TY - JOUR

T1 - Geochronology and origin of the carbonatites of the Central Taimyr Region, Russia (Arctica): Constraints on the F-Ba-REE mineralization and the Siberian Large Igneous Province

AU - Prokopyev, I. R.

AU - Doroshkevich, A. G.

AU - Starikova, A. E.

AU - Yang, Y.

AU - Goryunova, V. O.

AU - Tomoshevich, N. A.

AU - Proskurnin, V. F.

AU - Saltanov, V. A.

AU - Kukharenko, E. A.

N1 - Acknowledgments: The mineralogical, geochemical and melt and fluid inclusions studies of the Taimyr carbonatites were supported by the Russian Science Foundation grant No. 19-77-10004 extension (the project extension card https://rscf.ru/en/project/22-77-41005/). The geological investigations were done on state assignment of IGM SB RAS (FWZN2022-0024) and GIN SB RAS (AAAAA21-121011390002-2). The study comparing inclusions in the carbonatites of Tuva and Taimyr was carried out on state assignment of TuvIKOPR SB RAS No. 121031500140-2.

PY - 2023/3

Y1 - 2023/3

N2 - Carbonatites of the Central Taimyr region, formed during the early Triassic (246.5 ± 1.9 Ma), are coeval with other occurrences of alkaline‑carbonatite magmatism of the Siberian LIP and related to the Siberian superplume activity. Petrological characteristics indicate that Central Taimyr carbonatites were derived from an alkaline-carbonatitic melt source with remarkably high concentrations of chloride-phosphate-fluoride-sulfate brines. Magmatic minerals (bearing F-Ba-Sr-REE ores), represented by calcite, fluorite, barite, bastnaesite-(Ce) and fluorapatite, were formed at a temperature range of 720–550 °C by brine-melts. Whereas, hydrothermal mineral assemblages (bearing F-Ba-Sr-REE ores), including magnetite, hematite, monazite-(Ce), parisite-(Ce), fluorite, roscoelite, rutile (Nb), barite, quartz, calcite, dolomite, as well as sulfides and uraninite, occur within a late-stage ore-forming processes, for which mineralized fluids of sulfate-fluoride-chloride‑carbonate and chloride-hydrocarbonate compositions were responsible. Significant changes in the composition of fluid inclusions occurred as the homogenization temperature varied from 460 to 230 °C, and concentrations from 55 to 25 wt% NaCl-eq, respectively.

AB - Carbonatites of the Central Taimyr region, formed during the early Triassic (246.5 ± 1.9 Ma), are coeval with other occurrences of alkaline‑carbonatite magmatism of the Siberian LIP and related to the Siberian superplume activity. Petrological characteristics indicate that Central Taimyr carbonatites were derived from an alkaline-carbonatitic melt source with remarkably high concentrations of chloride-phosphate-fluoride-sulfate brines. Magmatic minerals (bearing F-Ba-Sr-REE ores), represented by calcite, fluorite, barite, bastnaesite-(Ce) and fluorapatite, were formed at a temperature range of 720–550 °C by brine-melts. Whereas, hydrothermal mineral assemblages (bearing F-Ba-Sr-REE ores), including magnetite, hematite, monazite-(Ce), parisite-(Ce), fluorite, roscoelite, rutile (Nb), barite, quartz, calcite, dolomite, as well as sulfides and uraninite, occur within a late-stage ore-forming processes, for which mineralized fluids of sulfate-fluoride-chloride‑carbonate and chloride-hydrocarbonate compositions were responsible. Significant changes in the composition of fluid inclusions occurred as the homogenization temperature varied from 460 to 230 °C, and concentrations from 55 to 25 wt% NaCl-eq, respectively.

KW - Arctica

KW - Carbonatites

KW - Fluid inclusion

KW - LIP

KW - Siberian plume

KW - Sm-Nd

KW - Taimyr

KW - U-Th-Pb

UR - https://www.scopus.com/inward/record.url?eid=2-s2.0-85147220586&partnerID=40&md5=34ac32ed9fd747a119b53d4218a55bf9

UR - https://www.mendeley.com/catalogue/151fc970-b482-345a-bc1e-253cc00d93b2/

U2 - 10.1016/j.lithos.2023.107045

DO - 10.1016/j.lithos.2023.107045

M3 - Article

VL - 440-441

JO - Lithos

JF - Lithos

SN - 0024-4937

M1 - 107045

ER -