Corundum genesis at the Blue Jay Sapphire occurrence (British
Columbia, Canada) as a record of metamorphism and partial
melting in the Monashee Complex

J 2023

Corundum genesis at the Blue Jay Sapphire occurrence (British Columbia, Canada) as a record of metamorphism and partial melting in the Monashee Complex

ABDALE, Lindsey; Philippe M. BELLEY; Lee A. GROAT; Jan CEMPÍREK; Radek ŠKODA et. al.

Základní údaje

Originální název

Corundum genesis at the Blue Jay Sapphire occurrence (British Columbia, Canada) as a record of metamorphism and partial melting in the Monashee Complex

Autoři

ABDALE, Lindsey (garant); Philippe M. BELLEY; Lee A. GROAT; Jan CEMPÍREK (203 Česká republika, domácí); Radek ŠKODA (203 Česká republika, domácí) a Corey WALL

Vydání

Lithos, Elsevier B.V. 2023, 0024-4937

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 2.900

Kód RIV

RIV/00216224:14310/23:00130188

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1016/j.lithos.2022.106992

UT WoS

001012193500001

EID Scopus

2-s2.0-85146132001

Klíčová slova anglicky

Corundum; Muscovite; Leucosome; Metamorphic core complex; Partial melting; Metamorphism

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 9. 8. 2023 11:37, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

The sapphire (corundum) occurrence near Revelstoke, British Columbia, Canada, occurs in the Monashee Complex of the Omineca Belt of the Canadian Cordillera. Corundum occurs in boudins or pod-like zones of restite within a garnet-bearing leucosome. Both zones are peraluminous and contain plagioclase, K-feldspar, and biotite and muscovite as the dominant mineral phases. Relative to the leucosome, the corundum-pods are slightly depleted in SiO2 (55.28 wt% in corundum-pods vs. 62.7 wt% in leucosome) and K2O (4.74/7.05 wt%) and enriched in Al2O3 (22.57/21.97 wt%), Fe2O3 (5.96/2.11 wt%), TiO2 (0.71/0.21 wt%), CaO (0.68/0.60 wt%), and MgO (0.59/0.28 wt%). The peraluminous nature of the corundum-bearing pods is consistent with partial melting of a metapelitic protolith. Similar chemical compositions between the corundum-pods and garnet-leucosome are interpreted to infer a single, in situ partial melting event. Coinciding melt-compatible and incompatible elements suggest a closed system. Igneous textures in thin section (coarse-grained, euhedral corundum; twinning in plagioclase; small cuspate-shaped biotite, and myrmekitic intergrowths of feldspars) confirm a partial melt origin. Petrography and thermodynamic models reveal that corundum growth and partial melting was fueled by the breakdown of muscovite along the prograde P-T path. Whole-rock geochemistry of the leucosome groundmass devoid of garnet shows high Sr/Y and La/Yb ratios indicative of garnet fractionation, and garnet mineral chemistry are Ca-poor indicating garnets crystallized from the peraluminous partial melts at peak P-T conditions. 206Pb/238U ages of garnet-equilibrated zircon indicate that peak metamorphic conditions occurred at or before ∼60.69 Ma. Continued zircon growth until 50.22 Ma tracks the presence of continued partial melt following peak metamorphism during nearly-isothermal decompression. A resulting P-T-t path for basement rocks form the Thor-Odin dome constrains the timing of peak metamorphism and ensuing partial melting events during Cordilleran orogenesis.

Citovat

ABDALE, Lindsey; Philippe M. BELLEY; Lee A. GROAT; Jan CEMPÍREK; Radek ŠKODA a Corey WALL. Corundum genesis at the Blue Jay Sapphire occurrence (British Columbia, Canada) as a record of metamorphism and partial melting in the Monashee Complex. Lithos. Elsevier B.V., 2023, roč. 438-439, February, s. 1-23. ISSN 0024-4937. Dostupné z: https://doi.org/10.1016/j.lithos.2022.106992.

