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Statements

Subject Item
n2:RIV%2F00094862%3A_____%2F14%3A%230001661%21RIV15-MK0-00094862
rdf:type
skos:Concept n17:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.lithos.2014.03.030
dcterms:description
The calcite marble-hosted gem corundum (ruby, sapphire) occurrence near Revelstoke, British Columbia, Canada, occurs in the Monashee Complex of the Omineca Belt of the Canadian Cordillera. Petrography of the silicate layers show that corundum formed from muscovite at the peak of metamorphism (similar to 650-700 degrees C at 8.5-9 kbar). Because the marble is almost pure calcite (dolomite is very rare), the corundum was preserved because it did not react with dolomite to spinel + calcite during decompression. The scapolite-bearing assemblages formed during or after decompression of the rock at similar to 650 degrees C and 4-6 kbar. Gem-quality corundum crystals formed especially on borders of the mica-feldspar layers in an assemblage with calcite. Whole rock geochemistry data show that the corundum-bearing silicate (mica-feldspar) layers formed by mechanical mixing of carbonate with the host gneiss protolith; the bulk composition of the silicate layers was modified by Si and Fe depletion during prograde metamorphism. High element mobility is supported by the homogenization of delta O-18 and delta C-13 values in carbonates and silicates for the marble and silicate layers. The silicate layers and the gneiss contain elevated contents of Cr and V due to the volcanoclastic component of their protolith. The calcite marble-hosted gem corundum (ruby, sapphire) occurrence near Revelstoke, British Columbia, Canada, occurs in the Monashee Complex of the Omineca Belt of the Canadian Cordillera. Petrography of the silicate layers show that corundum formed from muscovite at the peak of metamorphism (similar to 650-700 degrees C at 8.5-9 kbar). Because the marble is almost pure calcite (dolomite is very rare), the corundum was preserved because it did not react with dolomite to spinel + calcite during decompression. The scapolite-bearing assemblages formed during or after decompression of the rock at similar to 650 degrees C and 4-6 kbar. Gem-quality corundum crystals formed especially on borders of the mica-feldspar layers in an assemblage with calcite. Whole rock geochemistry data show that the corundum-bearing silicate (mica-feldspar) layers formed by mechanical mixing of carbonate with the host gneiss protolith; the bulk composition of the silicate layers was modified by Si and Fe depletion during prograde metamorphism. High element mobility is supported by the homogenization of delta O-18 and delta C-13 values in carbonates and silicates for the marble and silicate layers. The silicate layers and the gneiss contain elevated contents of Cr and V due to the volcanoclastic component of their protolith.
dcterms:title
Origin of gem corundum in calcite marble: The Revelstoke occurrence in the Canadian Cordillera of British Columbia Origin of gem corundum in calcite marble: The Revelstoke occurrence in the Canadian Cordillera of British Columbia
skos:prefLabel
Origin of gem corundum in calcite marble: The Revelstoke occurrence in the Canadian Cordillera of British Columbia Origin of gem corundum in calcite marble: The Revelstoke occurrence in the Canadian Cordillera of British Columbia
skos:notation
RIV/00094862:_____/14:#0001661!RIV15-MK0-00094862
n3:aktivita
n18:I
n3:aktivity
I
n3:cisloPeriodika
1
n3:dodaniDat
n12:2015
n3:domaciTvurceVysledku
n5:6312578
n3:druhVysledku
n7:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
35163
n3:idVysledku
RIV/00094862:_____/14:#0001661
n3:jazykVysledku
n6:eng
n3:klicovaSlova
Corundum; Muscovite; Calcite marble; Oxygen isotopes; Geochemistry; Metamorphism
n3:klicoveSlovo
n4:Geochemistry n4:Oxygen%20isotopes n4:Metamorphism n4:Calcite%20marble n4:Muscovite n4:Corundum
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[80932DAB8F9C]
n3:nazevZdroje
Lithos
n3:obor
n11:DB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
5
n3:rokUplatneniVysledku
n12:2014
n3:svazekPeriodika
198
n3:tvurceVysledku
Cempírek, Jan Groat, Lee A. Dzikowski, Tashia J. Dipple, Gregory M. Guiliani, Gaston
n3:wos
000337851100020
s:issn
0024-4937
s:numberOfPages
17
n14:doi
10.1016/j.lithos.2014.03.030