Origin of scapolite-hosted sapphire (corundum) near Kimmirut,
Baffin Island, Nunavut, Canada

J 2017

Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin Island, Nunavut, Canada

BELLEY, P.M., T.J. DZIKOWSKI, A. FAGAN, Jan CEMPÍREK, L.A. GROAT et. al.

Základní údaje

Originální název

Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin Island, Nunavut, Canada

Autoři

BELLEY, P.M. (124 Kanada), T.J. DZIKOWSKI (124 Kanada), A. FAGAN (124 Kanada), Jan CEMPÍREK (203 Česká republika, domácí), L.A. GROAT (124 Kanada), J.K. MORTENSEN (124 Kanada), M. FAYEK (124 Kanada), G. GIULIANI (250 Francie), A.E. FALLICK (826 Velká Británie a Severní Irsko) a P. GERTZBEIN (124 Kanada)

Vydání

Canadian Mineralogist, QUEBEC, MINERALOGICAL ASSOC CANADA, 2017, 0008-4476

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Kanada

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 0.945

Kód RIV

RIV/00216224:14310/17:00095032

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.3749/canmin.1700018

UT WoS

000406369600008

Klíčová slova anglicky

sapphire; corundum; marble; calc-silicate rock; scapolite; gem deposits; metamarl; nepheline; proterozoic

Štítky

NZ, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 10. 4. 2018 12:05, Ing. Nicole Zrilić

Anotace

V originále

Gem-quality corundum (sapphire) occurs in scapolite-rich calc-silicate rock hosted in marble of the Lake Harbour Group near Kimmirut, southern Baffin Island. A deposit of blue and colorless gem corundum (Beluga occurrence) is compared to a similar calc-silicate pod generally lacking corundum but containing nepheline (Bowhead occurrence) and located 170 m to the SSW. Corundum formation was made possible by three equally important sequential metamorphic reactions: (1) formation of nepheline, diopside, and K-feldspar (inferred) at granulite facies peak metamorphic conditions; (2) partial retrograde replacement of the peak assemblage by phlogopite, oligoclase, calcite, and scapolite (Me-50-Me-67) as a result of CO2-, H2O-, Cl-, F-bearing fluid influx at 1782.5 +/- 3.7 Ma (P-T 720 degrees C, 6.2 kbar); and (3) retrograde breakdown of scapolite + nepheline (with CO2-and H2O-bearing fluid) to form albite, muscovite, corundum, and calcite. Late, low-temperature zeolite mineralization is common in corundum-bearing zones. Based on thermodynamic models, the corundum-forming reaction only occurs in a 100 degrees C window with an upper limit determined by scapolite-nepheline stability, and a lower limit determined by the formation of Al-silicate rather than corundum. The protolith is inferred to be dolomitic argillaceous marl with no evidence to suggest the initial presence of evaporites. The enrichment of trace metals V and Cr, and the depletion of Co, Ni, and Mn, suggest reducing diagenetic conditions in the initial sediment. Beluga calc-silicate rock is strongly depleted in REE. Oxy-dravite delta B-11 (+3.9 +/- 0.7%) is consistent with a marine boron source. The oxygen isotope composition of corundum (delta O-18(VSMOW) = 16.4 +/- 0.1%) is comparable to that of corundum in marble or desilicated pegmatite associated with marble.

Návaznosti

GA17-17276S, projekt VaV

Název: Turmalín - indikátor geologických procesů

Investor: Grantová agentura ČR, Turmalín - indikátor geologických procesů

Citovat

BELLEY, P.M., T.J. DZIKOWSKI, A. FAGAN, Jan CEMPÍREK, L.A. GROAT, J.K. MORTENSEN, M. FAYEK, G. GIULIANI, A.E. FALLICK a P. GERTZBEIN. Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin Island, Nunavut, Canada. Canadian Mineralogist. QUEBEC: MINERALOGICAL ASSOC CANADA, 2017, roč. 55, č. 4, s. 669-699. ISSN 0008-4476. Dostupné z: https://dx.doi.org/10.3749/canmin.1700018.

