Results 201 to 210 of about 14,584 (265)
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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.
Xiaochun Li +5 more
semanticscholar +1 more source
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.
Xiaochun Li +5 more
semanticscholar +1 more source
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 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
semanticscholar +1 more source
, 2020
The origin of dolomite that hosts the Bayan Obo REE-Nb-Fe deposit (57.4 Mt.@6% REE2O3, 2.16 Mt.@0.13% Nb2O5, and >1500 Mt.@35% iron oxides) has been controversial for decades, but it is integral to understanding of the genesis of this giant deposit.
Shang Liu +5 more
semanticscholar +1 more source
The origin of dolomite that hosts the Bayan Obo REE-Nb-Fe deposit (57.4 Mt.@6% REE2O3, 2.16 Mt.@0.13% Nb2O5, and >1500 Mt.@35% iron oxides) has been controversial for decades, but it is integral to understanding of the genesis of this giant deposit.
Shang Liu +5 more
semanticscholar +1 more source
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
Mantle-derived carbonatites emplaced in orogenic belts and some extensional settings are hypothesized to contain recycled crustal material. However, these carbonatites are typically composed of calcite showing a typical mantle range of C–O isotopic ...
Chun-wan Wei +5 more
semanticscholar +1 more source
Mantle-derived carbonatites emplaced in orogenic belts and some extensional settings are hypothesized to contain recycled crustal material. However, these carbonatites are typically composed of calcite showing a typical mantle range of C–O isotopic ...
Chun-wan Wei +5 more
semanticscholar +1 more source
Mineralogical Magazine, 1981
AbstractNormal carbonatite magmas are characteristically associated with ijolites and produce extensive fenitization by alkali metasomatism, commonly feldspathization or phlogopitization. The sequence of carbonatites developed from this magma are characterized by igneous isotopic ratios, high contents of incompatible elements, their distinctive pattern
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AbstractNormal carbonatite magmas are characteristically associated with ijolites and produce extensive fenitization by alkali metasomatism, commonly feldspathization or phlogopitization. The sequence of carbonatites developed from this magma are characterized by igneous isotopic ratios, high contents of incompatible elements, their distinctive pattern
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Lithos, 2019
A detailed electron microprobe study has been carried out on the compositional variations of mica and apatite from carbonatites, phoscorites and associated pyroxenites (and fenites) of the Loolekop deposit, Palabora Carbonatite Complex (South Africa ...
R. Giebel, M. Marks, C. Gauert, G. Markl
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A detailed electron microprobe study has been carried out on the compositional variations of mica and apatite from carbonatites, phoscorites and associated pyroxenites (and fenites) of the Loolekop deposit, Palabora Carbonatite Complex (South Africa ...
R. Giebel, M. Marks, C. Gauert, G. Markl
semanticscholar +1 more source
, 2020
The Siilinjarvi phosphate deposit (Finland) is hosted by an Archean carbonatite complex. The main body is composed of glimmerite, carbonatite and combinations thereof. It is surrounded by a well-developed fenitization zone.
S. Decrée +6 more
semanticscholar +1 more source
The Siilinjarvi phosphate deposit (Finland) is hosted by an Archean carbonatite complex. The main body is composed of glimmerite, carbonatite and combinations thereof. It is surrounded by a well-developed fenitization zone.
S. Decrée +6 more
semanticscholar +1 more source
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
openaire +1 more source