biotite
From: The Columbia Encyclopedia, Sixth Edition
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Date: 2008
biotite , iron-rich variety of phlogopite, most abdunant of the mica minerals.
Author not available, BIOTITE.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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Retrograde metamorphism in a regional shear zone and related chemical changes: The Kaplice Unit of muscovite-biotite gneisses in the Moldanubian Zone of southern Bohemia, Czech Republic
Journal of the Czech Geological Society; 1/1/2005; Vrána, Stanislav; Bártek, Jirí; 5732 words;
... Kaplice Unit, a regional zone of muscovite-biotite gneisses 558 km in size, was studied. Geochemistry ... U are distinctly depleted in comparison to biotite gneisses of both the Monotonous and the Variegated ... reactions producing muscovite intergrown with biotite in recrystallized quartz-feldspar ...
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Composition of Biotites from Cierna Hora Granitoids (Western Carpathians) as an Indicator of the Granite Tectonic Setting
Geolines; 1/1/2006; Bónová, Katarína; Broska, Igor; Lipka, Jozef; Tóth, Ignác; 459 words;
Biotite - the dominant ferromagnesian mineral - has been analysed ... ratio. The direct relation between chemical composition of biotite and parental rock along with the presence of numerous minute inclusions of primary accessories trapped during biotite growth suggests the magmatic origin of biotite ... .
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Two-mica and biotite granites in the Weitra-Nové Hrady area, Austria - Czech Republic
Journal of the Czech Geological Society; 1/1/2006; Breiter, Karel; Scharbert, Susanna; 6233 words;
... 0.706; (3) chemically primitive Karlstift biotite granite with high magnetic susceptibility ... 87^Sr/^sup 86^Sr^sub i^ = 0.706; (4) Weitra biotite granite with a magnetic and a non-magnetic ... Weinsberg and Freistadt units. Geological maps published by the Czech and Austrian geological ... been formerly used ...
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The Kaplice dyke swarm of biotite granodiorite porphyry and its relationship to the Freistadt granodiorite, Moldanubian Batholith
Journal of the Czech Geological Society; 1/1/2005; Vrána, Stanislav; Slabý, Jaromír; Bendl, Jirí; 4004 words;
... Freistadt granodiorite and the Kaplice swarm of biotite granodiorite porphyry dykes. It is suggested ... parts of the Freistadt pluton. Key words: biotite granodiorite porphyry; strontium isotopes; Freistadt biotite granodiorite; Moldanubian batholith; Kaplice-R ... pegmatites, considered usually as residual ...
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Late-orogenic Variscan magmatism: the case of quartz monzodiorite dykes from the Blanice Graben, southern Bohemia
Journal of the Czech Geological Society; 1/1/2006; Vrána, Stanislav; Janousek, Vojtech; 7468 words;
Pyroxene-biotite quartz monzodiorite of the Stepnovice ... Graben The Stepnovice dyke of pyroxene-biotite quartz monzodiorite, trending N-S, crops ... in this area is sillimanitecordierite-biotite migmatite. Geochronology The available ...
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Laser ablation ^sup 40^Ar/^sup 39^Ar dating of metamorphic fabrics in the Caledonides of north Ireland
Journal of the Geological Society; 3/1/2006; Condon, D J; Hodges, K V; Alsop, G I; White, A; 5972 words;
... 39^Ar dating of two texturally distinct biotite generations within a phyllite from the ... In this sample, an older generation of biotite (Bt^sub 1^) is aligned subparallel to ... shallow-dipping foliation. The second biotite generation (Bt^sub 2^) occurs as randomly ...
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Petrology, geochemistry, and U-Pb (zircon) age of the quartz-feldspar porphyry dyke at the Lake George antimony mine, New Brunswick: implications for origin, emplacement process, and mineralization.
Atlantic Geology; 3/1/2006; Leonard, P.R.R. Lentz, D.R. Poujol, M.; 8726 words;
... mm in length and zircon is typically usually less than 100 microns, both as inclusions in biotite and plagioclase. As zircon and apatite apparently began to crystallize early, they may not ... that the source magma for the granodioritic intrusion and QFP dyke crystallized amphibole and biotite during its ascent ...
