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Statements

Subject Item
n2:RIV%2F67985831%3A_____%2F12%3A00389603%21RIV13-AV0-67985831
rdf:type
n10:Vysledek skos:Concept
dcterms:description
The Moldanubian domain of the Variscan Bohemian Massif is characterized by a large number of rare-element pegmatites, which are of possible economic importance. In order to investigate timing relationships between emplacements of Li-bearing rare-element pegmatites and the tectonometamorphic and magmatic evolution of this domain, 10 in situ U–Pb dates of minerals of the columbite–tantalite group from eight rare-element pegmatites, belonging to different pegmatite fields, have been obtained by the LA–SF–ICP–MS technique. As in former studies, our results suggest that assimilation of common Pb is very limited, and diffusion of radiogenic Pb is of minimal importance in columbite. Two ages of emplacement have been obtained. An older episode at 333 + 3 Ma follows closely the generalized melting event that occurred at the end of the Moravo–Moldanubian phase, during exhumation of high-pressure rocks. The younger episode, at 325 + 4 Ma, seems to have been contemporaneous with the beginning of the Bavarian phase. The emplacement of Li-bearing rare-element pegmatites in the Moldanubian domain is the oldest known magmatic event involving rare element-enriched melts during the Variscan orogeny. Our results show that the emplacement of Li-bearing rare-element pegmatites is not genetically related with the granulite-facies metamorphism of the lower crust. Rather, the magmas could have originated directly by partial melting linked the formation of migmatites contemporaneous with the exhumation of high-pressure rocks. The Moldanubian domain of the Variscan Bohemian Massif is characterized by a large number of rare-element pegmatites, which are of possible economic importance. In order to investigate timing relationships between emplacements of Li-bearing rare-element pegmatites and the tectonometamorphic and magmatic evolution of this domain, 10 in situ U–Pb dates of minerals of the columbite–tantalite group from eight rare-element pegmatites, belonging to different pegmatite fields, have been obtained by the LA–SF–ICP–MS technique. As in former studies, our results suggest that assimilation of common Pb is very limited, and diffusion of radiogenic Pb is of minimal importance in columbite. Two ages of emplacement have been obtained. An older episode at 333 + 3 Ma follows closely the generalized melting event that occurred at the end of the Moravo–Moldanubian phase, during exhumation of high-pressure rocks. The younger episode, at 325 + 4 Ma, seems to have been contemporaneous with the beginning of the Bavarian phase. The emplacement of Li-bearing rare-element pegmatites in the Moldanubian domain is the oldest known magmatic event involving rare element-enriched melts during the Variscan orogeny. Our results show that the emplacement of Li-bearing rare-element pegmatites is not genetically related with the granulite-facies metamorphism of the lower crust. Rather, the magmas could have originated directly by partial melting linked the formation of migmatites contemporaneous with the exhumation of high-pressure rocks.
dcterms:title
How are the emplacement of rare-element pegmatites, regional metamorphism and magmatism interrelated in the Moldanubian domain of the Variscan Bohemian Massif, Czech Republic? How are the emplacement of rare-element pegmatites, regional metamorphism and magmatism interrelated in the Moldanubian domain of the Variscan Bohemian Massif, Czech Republic?
skos:prefLabel
How are the emplacement of rare-element pegmatites, regional metamorphism and magmatism interrelated in the Moldanubian domain of the Variscan Bohemian Massif, Czech Republic? How are the emplacement of rare-element pegmatites, regional metamorphism and magmatism interrelated in the Moldanubian domain of the Variscan Bohemian Massif, Czech Republic?
skos:notation
RIV/67985831:_____/12:00389603!RIV13-AV0-67985831
n10:predkladatel
n11:ico%3A67985831
n3:aktivita
n14:S n14:I
n3:aktivity
I, S
n3:cisloPeriodika
6
n3:dodaniDat
n6:2013
n3:domaciTvurceVysledku
n7:2882442
n3:druhVysledku
n12:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
139665
n3:idVysledku
RIV/67985831:_____/12:00389603
n3:jazykVysledku
n8:eng
n3:klicovaSlova
LCT pegmatite; rare-element-enriched magma; columbite-tantalite; LA-SF-ICP-MS dating; Variscan orogeny; Bohemian Massif; Moldanubian domain; Bohemian Massif (Czech Republic)
n3:klicoveSlovo
n9:Bohemian%20Massif%20%28Czech%20Republic%29 n9:rare-element-enriched%20magma n9:LA-SF-ICP-MS%20dating n9:Bohemian%20Massif n9:columbite-tantalite n9:LCT%20pegmatite n9:Moldanubian%20domain n9:Variscan%20orogeny
n3:kodStatuVydavatele
CA - Kanada
n3:kontrolniKodProRIV
[3FE856D5AAC1]
n3:nazevZdroje
Canadian Mineralogist
n3:obor
n18:DB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
5
n3:rokUplatneniVysledku
n6:2012
n3:svazekPeriodika
50
n3:tvurceVysledku
Novák, M. Melleton, J. Breiter, Karel Frei, D. Gloaguen, E.
n3:wos
000314295200019
s:issn
0008-4476
s:numberOfPages
23
n16:doi
10.3749/canmin.50.6.1751