@article{2247305,
   author = {Abdale, Lindsey and Belley, Philippe M. and Groat, Lee A. and Cempírek, Jan and Škoda, Radek and Wall, Corey},
   article_number = {February},
   doi = {https://doi.org/10.1016/j.lithos.2022.106992},
   keywords = {Corundum; Muscovite; Leucosome; Metamorphic core complex; Partial melting; Metamorphism},
   language = {eng},
   issn = {0024-4937},
   journal = {Lithos},
   title = {Corundum genesis at the Blue Jay Sapphire occurrence (British Columbia, Canada) as a record of metamorphism and partial melting in the Monashee Complex},
   url = {https://doi.org/10.1016/j.lithos.2022.106992},
   volume = {438-439},
   year = {2023}
}

TY  - JOUR
ID  - 2247305
AU  - Abdale, Lindsey - Belley, Philippe M. - Groat, Lee A. - Cempírek, Jan - Škoda, Radek - Wall, Corey
PY  - 2023
TI  - Corundum genesis at the Blue Jay Sapphire occurrence (British Columbia, Canada) as a record of metamorphism and partial melting in the Monashee Complex
JF  - Lithos
VL  - 438-439
IS  - February
SP  - 1-23
EP  - 1-23
PB  - Elsevier B.V.
SN  - 00244937
KW  - Corundum
KW  - Muscovite
KW  - Leucosome
KW  - Metamorphic core complex
KW  - Partial melting
KW  - Metamorphism
UR  - https://doi.org/10.1016/j.lithos.2022.106992
N2  - The sapphire (corundum) occurrence near Revelstoke, British Columbia, Canada, occurs in the Monashee Complex of the Omineca Belt of the Canadian Cordillera. Corundum occurs in boudins or pod-like zones of restite within a garnet-bearing leucosome. Both zones are peraluminous and contain plagioclase, K-feldspar, and biotite and muscovite as the dominant mineral phases. Relative to the leucosome, the corundum-pods are slightly depleted in SiO2 (55.28 wt% in corundum-pods vs. 62.7 wt% in leucosome) and K2O (4.74/7.05 wt%) and enriched in Al2O3 (22.57/21.97 wt%), Fe2O3 (5.96/2.11 wt%), TiO2 (0.71/0.21 wt%), CaO (0.68/0.60 wt%), and MgO (0.59/0.28 wt%). The peraluminous nature of the corundum-bearing pods is consistent with partial melting of a metapelitic protolith. Similar chemical compositions between the corundum-pods and garnet-leucosome are interpreted to infer a single, in situ partial melting event. Coinciding melt-compatible and incompatible elements suggest a closed system. Igneous textures in thin section (coarse-grained, euhedral corundum; twinning in plagioclase; small cuspate-shaped biotite, and myrmekitic intergrowths of feldspars) confirm a partial melt origin. Petrography and thermodynamic models reveal that corundum growth and partial melting was fueled by the breakdown of muscovite along the prograde P-T path. Whole-rock geochemistry of the leucosome groundmass devoid of garnet shows high Sr/Y and La/Yb ratios indicative of garnet fractionation, and garnet mineral chemistry are Ca-poor indicating garnets crystallized from the peraluminous partial melts at peak P-T conditions. 206Pb/238U ages of garnet-equilibrated zircon indicate that peak metamorphic conditions occurred at or before ∼60.69 Ma. Continued zircon growth until 50.22 Ma tracks the presence of continued partial melt following peak metamorphism during nearly-isothermal decompression. A resulting P-T-t path for basement rocks form the Thor-Odin dome constrains the timing of peak metamorphism and ensuing partial melting events during Cordilleran orogenesis.
ER  -

ABDALE, Lindsey; Philippe M. BELLEY; Lee A. GROAT; Jan CEMPÍREK; Radek ŠKODA a Corey WALL. Corundum genesis at the Blue Jay Sapphire occurrence (British Columbia, Canada) as a record of metamorphism and partial melting in the Monashee Complex. \textit{Lithos}. Elsevier B.V., 2023, roč.~438-439, February, s.~1-23. ISSN~0024-4937. Dostupné z: https://doi.org/10.1016/j.lithos.2022.106992.

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