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Название: Italian carbonatite system: From mantle to ore-deposit
Авторы: Stoppa, F.
Schiazza, M.
Rosatelli, G.
Castorina, F.
Sharygin, V. V.
Ambrosio, F. A.
Vicentini, N.
Дата публикации: 2019
Издатель: Elsevier B.V.
Библиографическое описание: Italian carbonatite system: From mantle to ore-deposit / F. Stoppa, M. Schiazza, G. Rosatelli, F. Castorina, et al.. — DOI 10.1016/j.oregeorev.2019.103041 // Ore Geology Reviews. — 2019. — Iss. 114. — 103041.
Аннотация: A new discovery of carbonatites at Pianciano, Ficoreto and Forcinelle in the Roman Region demonstrates that Italian carbonatites are not just isolated, mantle xenoliths-bearing, primitive diatremic rocks but also evolved subtype fluor-calciocarbonatite (F ~ 10 wt%) associated with fluor ore (F ~ 30 wt%). New data constrain a multi-stage petrogenetic process, 1-orthomagmatic, 2-carbothermal, 3-hydrothermal. Petrography and geochemistry are conducive to processes of immiscibility and decarbonation, rather than assimilation and crystal fractionation. A CO2-rich, ultra-alkaline magma is inferred to produce immiscible melilite leucitite and carbonatite melts, at lithospheric mantle depths. At the crustal level and in the presence of massive CO2 exsolution, decarbonation reactions may be the dominant processes. Decarbonation consumes dolomite and produces calcite and periclase, which, in turn, react with silica to produce forsterite and Ca silicates (monticellite, melilite, andradite). Under carbothermal conditions, carbonate breakdown releases Sr, Ba and LREE; F and S become concentrated in residual fluids, allowing precipitation of fluorite and barite, as well as celestine and anhydrite. Fluor-calciocarbonatite is the best candidate to exsolve fluids able to deposit fluor ore, which has a smaller volume. At the hydrothermal stage, REE concentration and temperature dropping allow the formation of LREEF2+ and LREECO3+ ligands, which control the precipitation of interstitial LREE fluorcarbonate and silicates: (bastnäsite-(Ce), Ce(CO3)F and britholite-(Ce), (Ce,Ca)5(SiO4,PO4)3(OH,F). Vanadates such as wakefieldite-(Ce), CeVO4, vanadinite, Pb5(VO4)3Cl and coronadite Pb(Mn4+ 6 Mn3+ 2)O16 characterise the matrix. At temperatures of ≤100 °C analcime, halloysite, quartz, barren calcite, and zeolites (K-Ca) precipitate in expansion fractures, veins and dyke aureoles. © 2019 The Authors
Ключевые слова: CARBONATITE PETROGENETIC MODEL
FLUOR-CALCIOCARBONATITE
IMMISCIBILITY
ITALIAN CARBONATITES
MELT DECARBONATION
REE
BINARY ALLOYS
CALCITE
CALCIUM ALLOYS
CARBON DIOXIDE
DEPOSITS
FLUORSPAR
KAOLINITE
MAGNESIA
ORE DEPOSITS
POTASSIUM ALLOYS
SILICA
SILICATES
SOLUBILITY
TRANSITION METAL COMPOUNDS
VANADATE MINERALS
ZEOLITES
CARBONATITES
CRYSTAL FRACTIONATION
DECARBONATION
DOMINANT PROCESS
FLUOR-CALCIOCARBONATITE
LITHOSPHERIC MANTLE
MANTLE XENOLITHS
PETROGENETIC PROCESS
CERIUM COMPOUNDS
CARBON DIOXIDE
CARBONATITE
CRYSTAL STRUCTURE
FRACTIONATION
IGNEOUS GEOCHEMISTRY
IMMISCIBILITY
ORE DEPOSIT
RARE EARTH ELEMENT
XENOLITH
URI: http://elar.urfu.ru/handle/10995/92657
Условия доступа: info:eu-repo/semantics/openAccess
Идентификатор SCOPUS: 85072772667
Идентификатор WOS: 000498306900021
Идентификатор PURE: 11101411
ISSN: 0169-1368
DOI: 10.1016/j.oregeorev.2019.103041
Сведения о поддержке: 689909
IGM SD RAS 0330-2016-0005
The HiTech AlkCarb European Union Horizon 2020 project grant-agreement number 689909 supported this research. Mineralogical studies was also partly supported by the Russian State assignment project IGM SD RAS 0330-2016-0005.
Располагается в коллекциях:Научные публикации, проиндексированные в SCOPUS и WoS CC

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