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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10127916%21RIV14-MSM-11310___
rdf:type
skos:Concept n12:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.gca.2012.09.050
dcterms:description
Highly siderophile element (HSE - Re, Os, Ir, Ru, Rh, Pd, Pt, and Au) and S abundances, sulphide petrography and 187Os/188Os compositions of two distinct suites - Mg-lherzolite and Fe-dunite/wehrlite accompanied by pyroxenites from Horní Bory, Bohemian Massif, Czech Republic are reported. The Mg-lherzolite suite is enriched in IPGE (Os, Ir, and Ru), moderately depleted in Pd, Pt and S, and has osmium isotopic compositions similar to that of the Phanerozoic convecting mantle. Such a composition can be best explained by reaction between previously depleted peridotite and sulphur-undersaturated melt at low melt-rock ratios. This reaction was associated with precipitation of IPGE alloys and Pt-As. The Fe-dunite/wehrlite suite is depleted in IPGE, enriched in Pd, Pt, and S and has radiogenic osmium isotopic compositions. The origin of this suite reflects melt-rock reaction between peridotite and subduction-related melt at high melt/rock ratios resulting in breakdown of primary sulphides and their replacement by HSE-poor but 187Os-enriched sulphides. Mass-balance calculations and relations between HSE and S contents show that, while most of the Re is trapped in base metal sulphides (BMS), only up to 28% of the rest of the HSE (Os, Ir, Ru, Pd, Pt) are accommodated in BMS. Several Pt-As phases discovered in Mg-lherzolite and Fe-dunite/wehrlite and Os-Ru phase found in Mg-lherzolite suggesting complex behaviour of HSE during melt-rock reactions depending on melt composition and melt/rock ratios. The Re-Os data for the Fe-wehrlite/dunite and pyroxenite rocks yield an errorchon age of 334+-19Ma, which is similar to the age of other high temperature/pressure rocks from Gföhl Nappe (Moldanubian Zone, Bohemian Massif); this age likely corresponds to the time of melt-rock reactions and subduction. Highly siderophile element (HSE - Re, Os, Ir, Ru, Rh, Pd, Pt, and Au) and S abundances, sulphide petrography and 187Os/188Os compositions of two distinct suites - Mg-lherzolite and Fe-dunite/wehrlite accompanied by pyroxenites from Horní Bory, Bohemian Massif, Czech Republic are reported. The Mg-lherzolite suite is enriched in IPGE (Os, Ir, and Ru), moderately depleted in Pd, Pt and S, and has osmium isotopic compositions similar to that of the Phanerozoic convecting mantle. Such a composition can be best explained by reaction between previously depleted peridotite and sulphur-undersaturated melt at low melt-rock ratios. This reaction was associated with precipitation of IPGE alloys and Pt-As. The Fe-dunite/wehrlite suite is depleted in IPGE, enriched in Pd, Pt, and S and has radiogenic osmium isotopic compositions. The origin of this suite reflects melt-rock reaction between peridotite and subduction-related melt at high melt/rock ratios resulting in breakdown of primary sulphides and their replacement by HSE-poor but 187Os-enriched sulphides. Mass-balance calculations and relations between HSE and S contents show that, while most of the Re is trapped in base metal sulphides (BMS), only up to 28% of the rest of the HSE (Os, Ir, Ru, Pd, Pt) are accommodated in BMS. Several Pt-As phases discovered in Mg-lherzolite and Fe-dunite/wehrlite and Os-Ru phase found in Mg-lherzolite suggesting complex behaviour of HSE during melt-rock reactions depending on melt composition and melt/rock ratios. The Re-Os data for the Fe-wehrlite/dunite and pyroxenite rocks yield an errorchon age of 334+-19Ma, which is similar to the age of other high temperature/pressure rocks from Gföhl Nappe (Moldanubian Zone, Bohemian Massif); this age likely corresponds to the time of melt-rock reactions and subduction.
dcterms:title
Highly siderophile element geochemistry of peridotites and pyroxenites from Horni Bory, Bohemian Massif: Implications for HSE behaviour in subduction-related upper mantle Highly siderophile element geochemistry of peridotites and pyroxenites from Horni Bory, Bohemian Massif: Implications for HSE behaviour in subduction-related upper mantle
skos:prefLabel
Highly siderophile element geochemistry of peridotites and pyroxenites from Horni Bory, Bohemian Massif: Implications for HSE behaviour in subduction-related upper mantle Highly siderophile element geochemistry of peridotites and pyroxenites from Horni Bory, Bohemian Massif: Implications for HSE behaviour in subduction-related upper mantle
skos:notation
RIV/00216208:11310/13:10127916!RIV14-MSM-11310___
n12:predkladatel
n13:orjk%3A11310
n3:aktivita
n4:P n4:Z n4:I
n3:aktivity
I, P(KJB300130902), Z(AV0Z30130516), Z(MSM0021620855)
n3:cisloPeriodika
1
n3:dodaniDat
n7:2014
n3:domaciTvurceVysledku
n14:8153205 n14:8897247
n3:druhVysledku
n20:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n21:predkladatel
n3:idSjednocenehoVysledku
77409
n3:idVysledku
RIV/00216208:11310/13:10127916
n3:jazykVysledku
n8:eng
n3:klicovaSlova
sulfide; subduction; siderophile element; pyroxenite; precipitation (chemistry); platinum group element; petrography; peridotite; osmium isotope; nappe; mass balance; isotopic composition; igneous geochemistry; high temperature; high pressure; alloy
n3:klicoveSlovo
n6:petrography n6:igneous%20geochemistry n6:high%20pressure n6:pyroxenite n6:osmium%20isotope n6:platinum%20group%20element n6:peridotite n6:sulfide n6:nappe n6:mass%20balance n6:alloy n6:siderophile%20element n6:precipitation%20%28chemistry%29 n6:subduction n6:high%20temperature n6:isotopic%20composition
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[E3D231222F7E]
n3:nazevZdroje
Geochimica et Cosmohimica Acta
n3:obor
n10:DD
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
7
n3:projekt
n11:KJB300130902
n3:rokUplatneniVysledku
n7:2013
n3:svazekPeriodika
100
n3:tvurceVysledku
Puchtel, Igor S. Ackerman, Lukas Rohovec, Jan Pitcher, Lynnette Jelínek, Emil Strnad, Ladislav Walker, Richard J.
n3:wos
000312102100009
n3:zamer
n5:AV0Z30130516 n5:MSM0021620855
s:issn
0016-7037
s:numberOfPages
18
n19:doi
10.1016/j.gca.2012.09.050
n17:organizacniJednotka
11310