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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10139589%21RIV14-MSM-11310___
rdf:type
n8:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.3190/jgeosci.131
dcterms:description
A strongly layered garnet pyroxenite, consisting of cm-scale layers of garnetite, garnet orthopyroxenite, garnet clinopyroxenite, and websterite, occurs in the Biskupice garnet peridotite, which is located in migmatitic gneiss of the Gföhl Assemblage in the Vysočina District, western Moravia. Major- and trace-element compositions and REE patterns of minerals and layers in the pyroxenite are consistent with origin of the layers by HT-HP crystallization and accumulation of variable proportions of garnet, orthopyroxene, and clinopyroxene. The present compositions of the minerals (pyroperich garnet, low-Al, low-Ca enstatite and low-Al, high-Ca diopside) are the result of extensive subsolidus re-equilibration at ~900 oC and ~37 kbar, during the Variscan (332 Ma) Orogeny. Neodymium and strontium isotopic values (ε335Nd, +1.8 to +2.1; (87Sr/86Sr) 335, 0.7049) and negative HFSE anomalies indicate a crustal component in the melt from which the layers crystallized. Most garnet pyroxenites and eclogites in Gföhl garnet peridotites are thought to have formed by HT-HP crystallization from silicate melts containing crustal components, and the Biskupice garnet pyroxenite is an excellent example of such a petrogenetic process. A strongly layered garnet pyroxenite, consisting of cm-scale layers of garnetite, garnet orthopyroxenite, garnet clinopyroxenite, and websterite, occurs in the Biskupice garnet peridotite, which is located in migmatitic gneiss of the Gföhl Assemblage in the Vysočina District, western Moravia. Major- and trace-element compositions and REE patterns of minerals and layers in the pyroxenite are consistent with origin of the layers by HT-HP crystallization and accumulation of variable proportions of garnet, orthopyroxene, and clinopyroxene. The present compositions of the minerals (pyroperich garnet, low-Al, low-Ca enstatite and low-Al, high-Ca diopside) are the result of extensive subsolidus re-equilibration at ~900 oC and ~37 kbar, during the Variscan (332 Ma) Orogeny. Neodymium and strontium isotopic values (ε335Nd, +1.8 to +2.1; (87Sr/86Sr) 335, 0.7049) and negative HFSE anomalies indicate a crustal component in the melt from which the layers crystallized. Most garnet pyroxenites and eclogites in Gföhl garnet peridotites are thought to have formed by HT-HP crystallization from silicate melts containing crustal components, and the Biskupice garnet pyroxenite is an excellent example of such a petrogenetic process.
dcterms:title
Garnet pyroxenite in the Biskupice peridotite, Bohemian Massif: anatomy of a Variscan high-pressure cumulate Garnet pyroxenite in the Biskupice peridotite, Bohemian Massif: anatomy of a Variscan high-pressure cumulate
skos:prefLabel
Garnet pyroxenite in the Biskupice peridotite, Bohemian Massif: anatomy of a Variscan high-pressure cumulate Garnet pyroxenite in the Biskupice peridotite, Bohemian Massif: anatomy of a Variscan high-pressure cumulate
skos:notation
RIV/00216208:11310/13:10139589!RIV14-MSM-11310___
n8:predkladatel
n9:orjk%3A11310
n3:aktivita
n18:I n18:Z
n3:aktivity
I, Z(MSM0021620855)
n3:cisloPeriodika
1
n3:dodaniDat
n11:2014
n3:domaciTvurceVysledku
n4:8153205 n4:8897247
n3:druhVysledku
n15:J
n3:duvernostUdaju
n21:S
n3:entitaPredkladatele
n7:predkladatel
n3:idSjednocenehoVysledku
76180
n3:idVysledku
RIV/00216208:11310/13:10139589
n3:jazykVysledku
n14:eng
n3:klicovaSlova
P-T conditions; O isotopes; Sr and Nd isotopes; geochemistry; Moldanubian; pyroxenite
n3:klicoveSlovo
n5:Moldanubian n5:Sr%20and%20Nd%20isotopes n5:pyroxenite n5:P-T%20conditions n5:geochemistry n5:O%20isotopes
n3:kodStatuVydavatele
CA - Kanada
n3:kontrolniKodProRIV
[AA1D1863FD38]
n3:nazevZdroje
Journal of Geosciences
n3:obor
n20:DB
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
6
n3:rokUplatneniVysledku
n11:2013
n3:svazekPeriodika
58
n3:tvurceVysledku
Jelínek, Emil Valley, John W. Medaris, L. Gordon Jr. Beard, Brian L. Spicuzza, Michael J. Strnad, Ladislav
n3:wos
000324553000002
n3:zamer
n16:MSM0021620855
s:issn
1802-6222
s:numberOfPages
17
n6:doi
10.3190/jgeosci.131
n17:organizacniJednotka
11310