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.

Basic information

Original name

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

Authors

ABDALE, Lindsey (guarantor), Philippe M. BELLEY, Lee A. GROAT, Jan CEMPÍREK (203 Czech Republic, belonging to the institution), Radek ŠKODA (203 Czech Republic, belonging to the institution) and Corey WALL

Edition

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

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10504 Mineralogy

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 3.500 in 2022

RIV identification code

RIV/00216224:14310/23:00130188

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.lithos.2022.106992

UT WoS

001012193500001

Keywords in English

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

Abstract

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 and 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, 438-439, February, p. 1-23. ISSN 0024-4937. Available from: https://dx.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 = {http://dx.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 and 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, 438-439, February, p.~1-23. ISSN~0024-4937. Available from: https://dx.doi.org/10.1016/j.lithos.2022.106992.

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