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Petrology and geochemistry of the Bestvina granulite body metamorphosed at eclogite facies conditions, Bohemian Massif
Journal of the Czech Geological Society; 1/1/2005; Vrána, Stanislav; Stedrá, Veronika; Fisera, Milan; 4944 words;
... contain a mineral association gamet-kyanite-biotite-plagioclase-K-feldspar-quartz antiperthite ... composition (type II), and (4) kyanite-garnet-biotite migmatitic gneiss. These rocks are associated ... cores and the associated plagioclase and biotite, the geothermobarometric calculations ...
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Chemistry and mineralogy of orthogneisses in the northeastern part of the Moldanubicum
Journal of the Czech Geological Society; 1/1/2005; Breiter, Karel; Copjaková, Renata; Gabasová, Ananda; Skoda, Radek; 5088 words;
... Moldanubicum, Bohemian Massif, Czech Republic. Biotite orthogneisses are distributed in outer parts ... petrographie data in the explanations to geological maps at the scale of 1:200 000. Nemec - Psa (1986 ... rock chemical composition and mineralogy of biotite and leucocratic orthogneisses in order to ...
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The tourmaline-bearing granite pluton of Bodmin (Cornwall, UK): magnetic fabric study and regional inference
Journal of the Geological Society; 7/1/2006; Bouchez, Jean Luc; Nguema, Thierry Mintsa Mi; Esteban, Lionel; Siqueira, Roberto; Scrivener, Richard; 6257 words;
... lack of magnetite, comes from biotite and tourmaline. As the magneto-crystalli ... the specimens to enhance the biotite magnetic signal by the growth ... magnetic lineation and foliation maps provide invaluable data that ... to increase the AMS signal of biotite by growing mimetic magnetite out of ...
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Pre-eruptional magmatic zircon, neogene alboran volcanic province, SE Spain
Journal of the Geological Society; 7/1/2002; Zeck, H P; Whitehouse, M J; 2056 words;
Hornblende-biotite- (?)pyroxene dacite from Cerro Morron ... 0.15(2sigma) Ma (^sup 40^Ar/^sup 39^Ar biotite plateau ages), these two zircon generations ... magma. Like zircon, quartz, plagioclase, biotite and hornblende, major phenocryst phases ...
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^sup 40^Ar/^sup 39^Ar age constraints on ore deposition and cooling of the Bushveld Complex, South Africa
Journal of the Geological Society; 5/1/2004; Nomade, Sebastien; Renne, Paul R; Merkle, Roland K W; 4090 words;
... Bushveld Complex (South Africa). Eleven biotite crystals were selected from a production ... in K^sub 2^O (typically 0.01 wt%), so biotite was extracted from the +75 mm fraction ... It is not possible to relate individual biotite grains to any variations in the petrological ...
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Cavalli Seamount, Northland Plateau, SW Pacific Ocean: a Miocene metamorphic core complex?
Journal of the Geological Society; 11/1/2003; Mortimer, N; Herzer, R H; Walker, N W; Calvert, A T; Et al; 7259 words;
... dredged from Cavalli Seamount consist of biotite schist, with minor calc-silicate bands ... volcanic rocks but were instead dominated by biotite schist. In this paper we present the petrographie ... DlB comprised two subangular boulders of biotite schist. Lesser quantities of smaller schist ...
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Zeletice Group: Very low-grade Palaeozoic sequence at the base of Moravicum, Czech Republic
Journal of the Czech Geological Society; 1/1/2006; Leichmann, Jaromír; Kapinus, Andrej; Pivnicka, Lubos; Weber, Radek; 6089 words;
... Laznky-Heroltice limestones and below the biotite-bearing phylites of the Pernegg-Upper ... the western part contains phyllite with biotite. However, the Preclik's idea that an additional ... were documented below the marbles and biotite phyllites of the BiI Potok Group (= Pernegg ...
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Mercury concentrations in the bedrock of southwestern Nova Scotia: a reconnaissance study.
Atlantic Geology; 3/1/2005; Page, Krista D. Murphy, J. Brendan; 5742 words;
... are based on the 1:50 000-scale geological maps of the South Mountain Batholith (SMB) published ... granite lithologies into muscovite-rich and biotite-rich units. MacDonald (2001) divided the SMB ... plagioclase, and mafic minerals (primarily biotite), (2) texture, and (3) grain size. From relatively ...
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