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Statements

Subject Item
n2:RIV%2F67985831%3A_____%2F14%3A00442177%21RIV15-AV0-67985831
rdf:type
n10:Vysledek skos:Concept
dcterms:description
Clastic metasedimentary rocks from the Tepla Crystalline Complex (western Bohemian Massif) were analysed for major and trace elements, Sr and Nd isotopes. The metamorphic grade of these rocks of presumed Neoproterozoic protolith age increases from SE to NW from very low-grade to amphibolite-facies conditions. Geochemistry indicates that the sedimentary protoliths for the whole sequence consisted of immature (pelitic) greywackes chiefly derived from an ensialic island arc. No significant changes in composition from the lowest to the highest grade or across the strike of isograds were observed. Chemical variations between original slates and greywackes within a single locality often considerably exceed the variation among samples of different metamorphic grades or of different geographic positions. The prevailing REE spectra with distinct negative Eu anomalies show a close similarity with those of modern turbidites from ensialic island arcs. Several samples without any Eu anomaly resemble the REE patterns of less differentiated island arc andesites. LREE leaching under oxidizing conditions is suggested by several REE patterns with positive Ce anomalies. The Sm-Nd model ages T-DM of samples with Ce positive anomalies are higher (T-DM 1.8-2.0 Ga) than those of all other samples (T-DM = 1.1-1.5 Ga). Initial Sr isotopic ratios for all samples are fairly constant and compatible with an assumed dominance of isotopically less evolved detrital material. Geochemical characteristics of the clastic metasediments of the Tepla Crystalline Complex are thus consistent with a model of incorporation and preservation of arc-derived sediments in a Cadomian accretionary wedge. Clastic metasedimentary rocks from the Tepla Crystalline Complex (western Bohemian Massif) were analysed for major and trace elements, Sr and Nd isotopes. The metamorphic grade of these rocks of presumed Neoproterozoic protolith age increases from SE to NW from very low-grade to amphibolite-facies conditions. Geochemistry indicates that the sedimentary protoliths for the whole sequence consisted of immature (pelitic) greywackes chiefly derived from an ensialic island arc. No significant changes in composition from the lowest to the highest grade or across the strike of isograds were observed. Chemical variations between original slates and greywackes within a single locality often considerably exceed the variation among samples of different metamorphic grades or of different geographic positions. The prevailing REE spectra with distinct negative Eu anomalies show a close similarity with those of modern turbidites from ensialic island arcs. Several samples without any Eu anomaly resemble the REE patterns of less differentiated island arc andesites. LREE leaching under oxidizing conditions is suggested by several REE patterns with positive Ce anomalies. The Sm-Nd model ages T-DM of samples with Ce positive anomalies are higher (T-DM 1.8-2.0 Ga) than those of all other samples (T-DM = 1.1-1.5 Ga). Initial Sr isotopic ratios for all samples are fairly constant and compatible with an assumed dominance of isotopically less evolved detrital material. Geochemical characteristics of the clastic metasediments of the Tepla Crystalline Complex are thus consistent with a model of incorporation and preservation of arc-derived sediments in a Cadomian accretionary wedge.
dcterms:title
Lithogeochemistry and Sr-Nd isotopic composition of Neoproterozoic metasedimentary rocks of the Teplá Crystalline Complex, western Bohemian Massif: a geotectonic interpretation Lithogeochemistry and Sr-Nd isotopic composition of Neoproterozoic metasedimentary rocks of the Teplá Crystalline Complex, western Bohemian Massif: a geotectonic interpretation
skos:prefLabel
Lithogeochemistry and Sr-Nd isotopic composition of Neoproterozoic metasedimentary rocks of the Teplá Crystalline Complex, western Bohemian Massif: a geotectonic interpretation Lithogeochemistry and Sr-Nd isotopic composition of Neoproterozoic metasedimentary rocks of the Teplá Crystalline Complex, western Bohemian Massif: a geotectonic interpretation
skos:notation
RIV/67985831:_____/14:00442177!RIV15-AV0-67985831
n4:aktivita
n9:I
n4:aktivity
I
n4:cisloPeriodika
4
n4:dodaniDat
n5:2015
n4:domaciTvurceVysledku
n6:8643113 n6:4573463
n4:druhVysledku
n11:J
n4:duvernostUdaju
n16:S
n4:entitaPredkladatele
n14:predkladatel
n4:idSjednocenehoVysledku
26387
n4:idVysledku
RIV/67985831:_____/14:00442177
n4:jazykVysledku
n13:eng
n4:klicovaSlova
metasedimentary rocks; geochemistry; Sr-Nd isotopes; provenance; Tepla Crystalline Complex; Bohemian Massif
n4:klicoveSlovo
n8:Tepla%20Crystalline%20Complex n8:Bohemian%20Massif n8:Sr-Nd%20isotopes n8:provenance n8:metasedimentary%20rocks n8:geochemistry
n4:kodStatuVydavatele
CZ - Česká republika
n4:kontrolniKodProRIV
[4DCA60F8E66E]
n4:nazevZdroje
Journal of Geosciences
n4:obor
n17:DD
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
4
n4:rokUplatneniVysledku
n5:2014
n4:svazekPeriodika
59
n4:tvurceVysledku
Henjes-Kunst, F. Vejnar, Zdeněk Fiala, Jiří Müller-Sigmund, H.
n4:wos
000346149500002
s:issn
1802-6222
s:numberOfPages
19
n15:doi
10.3190/jgeosci.182