Journal ArticleDOI
Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb geochronology
Frank Melcher,Torsten Graupner,Hans-Eike Gäbler,Maria Sitnikova,Friedhelm Henjes-Kunst,Thomas Oberthür,Axel Gerdes,Stijn Dewaele +7 more
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TLDR
In this paper, the U-Pb method was used to determine the age of Columbite-group minerals (CGM) from 13 rare-element granite and pegmatite districts in Africa.About:
This article is published in Ore Geology Reviews.The article was published on 2015-01-01. It has received 181 citations till now. The article focuses on the topics: Ixiolite & Tapiolite.read more
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Phanerozoic tin and tungsten mineralization—Tectonic controls on the distribution of enriched protoliths and heat sources for crustal melting
Rolf L. Romer,Uwe Kroner +1 more
TL;DR: In this paper, the formation of these belts is explained by a generic process, involving three independent steps as prerequisite for the development of deposits: (i) intense chemical weathering of sedimentary rocks on a stable continent resulting in the enrichment of Sn and W in the protoliths, (ii) sedimentary-followed by tectonic-accumulation of the enriched debris at continent margins, and (iii) heating of the voluminous sedimentary protoliss generating Sn and/or W enriched melts.
Journal ArticleDOI
Pegmatites and aplites: Their genetic and applied ore geology
TL;DR: Pegmatites are very coarse-grained basement rocks abundant in quartz, feldspar or/and mica, in places endowed either with mega crystals of the aforementioned rock-forming minerals or rare-element minerals as discussed by the authors.
Journal ArticleDOI
Fluid fractionation of tungsten during granite–pegmatite differentiation and the metal source of peribatholitic W quartz veins: Evidence from the Karagwe-Ankole Belt (Rwanda)
TL;DR: In this paper, the Nyakabingo vein system was studied and it was shown that the fluid saturation started prior to or at the granite-pegmatite transition stage resulting in apical to peribatholitic tungsten veins systems that are paragenetically older than the final pegmatite stage.
Journal ArticleDOI
Carbonatite-hosted niobium deposit at Aley, northern British Columbia (Canada): Mineralogy, geochemistry and petrogenesis
Anton R. Chakhmouradian,Ekaterina P. Reguir,Ryan D. Kressall,Jeremy Crozier,Laura K. Pisiak,Ravinder Sidhu,Panseok Yang +6 more
TL;DR: The Aley Nb deposit in northern British Columbia, Canada, is hosted by metamorphosed calcite and dolomite carbonatites of anorogenic affinity emplaced in Lower Paleozoic sedimentary carbonate rocks in the Devonian as discussed by the authors.
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The Sveconorwegian Pegmatite Province – Thousands of Pegmatites Without Parental Granites
TL;DR: In this paper, the Niobium-Yttrium-fluorine (NYF) signature of Sveconorwegian pegmatites is used to classify them.
References
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Journal ArticleDOI
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
Journal ArticleDOI
Abundances of the elements: Meteoritic and solar
Edward Anders,Nicolas Grevesse +1 more
TL;DR: In this article, new abundance tables have been compiled for C1 chondrites and the solar photosphere and corona, based on a critical review of the literature to mid-1988.
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ARC Assembly and Continental Collision in the Neoproterozoic East African Orogen: Implications for the Consolidation of Gondwanaland
TL;DR: The most important, rapid, and enigmatic changes in our Earth's environment and biota occurred during the Neoproterozoic Era (1000-540 million years ago; Ma).
Book
The Geochronology and Evolution of Africa
L. Cahen,N. J. Snelling +1 more
TL;DR: An integrated continent-wide survey of the geology and geochronology of Africa, giving a balanced view of the history of the continent and the tectono-thermal events that have affected it throughout Precambrian time and into the Phanerozoic is presented in this paper.
Related Papers (5)
Columbite solubility in granitic melts: consequences for the enrichment and fractionation of Nb and Ta in the Earth's crust
Robert L. Linnen,Hans Keppler +1 more