@article{1391542,
   author = {Belley, P.M. and Dzikowski, T.J. and Fagan, A. and Cempírek, Jan and Groat, L.A. and Mortensen, J.K. and Fayek, M. and Giuliani, G. and Fallick, A.E. and Gertzbein, P.},
   article_location = {QUEBEC},
   article_number = {4},
   doi = {http://dx.doi.org/10.3749/canmin.1700018},
   keywords = {sapphire; corundum; marble; calc-silicate rock; scapolite; gem deposits; metamarl; nepheline; proterozoic},
   language = {eng},
   issn = {0008-4476},
   journal = {Canadian Mineralogist},
   title = {Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin Island, Nunavut, Canada},
   volume = {55},
   year = {2017}
}

TY  - JOUR
ID  - 1391542
AU  - Belley, P.M. - Dzikowski, T.J. - Fagan, A. - Cempírek, Jan - Groat, L.A. - Mortensen, J.K. - Fayek, M. - Giuliani, G. - Fallick, A.E. - Gertzbein, P.
PY  - 2017
TI  - Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin Island, Nunavut, Canada
JF  - Canadian Mineralogist
VL  - 55
IS  - 4
SP  - 669-699
EP  - 669-699
PB  - MINERALOGICAL ASSOC CANADA
SN  - 00084476
KW  - sapphire
KW  - corundum
KW  - marble
KW  - calc-silicate rock
KW  - scapolite
KW  - gem deposits
KW  - metamarl
KW  - nepheline
KW  - proterozoic
N2  - Gem-quality corundum (sapphire) occurs in scapolite-rich calc-silicate rock hosted in marble of the Lake Harbour Group near Kimmirut, southern Baffin Island. A deposit of blue and colorless gem corundum (Beluga occurrence) is compared to a similar calc-silicate pod generally lacking corundum but containing nepheline (Bowhead occurrence) and located 170 m to the SSW. Corundum formation was made possible by three equally important sequential metamorphic reactions: (1) formation of nepheline, diopside, and K-feldspar (inferred) at granulite facies peak metamorphic conditions; (2) partial retrograde replacement of the peak assemblage by phlogopite, oligoclase, calcite, and scapolite (Me-50-Me-67) as a result of CO2-, H2O-, Cl-, F-bearing fluid influx at 1782.5 +/- 3.7 Ma (P-T 720 degrees C, 6.2 kbar); and (3) retrograde breakdown of scapolite + nepheline (with CO2-and H2O-bearing fluid) to form albite, muscovite, corundum, and calcite. Late, low-temperature zeolite mineralization is common in corundum-bearing zones. Based on thermodynamic models, the corundum-forming reaction only occurs in a 100 degrees C window with an upper limit determined by scapolite-nepheline stability, and a lower limit determined by the formation of Al-silicate rather than corundum. The protolith is inferred to be dolomitic argillaceous marl with no evidence to suggest the initial presence of evaporites. The enrichment of trace metals V and Cr, and the depletion of Co, Ni, and Mn, suggest reducing diagenetic conditions in the initial sediment. Beluga calc-silicate rock is strongly depleted in REE. Oxy-dravite delta B-11 (+3.9 +/- 0.7%) is consistent with a marine boron source. The oxygen isotope composition of corundum (delta O-18(VSMOW) = 16.4 +/- 0.1%) is comparable to that of corundum in marble or desilicated pegmatite associated with marble.
ER  -

BELLEY, P.M., T.J. DZIKOWSKI, A. FAGAN, Jan CEMPÍREK, L.A. GROAT, J.K. MORTENSEN, M. FAYEK, G. GIULIANI, A.E. FALLICK a P. GERTZBEIN. Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin Island, Nunavut, Canada. \textit{Canadian Mineralogist}. QUEBEC: MINERALOGICAL ASSOC CANADA, 2017, roč.~55, č.~4, s.~669-699. ISSN~0008-4476. Dostupné z: https://dx.doi.org/10.3749/canmin.1700018.

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