Results 211 to 220 of about 14,584 (265)

Kimberlite and carbonatite dykes within the Premier diatreme root (Cullinan Diamond Mine, South Africa): New insights to mineralogical-genetic classifications and magma CO2 degassing

Lithos, 2019
The ca. 1153 Ma Premier kimberlite pipe on the Kaapvaal craton has been intruded by late-stage kimberlite and carbonatite magmas forming discrete 0.5 to 5 m wide dykes within the lower diatreme.
A. Dongre, S. Tappe
semanticscholar   +1 more source

Solubility of Water in Carbonatites

ACS Earth and Space Chemistry, 2020
Water solubility in carbonatite magmas at 1 bar total pressure has been explored. Three compositions of carbonatite magma have been studied: natrocarbonatite from Oldoinyo Lengai, Tanzania, and two...
Nathan S. Jacobson, Bruce Fegley, John A. Setlock, Gustavo Costa   +3 more
openaire   +1 more source

Mineralogy and geochemistry of the Morro dos Seis Lagos siderite carbonatite, Amazonas, Brazil

, 2020
The Morro dos Seis Lagos niobium rare earth element, Ti-bearing lateritic deposit (Amazonas, Brazil) is derived from a primary siderite carbonatite. The complex is the only example of a Nb deposit in which Nb-rich rutile is the main Nb ore mineral. Apart
Arthur L. Giovannini, R. Mitchell, A. C. B. Neto, C. Moura, V. P. Pereira, C. Porto   +5 more
semanticscholar   +1 more source

On the origin of carbonatites

International Geology Review, 1977
(1977). On the origin of carbonatites. International Geology Review: Vol. 19, No. 9, pp. 997-1008.
openaire   +1 more source

Nephelinites and carbonatites

Geological Society, London, Special Publications, 1987
Summary Carbonatites found in strongly alkaline intra-plate petrographic volcanic provinces are associated with olivine-poor nephelinites and with phonolites. Olivine-rich nephelinites occur in basanitic and alkali basalt provinces, normally without carbonatites.
openaire   +1 more source

Nb–V-enriched sövites of the northeastern and eastern part of the Amba Dongar carbonatite ring dike, India – A reflection of post-emplacement hydrothermal overprint?

, 2020
Wakefieldite-(Ce,La) and vanadinite in coarse-grained calciocarbonatites (sovites) are for the first time reported from the northeastern part of the worldwide largest fluorite deposit at the Amba Dongar carbonatite ring dike, India.
T. Magna, S. Viladkar, V. Rapprich, O. Pour, J. Hopp, B. Čejková   +5 more
semanticscholar   +1 more source

The Catanda extrusive carbonatites (Kwanza Sul, Angola): an example of explosive carbonatitic volcanism

Bulletin of Volcanology, 2014
2 ...
Campeny, Mark, Mangas, J, Melgarejo, JC, Bambi, A, Alfonso, P, Gernon, Thomas, Manuel, J   +6 more
openaire   +3 more sources

Carbonatites in China: A review

Journal of Asian Earth Sciences, 2006
Abstract There are 27 known occurrences of carbonatites in China. Brief descriptions are given of all occurrences including geographical coordinates, geological setting, associated rocks, carbonatite forms, ages, mineralogy, mineralisation, and carbon and oxygen isotopic data.
Zhuming Yang, Alan Woolley
openaire   +1 more source

Occurrence and geochemistry of bastnäsite in carbonatite-related REE deposits, Mianning–Dechang REE belt, Sichuan Province, SW China

Ore Geology Reviews, 2019
Bastnasite is the main ore mineral in many carbonatite-related rare earth element (REE) deposits, which account for ∼51% of rare-earth oxide reserves worldwide.
Dong-sheng Guo, Yan Liu
semanticscholar   +1 more source

Geological and geochemical characteristics of the Miaoya syenite-carbonatite complex, Central China: Implications for the origin of REE-Nb-enriched carbonatite

Ore Geology Reviews, 2019
Carbonatites are well known as economic resources for rare metals, such as rare earth elements (REE) and Nb. However, the origin and evolutionary processes of carbonatites and related silicate rocks as well as the relevant rare metals enrichment ...
Jian-Hui Su, Xin-Fu Zhao, Xiaochun Li, Wei Hu, Mi Chen, Ying Xiong   +5 more
semanticscholar   +1 more source