Results 1 to 10 of about 388 (174)
Origin of alkali-rich volcanic and alkali-poor intrusive carbonatites from a common parental magma [PDF]
Scientific Reports, 2021 The discrepancy between Na-rich compositions of modern carbonatitic lavas (Oldoinyo Lengai volcano) and alkali-poor ancient carbonatites remains a topical problem in petrology.
Ivan F. Chayka +6 more
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Geosciences (Switzerland), 2018 This article is devoted to the geology of titanium-rich varieties of the Petyayan-Vara rare-earth dolomitic carbonatites in Vuoriyarvi, Northwest Russia. Analogues of these varieties are present in many carbonatite complexes. The aim of this study was to
Evgeniy Kozlov +2 more
exaly +3 more sources
Mantle Metasomatism and REE Enrichment in the Genetic Source of the Dalucao Carbonatite Complex (Sichuan, China): Insights from Elemental Geochemistry and In-Situ Sr Isotopes of Two Calcite Types [PDF]
Lithosphere, 2023 Carbonatites possess the highest rare earth element (REE) concentrations among all magmatic rocks, yet the mechanisms governing the enrichment of REEs in carbonatites remain enigmatic.
Xiaochao Shu +3 more
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NEW DATA ON MINERALOGY OF THE SUGUR COPPER DEPOSIT, SOUTH URALS [PDF]
Минералогия, 2022 The previous and new data on minerals and mineral assemblages of the Sugur copper deposit in the Sugur Mountains of South Urals are summarized. The ores of the deposit host abundant calcite, andradite, diopside, magnetite, chromite and serpentine ...
V.A. Popov +2 more
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Comptes Rendus. Géoscience, 2021 Carbonatites are unusual C-rich alkaline magmas that have been reported throughout the geological record. Nevertheless, there is only one currently active carbonatite system on Earth: Oldoinyo Lengai stratovolcano in northern Tanzania (God’s mountain in ...
France, Lydéric +2 more
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Frontiers in Earth Science, 2021 The 2 Ga-old Ihouhaouene alkaline complex (Western Hoggar, Algeria) is among the oldest known carbonatite occurrences on Earth. The carbonatites are calciocarbonatites hosted by syenites, the predominant rock type in the complex.
A. Djeddi +6 more
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UNIQUE ULTRA-RICH RARE METAL ORES OF THE TOMTOR COMPLEX AND PROBLEM OF THEIR GENESIS [PDF]
Минералогия, 2019 Main genetic models of the formation of ultra-rich rare metal ores of the Tomtor deposit (Yakutia) are compared on the basis of their structural-textural features, mineral composition, and geologic setting: 1) reducing epigenesis of laterite weathering ...
A.V. Lapin, A.V. Tolstov, I.M. Kulikova
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Geology, petrography and mineralogy of explosive breccias of Sallanlatva, Kola Region
Vestnik MGTU, 2021 The Sallanlatva massif belongs to the group of Paleozoic alkaline-ultrabasic complexes wide spread in the Kola Region (the northwestern part of the Fennoscandian Shield).
Sidorov M. Yu. +2 more
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A UNIQUE ORE LOCALITY OF POLYAKOVITE-(Ce) IN THE ILMENY MOUNTAINS, SOUTH URALS – NEW FINDS [PDF]
Минералогия, 2020 A large crystal of the rarest mineral polyakovite was discovered in 2019 in the carbonatitespegmatites of pit № 97 of the Ilmeny Mountains. Bodies of carbonatites, glimmerites, glimmeritespegmatites and carbonatite-pegmatites are located within a small ...
V.A. Popov +2 more
doaj +1 more source
Carbonatites from the Southern Brazilian platform: I
Open Geosciences, 2020 We present a comprehensive overview of the geochemical characteristics and evolution of the carbonatites from the southern Brazilian Platform (Paraná Basin).
Speziale Sergio +5 more
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