. Г.; Толстов, А. В.; Baranov, Leonid; Мельник, А. Е.; Левашова, Е. В.

doi:10.1016/j.chemer.2019.04.001

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…carbonatite to 42 wt% SiO2 (close to ijolites) ( Figure 9, Table S2). The variations of SiO2 and major elements are similar to aillikites of Labrador [7,13,57] and other regions such as the Tomtor massif [6,47,58,59], Chadobets uplift [31,33], Scotland [23], Greenland [20,27] and Eastern India [28]. The average aillikite composition from 232 samples worldwide [1] practically coincides with the composition of some aillikites from BZM but many of the latter are richer in alkalis and Al2O3 (higher modal proportion of Phl.…”

Section: Major Element Compositionsmentioning

confidence: 65%

“…Such processes of interaction of plumes and metasomatized mantle were the reason of formation of ultramafic carbonatite complexes worldwide [1][2][3][4][5]7,8,[11][12][13][14]18,22,26,29,32,38,39,57,81,86,88,89,109] and in Siberia [4,58,59,[105][106][107]110]. An additional source can be considered the transfer of some components (LREE, LILE) by fluxes of volatiles, or melts that are saturated in volatiles [77,107,108,111].…”

Section: The Source Of the Ore Substancementioning

confidence: 99%

“…Variations of bulk rock compositions of BZM aillikites in comparison with the Labrador aillikites[7,13,29,57] and Tomtor lamprophyres[6,47,58,59].…”

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confidence: 99%

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Aillikites and Alkali Ultramafic Lamprophyres of the Beloziminsky Alkaline Ultrabasic-Carbonatite Massif: Possible Origin and Relations with Ore Deposits

et al. 2020

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The 650–621 Ma plume which impinged beneath the Siberian craton during the breakup of Rodinia caused the formation of several alkaline carbonatite massifs in craton margins of the Angara rift system. The Beloziminsky alkaline ultramafic carbonatite massif (BZM) in the Urik-Iya graben includes alnöites, phlogopite carbonatites and aillikites. The Yuzhnaya pipe (YuP) ~ 645 Ma and the 640–621 Ma aillikites in BZM, dated by 40Ar/39Ar, contain xenoliths of carbonated sulfide-bearing dunites, xenocrysts of olivines, Cr-diopsides, Cr-phlogopites, Cr-spinels (P ~ 4–2 GPa and T ~ 800–1250 °C) and xenocrysts of augites with elevated HFSE, U, Th. Al-augites and kaersutites fractionated from T ~ 1100–700 °C along the 90 mW/m2 geotherm. Higher T trend for Al-Ti augite, pargasites, Ti-biotites series (0.4–1.5 GPa) relate to intermediate magma chambers near the Moho and in the crust. Silicate xenocrysts show Zr-Hf, Ta-Nb peaks and correspond to carbonate-rich magma fractionation that possibly supplied the massif. Aillikites contain olivines, rare Cr-diopsides and oxides. The serpentinites are barren, fragments of ore-bearing Phl carbonatites contain perovskites, Ta-niobates, zircons, thorites, polymetallic sulphides and Ta-Mn-Nb-rich magnetites, ilmenites and Ta-Nb oxides. The aillikites are divided by bulk rock and trace elements into seven groups with varying HFSE and LILE due to different incorporation of carbonatites and related rocks. Apatites and perovskites reveal remarkably high LREE levels. Aillikites were generated by 1%–0.5% melting of the highly metasomatized mantle with ilmenite, perovskite apatite, sulfides and mica, enriched by subduction-related melts and fluids rich in LILE and HFSE. Additional silicate crystal fractionation increased the trace element concentrations. The carbonate-silicate P-bearing magmas may have produced the concentration of the ore components and HFSE in the essentially carbonatitic melts after liquid immiscibility in the final stage. The mechanical enrichment of aillikites in ore and trace element-bearing minerals was due to mixture with captured solid carbonatites after intrusion in the massif.

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Section: Major Element Compositionsmentioning

confidence: 65%

Section: The Source Of the Ore Substancementioning

confidence: 99%

See 1 more Smart Citation

Aillikites and Alkali Ultramafic Lamprophyres of the Beloziminsky Alkaline Ultrabasic-Carbonatite Massif: Possible Origin and Relations with Ore Deposits

et al. 2020

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Comparative mineralogy, geochemistry and petrology of the Beloziminsky Massif and its aillikite intrusions

Ashchepkov,

Zhmodik,

Belyanin

et al. 2024

Geosystems and Geoenvironment

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Ore of the Tomtor rare-earth deposit for its industrial processing

Zadiranov

Zaya

Dkhar

2020

J. Phys.: Conf. Ser.

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One of the most promising rare-earth metal (REE) deposits is the Tomtor deposit. The purpose of the work was to study the technological sample of the Tomtor ore deposit to determine the methods of its industrial processing. To achieve this target, studies were conducted on the particle size distribution, mineral and chemical composition of the ore. It was established that the ore of the Tomtor deposit is a fine-disperse material, the particles of which are represented by polymineral aggregates of microcrystals smaller than micrometer. The ore belongs to pyrochlore-monazite-crandallite variety of phosphate-rare-metal ores and is rich in the content of minerals of rare-earth elements. Due to the fine-disperse and high complexity, the ore under this studying cannot be enriched by the traditional methods. An option for processing ore using combined pyro- and hydrometallurgy methods is proposed.

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First data on the geochemistry and U-Pb age of zircons from the kamaphorites of the Tomtor alkaline-ultrabasic massif, Arctic Yakutia

Cited by 5 publications

References 20 publications

Aillikites and Alkali Ultramafic Lamprophyres of the Beloziminsky Alkaline Ultrabasic-Carbonatite Massif: Possible Origin and Relations with Ore Deposits

Aillikites and Alkali Ultramafic Lamprophyres of the Beloziminsky Alkaline Ultrabasic-Carbonatite Massif: Possible Origin and Relations with Ore Deposits

Comparative mineralogy, geochemistry and petrology of the Beloziminsky Massif and its aillikite intrusions

Ore of the Tomtor rare-earth deposit for its industrial processing

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