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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F12%3A33140401%21RIV13-MSM-15310___
rdf:type
skos:Concept n12:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.chemer.2011.11.002
dcterms:description
The Fe-Mn-rich garnetites (coticules) associated with banded iron formations occur in the Neoproterozoic metamorphic complex of the Desná Unit. Their mineral assemblage consists of almandine-spessartine garnet, quartz, magnetite, epidote and sporadically biotite, chlorite, amphibole, plagioclase, calcite, ilmenite and apatite. The mineralogical, petrological and geochemical results demonstrate that the protolith of coticules and associated BIFs was formed during periods of submarine hydrothermal activity in the Late Proterozoic by differential precipitation of Fe and Mn from low-temperature solutions. The Fe-Mn-rich precipitates mixed to a varied degree with the detritic siliciclastic material. Subsequently the protolith underwent polyphase metamorphism reaching the amphibolite facies grade during the pre-Variscan (M1) and Variscan periods. The P-T conditions assumed for the peak Variscan metamorphism (M2) are T ?540-580 °C and P ?600 MPa, the M3 is characterized by an upper pressure limit 400 MPa at a maximum temperature of 600 °C and a metamorphic event M4 related to the hydration reactions which occurred during the late-stage of the Variscan orogenesis is characterized by T ?150-300 °C at P {200 MPa. The Fe-Mn-rich garnetites (coticules) associated with banded iron formations occur in the Neoproterozoic metamorphic complex of the Desná Unit. Their mineral assemblage consists of almandine-spessartine garnet, quartz, magnetite, epidote and sporadically biotite, chlorite, amphibole, plagioclase, calcite, ilmenite and apatite. The mineralogical, petrological and geochemical results demonstrate that the protolith of coticules and associated BIFs was formed during periods of submarine hydrothermal activity in the Late Proterozoic by differential precipitation of Fe and Mn from low-temperature solutions. The Fe-Mn-rich precipitates mixed to a varied degree with the detritic siliciclastic material. Subsequently the protolith underwent polyphase metamorphism reaching the amphibolite facies grade during the pre-Variscan (M1) and Variscan periods. The P-T conditions assumed for the peak Variscan metamorphism (M2) are T ?540-580 °C and P ?600 MPa, the M3 is characterized by an upper pressure limit 400 MPa at a maximum temperature of 600 °C and a metamorphic event M4 related to the hydration reactions which occurred during the late-stage of the Variscan orogenesis is characterized by T ?150-300 °C at P {200 MPa.
dcterms:title
Origin and metamorphic evolution of Fe-Mn-rich garnetites (coticules) in the Desná Unit (Silesicum, NE Bohemian Massif) Origin and metamorphic evolution of Fe-Mn-rich garnetites (coticules) in the Desná Unit (Silesicum, NE Bohemian Massif)
skos:prefLabel
Origin and metamorphic evolution of Fe-Mn-rich garnetites (coticules) in the Desná Unit (Silesicum, NE Bohemian Massif) Origin and metamorphic evolution of Fe-Mn-rich garnetites (coticules) in the Desná Unit (Silesicum, NE Bohemian Massif)
skos:notation
RIV/61989592:15310/12:33140401!RIV13-MSM-15310___
n12:predkladatel
n13:orjk%3A15310
n3:aktivita
n20:S n20:P n20:I
n3:aktivity
I, P(GP205/07/P130), S
n3:cisloPeriodika
3
n3:dodaniDat
n15:2013
n3:domaciTvurceVysledku
n17:2790629 n17:5384443
n3:druhVysledku
n4:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
157118
n3:idVysledku
RIV/61989592:15310/12:33140401
n3:jazykVysledku
n21:eng
n3:klicovaSlova
Garnetites, Coticules, Banded iron formations, Desná Unit, Silesicum, Variscan metamorphism
n3:klicoveSlovo
n6:Desn%C3%A1%20Unit n6:Banded%20iron%20formations n6:Garnetites n6:Coticules n6:Silesicum n6:Variscan%20metamorphism
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[74CDFE081E01]
n3:nazevZdroje
Chemie der Erde-Geochemistry
n3:obor
n18:DB
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
3
n3:projekt
n14:GP205%2F07%2FP130
n3:rokUplatneniVysledku
n15:2012
n3:svazekPeriodika
72
n3:tvurceVysledku
Zimák, Jiří Buriánek, David Kropáč, Kamil
s:issn
0009-2819
s:numberOfPages
18
n7:doi
10.1016/j.chemer.2011.11.002
n19:organizacniJednotka
15310