Phoscorites
WebJan 30, 2024 · P1 phoscorites contain essential olivine, phlogopite and apatite, with accessory magnetite and traces of perovskite whereas P2 phoscorites are composed of the same essential phases but also... WebJul 6, 2010 · Phoscorites are rocks spatially related to carbonatites, defined by modal variations in apatite, magnetite, and olivine ( Yegorov 1993 ). Krasnova et al. (2004) recommended that the name...
Phoscorites
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WebSep 1, 2014 · Phoscorites are a rare rock type: compared with carbonatites, which are known from 527 localities worldwide (Woolley and Kjarsgaard, 2008a, Woolley and … Phoscorites are plutonic ultramafic rocks, comprising magnetite, apatite and one of the silicates, forsterite, diopside or phlogopite. They almost always occur in close association with carbonatites. Common minor minerals are calcite, dolomite, phlogopite, tetraferriphlogopite and richterite.
WebNov 30, 2006 · The principal HFSE carriers in carbonatites and phoscorites (i.e. oxide-phosphate-silicate-rich rocks of carbonatitic affinity) are complex oxide minerals belonging to the perovskite and ilmenite groups and anion-deficient derivatives from the fluorite structure type (see Table 1 for formulae). WebThe Morro do Padre hypogene zone is characterized by E-W–trending dike swarms of tetraferriphlogopite phoscorites (magnetite-apatite-carbonate-tetraferriphlogopite-pyrochlore rocks) and carbonatites intrusive within Precambrian rocks. The magmatic origin of these Nb-rich rocks is supported by country rock xenoliths within dikes and ponding ...
WebMay 22, 2015 · All veins cut through host rocks, phoscorites, and phoscorite-related carbonatites, and the veins of dolomite carbonatite cut also through calcite carbonatite veins. Dolomite carbonatite is similar to magnetite–dolomite–phlogopite–serpentine rock, which forms sub-vertical bodies (up to 200 m in diameter) within the phoscorite ... Webof phoscorites is due to significant variations in contents of forsterite, magnetite, apatite, phlogopite, tetraferriphlogopite, calcite and dolomite. Phoscorites from other Kola localities can be forsterite-free, and they contain diopside or aegirine (Turiy Mys, Seblyavr and Khibina), and some of them are enriched in phlogopite (Sokli
WebMay 24, 2024 · FOS 1 contains the primary minerals olivine, magnetite with isomorphic Ti impurities, phlogopite replaced by tetraferriphlogopite along the rims, and apatite poorly enriched in REE. Baddeleyite predominates among the accessory minerals in FOS 1. Zirconolite enriched with REE and Nb and pyrochlore are found in smaller quantities.
WebJan 1, 2004 · They show variable modal composition in terms of both principal (diopside, magnesiohastingsite and calcite) and minor (perovskite, magnetite, titanite, chlorite and ilmenite) rock-forming phases, delineating a series from calcite-amphibole clinopyroxenite to calcite carbonatite. highline performanceWebThe Kovdor phoscorite-carbonatite ore-pipe rocks form a natural series, where apatite and magnetite first gradually increase due to the presence of earlier crystallizing forsterite in the pipe marginal zone and then decrease as a result of carbonate development in the axial zone. In all lithologies, magnetite grains contain (oxy)exsolution inclusions of … small rectangle cloakroom sinkWebFeb 8, 2024 · We were founded by Constantine “Deno” Macricostas in Danbury, Connecticut in 1969. This one man, in a garage, began what would become the world’s leading … highline pentagon cityWebof phoscorites is due to significant variations in contents of forsterite, magnetite, apatite, phlogopite, tetraferriphlogopite, calcite and dolomite. Phoscorites from other Kola … small rectangle glasses framesWebMay 24, 2024 · Of the accessory minerals, pyrochlore predominates and is enriched in Ta, Th, and U; baddeleyite is subordinate and enriched in Nb. Chemical and textural … small rectangle cushion padsWebAnatoly Zaitsev; Keith Bell 1995: Sr and Nd isotope data of apatite, calcite and dolomite as indicators of source, and the relationships of phoscorites and carbonatites from the Kovdor Massif, Kola Peninsula, Russia Contributions to Mineralogy and Petrology 121(3): 324-335 highline performing artsWebThe Kovdor phoscorite-carbonatite ore-pipe rocks form a natural series, where apatite and magnetite first gradually increase due to the presence of earlier crystallizing forsterite in … highline performance sedro woolley