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Statements

Subject Item
n2:RIV%2F00025798%3A_____%2F12%3A00000486%21RIV13-MSM-00025798
rdf:type
n9:Vysledek skos:Concept
rdfs:seeAlso
http://link.springer.com/article/10.1007/s00410-012-0772-2
dcterms:description
Samples of essentially “dry” high-pressure felsic granulites from the Bohemian Massif (Variscan belt of Central Europe) contain up to 2 mm large perthitic alkali feldspars with several generations of plagioclase precipitates in an orthoclase-rich host. The first generation takes the form of lenses homogeneous in size whereas the size of a second generation of very thin albite-rich precipitates is more variable with comparatively high aspect ratios. In the vicinity of large kyanite, garnet or quartz inclusions, the first generation of plagioclase precipitates is significantly less abundant, the microstructure is coarser than in the remainder of the perthitic grain, and the host is a tweed orthoclase. The first generation of precipitates formed at around 850°C during the high pressure stage (16-18 kbar) of metamorphism. Primary exsolution was followed by primary coarsening of the plagioclase precipitates which still took place at high-temperatures (850-700 °C). The coarsening was pronounced due to the access of fluids in the outer portions of the perthitic alkali feldspar and in more internal regions around large inclusions. The second generation of albite-rich precipitates was formed at around 570 °C. TEM investigations revealed that the interfaces between the second generation plagioclase lamellae and the orthoclase-rich host are coherent or semi coherent. During late evolutionary stages of the perthite, albite linings were formed at phase boundaries and the perthitic microstructure was partially replaced by irregularly shaped precipitates of pure albite with incoherent interfaces. The albitization occurred below 400°C and was linked to fluid infiltration in the course of deuteric alteration. Based on size distribution analysis, it is inferred that the precipitates of the first generation were most probably formed by spinodal decomposition whereas the precipitates of the second generation rather were formed by nucleation and growth. Samples of essentially “dry” high-pressure felsic granulites from the Bohemian Massif (Variscan belt of Central Europe) contain up to 2 mm large perthitic alkali feldspars with several generations of plagioclase precipitates in an orthoclase-rich host. The first generation takes the form of lenses homogeneous in size whereas the size of a second generation of very thin albite-rich precipitates is more variable with comparatively high aspect ratios. In the vicinity of large kyanite, garnet or quartz inclusions, the first generation of plagioclase precipitates is significantly less abundant, the microstructure is coarser than in the remainder of the perthitic grain, and the host is a tweed orthoclase. The first generation of precipitates formed at around 850°C during the high pressure stage (16-18 kbar) of metamorphism. Primary exsolution was followed by primary coarsening of the plagioclase precipitates which still took place at high-temperatures (850-700 °C). The coarsening was pronounced due to the access of fluids in the outer portions of the perthitic alkali feldspar and in more internal regions around large inclusions. The second generation of albite-rich precipitates was formed at around 570 °C. TEM investigations revealed that the interfaces between the second generation plagioclase lamellae and the orthoclase-rich host are coherent or semi coherent. During late evolutionary stages of the perthite, albite linings were formed at phase boundaries and the perthitic microstructure was partially replaced by irregularly shaped precipitates of pure albite with incoherent interfaces. The albitization occurred below 400°C and was linked to fluid infiltration in the course of deuteric alteration. Based on size distribution analysis, it is inferred that the precipitates of the first generation were most probably formed by spinodal decomposition whereas the precipitates of the second generation rather were formed by nucleation and growth.
dcterms:title
Intracrystal microtextures in alkali feldspars from fluid deficient felsic granulites: A chemical and TEM study Intracrystal microtextures in alkali feldspars from fluid deficient felsic granulites: A chemical and TEM study
skos:prefLabel
Intracrystal microtextures in alkali feldspars from fluid deficient felsic granulites: A chemical and TEM study Intracrystal microtextures in alkali feldspars from fluid deficient felsic granulites: A chemical and TEM study
skos:notation
RIV/00025798:_____/12:00000486!RIV13-MSM-00025798
n9:predkladatel
n18:ico%3A00025798
n3:aktivita
n15:I
n3:aktivity
I
n3:cisloPeriodika
4
n3:dodaniDat
n6:2013
n3:domaciTvurceVysledku
n16:2100185
n3:druhVysledku
n17:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n5:predkladatel
n3:idSjednocenehoVysledku
142748
n3:idVysledku
RIV/00025798:_____/12:00000486
n3:jazykVysledku
n19:eng
n3:klicovaSlova
feldspars, perthite, spinodal decomposition, nucleation, granulites, TEM
n3:klicoveSlovo
n10:granulites n10:nucleation n10:TEM n10:perthite n10:feldspars n10:spinodal%20decomposition
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[264446E1A6C5]
n3:nazevZdroje
Contributions to Mineralogy and Petrology
n3:obor
n13:DB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
5
n3:rokUplatneniVysledku
n6:2012
n3:svazekPeriodika
164
n3:tvurceVysledku
Tajčmanová, Lucie Abart, Rainer Rhede, Dieter Wirth, Richard Habler, Gerlinde
n3:wos
000308724300011
s:issn
0010-7999
s:numberOfPages
15
n14:doi
10.1007/s00410-012-0772-2