Results 151 to 160 of about 7,282 (216)
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Mineralogical magazine, 2021
The Neoproterozoic Lofdal alkaline carbonatite complex consists of a swarm of carbonatite dykes and two plugs of calcite carbonatite known as the ‘Main’ and ‘Emanya’ carbonatite intrusions, with associated dykes and plugs of phonolite, syenite, rare ...
M. Sitnikova +3 more
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The Neoproterozoic Lofdal alkaline carbonatite complex consists of a swarm of carbonatite dykes and two plugs of calcite carbonatite known as the ‘Main’ and ‘Emanya’ carbonatite intrusions, with associated dykes and plugs of phonolite, syenite, rare ...
M. Sitnikova +3 more
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An Introduction to Carbonatites and Carbonatite Complexes
2018The Alno igneous complex intruded local migmatites and granite country-rocks of Svecofennian age at ~580 Ma and produced a suite of early alkaline silicate intrusives (e.g., ijolites, nepheline syenites) and dykes (e.g., trachytes, phonolites) and later a suite of carbonatite sheet intrusions for which Alno is widely known.
Peter Kresten, Valentin R. Troll
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The Fluorapatite P–REE–Th Vein Deposit at Nolans Bore: Genesis by Carbonatite Metasomatism
, 2020Nolans Bore is a rare earth element (REE) ore deposit in the Reynolds Range, Aileron Province, Northern Territory, Australia. It consists primarily of fluorapatite and alteration products thereof, surrounded by a diopside-dominated selvage.
M. Anenburg, J. Mavrogenes, V. Bennett
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Earth and Planetary Science Letters, 2019
Carbonatite metasomatism plays an important role in modifying the composition of Earth's mantle, however, its effect on mantle Mg isotopic composition is poorly constrained.
Ji-Feng Ying, Yang Sun, Ben-Xun Su
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Carbonatite metasomatism plays an important role in modifying the composition of Earth's mantle, however, its effect on mantle Mg isotopic composition is poorly constrained.
Ji-Feng Ying, Yang Sun, Ben-Xun Su
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CARBONATITES AND CARBONATITES AND CARBONATITES
The Canadian Mineralogist, 2005Le clan des carbonatites est ici redefini dans le contexte d'une classification mineralogique et genetique, et subdivise en deux groupes: carbonatites primaires et residus carbothermaux. On souligne le fait que "carbonatite" est a la fois un terme petrographique applicable a un type de roche particulier, et un terme faisant reference a un groupe de ...
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Economic Geology
The giant Bayan Obo deposit in China represents the largest rare earth element (REE) resource in the world, but the mechanisms for its highly anomalous REE enrichment have long been controversial.
Xiao-Chun Li +5 more
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The giant Bayan Obo deposit in China represents the largest rare earth element (REE) resource in the world, but the mechanisms for its highly anomalous REE enrichment have long been controversial.
Xiao-Chun Li +5 more
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Nature, 1957
IN 1952 1 one of us described specimens of syenitic and carbonate rocks collected in northern Kivu, near the south-western termination of the Lake Edward Rift, by Borgniez, in 1938 2. The junior author has recently had the opportunity of revisiting the locality and has established the carbonatitic nature of the carbonate rocks.
P. DE BÉTHUNE, A. MEYER
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IN 1952 1 one of us described specimens of syenitic and carbonate rocks collected in northern Kivu, near the south-western termination of the Lake Edward Rift, by Borgniez, in 1938 2. The junior author has recently had the opportunity of revisiting the locality and has established the carbonatitic nature of the carbonate rocks.
P. DE BÉTHUNE, A. MEYER
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The Primary Geology of the Paleoproterozoic MT Weld Carbonatite Complex, Western Australia
Journal of PetrologyThe paleoregolith overlying the c. 2.06 Ga Mt Weld carbonatite (eastern Yilgarn Craton, Western Australia) hosts one of the largest Rare Earth Element (REE) deposits globally.
R. Chandler +5 more
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Properties of Carbonatite Magma and Processes in Carbonatite Magma Chambers
The Journal of Geology, 1983The physical and thermal properties of carbonatite magmas are estimated by analogy with alkali carbonate melts, which are ionic liquids, composed of discrete, unpolymerized ions. Carbonatite magmas are estimated to have low viscosity (on the order of 5 × 10-2 poise), low heat of fusion (175 J/gm), and large thermal diffusivity (4 × 10-3 J/cm-sec-K ...
Allan H. Treiman, Andrew Schedl
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, 2020
The newly-discovered supergiant Huayangchuan uranium (U)-polymetallic deposit is situated in the Qinling Orogen, Central China. The deposit contains economic endowments of U, Nb, Pb, Se, Sr, Ba and REEs, some of which (e.g., U, Se, and Sr) reaching super-
Hui Zheng +8 more
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The newly-discovered supergiant Huayangchuan uranium (U)-polymetallic deposit is situated in the Qinling Orogen, Central China. The deposit contains economic endowments of U, Nb, Pb, Se, Sr, Ba and REEs, some of which (e.g., U, Se, and Sr) reaching super-
Hui Zheng +8 more
semanticscholar +1 more source