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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F12%3A10133917%21RIV13-MSM-11310___
rdf:type
skos:Concept n7:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.3749/canmin.50.4.1131
dcterms:description
A 1596-m-deep borehole (CS-1) located in the central part of the Cinovec (Zinnwald) granite cupola mineralized in Sn and W intersected zinnwaldite granite (ZG) followed by lithian annite (%22protolithionite%22) granite (PG). These two types of granite are separated by a transition zone (TZ). We studied the chemical composition of major mineral phases (plagioclase, K-feldspar, micas) by EPMA and LA-ICP-MS analyses. The plagioclase composition corresponds to albite (Ab(99.6-91.1)) containing 0.09 to 0.18 wt.% Rb2O. Albite crystallized from the magma. K-feldspar is perthitic and shows an increase in Rb concentration (up to 0.83 wt.% Rb2O) in the apical part of the cupola. The partition coefficient K-D-Rb(Mi-Kfs) is constant throughout the cupola, indicating a systematic re-equilibration of these two minerals with fluid. Lithian annite occurs below -735 m. Its F content decreases with depth and from -940.5 m, OH exceeds F. Magnesium and Ti concentrations show a remarkable positive correlation with depth. The TZ and adjacent area are characterized by strong variations in the chemical composition of micas, reflecting the fluctuation of saturation-oversaturation of residual liquid by a F-rich fluid phase. The Rb concentration in zinnwaldite (up to 2 wt.% Rb2O) strongly increases in the apical part of the cupola owing to a significant transfer of volatiles. The chemical composition of mica evolves gradually from the TZ to the apical zone. The discovery of lithian annite included in quartz at -97 m indicates the formation of zinnwaldite by interaction of lithian annite with F-rich fluid. The octahedral site of lithian annite allows the incorporation of Sn, Nb, Ta and W, replacing Ti. Because of the lithian annite -> zinnwaldite transformation, these elements with higher ionic charges are expelled from the mica structure, transferred to the fluid phase and concentrated in the apical part of the cupola. A 1596-m-deep borehole (CS-1) located in the central part of the Cinovec (Zinnwald) granite cupola mineralized in Sn and W intersected zinnwaldite granite (ZG) followed by lithian annite (%22protolithionite%22) granite (PG). These two types of granite are separated by a transition zone (TZ). We studied the chemical composition of major mineral phases (plagioclase, K-feldspar, micas) by EPMA and LA-ICP-MS analyses. The plagioclase composition corresponds to albite (Ab(99.6-91.1)) containing 0.09 to 0.18 wt.% Rb2O. Albite crystallized from the magma. K-feldspar is perthitic and shows an increase in Rb concentration (up to 0.83 wt.% Rb2O) in the apical part of the cupola. The partition coefficient K-D-Rb(Mi-Kfs) is constant throughout the cupola, indicating a systematic re-equilibration of these two minerals with fluid. Lithian annite occurs below -735 m. Its F content decreases with depth and from -940.5 m, OH exceeds F. Magnesium and Ti concentrations show a remarkable positive correlation with depth. The TZ and adjacent area are characterized by strong variations in the chemical composition of micas, reflecting the fluctuation of saturation-oversaturation of residual liquid by a F-rich fluid phase. The Rb concentration in zinnwaldite (up to 2 wt.% Rb2O) strongly increases in the apical part of the cupola owing to a significant transfer of volatiles. The chemical composition of mica evolves gradually from the TZ to the apical zone. The discovery of lithian annite included in quartz at -97 m indicates the formation of zinnwaldite by interaction of lithian annite with F-rich fluid. The octahedral site of lithian annite allows the incorporation of Sn, Nb, Ta and W, replacing Ti. Because of the lithian annite -> zinnwaldite transformation, these elements with higher ionic charges are expelled from the mica structure, transferred to the fluid phase and concentrated in the apical part of the cupola.
dcterms:title
EVOLUTION OF THE CINOVEC (ZINNWALD) GRANITE CUPOLA, CZECH REPUBLIC: COMPOSITION OF FELDSPARS AND MICAS, A CLUE TO THE ORIGIN OF W, Sn MINERALIZATION EVOLUTION OF THE CINOVEC (ZINNWALD) GRANITE CUPOLA, CZECH REPUBLIC: COMPOSITION OF FELDSPARS AND MICAS, A CLUE TO THE ORIGIN OF W, Sn MINERALIZATION
skos:prefLabel
EVOLUTION OF THE CINOVEC (ZINNWALD) GRANITE CUPOLA, CZECH REPUBLIC: COMPOSITION OF FELDSPARS AND MICAS, A CLUE TO THE ORIGIN OF W, Sn MINERALIZATION EVOLUTION OF THE CINOVEC (ZINNWALD) GRANITE CUPOLA, CZECH REPUBLIC: COMPOSITION OF FELDSPARS AND MICAS, A CLUE TO THE ORIGIN OF W, Sn MINERALIZATION
skos:notation
RIV/00216208:11310/12:10133917!RIV13-MSM-11310___
n7:predkladatel
n8:orjk%3A11310
n3:aktivita
n15:Z
n3:aktivity
Z(MSM0021620855)
n3:cisloPeriodika
4
n3:dodaniDat
n13:2013
n3:domaciTvurceVysledku
n19:8153205
n3:druhVysledku
n5:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
135305
n3:idVysledku
RIV/00216208:11310/12:10133917
n3:jazykVysledku
n11:eng
n3:klicovaSlova
Czech Republic; Cinovec (Zinnwald); metallogenic model; F-rich fluid; lithian annite -> zinnwaldite transformation; Sn, Nb, Ta and W concentrations in micas; lithian annite; zinnwaldite; granite cupola
n3:klicoveSlovo
n4:Czech%20Republic n4:zinnwaldite n4:Ta%20and%20W%20concentrations%20in%20micas n4:Cinovec%20%28Zinnwald%29 n4:metallogenic%20model n4:Nb n4:granite%20cupola n4:F-rich%20fluid n4:Sn n4:lithian%20annite n4:lithian%20annite%20-%3E%20zinnwaldite%20transformation
n3:kodStatuVydavatele
CA - Kanada
n3:kontrolniKodProRIV
[BC2596C25401]
n3:nazevZdroje
Canadian Mineralogist
n3:obor
n12:DB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n13:2012
n3:svazekPeriodika
50
n3:tvurceVysledku
Strnad, Ladislav Johan, Zdenek Johan, Vera
n3:wos
000314174400021
n3:zamer
n10:MSM0021620855
s:issn
0008-4476
s:numberOfPages
18
n21:doi
10.3749/canmin.50.4.1131
n18:organizacniJednotka
11310