Mineralogy of Ti-bearing, Al-deficient tourmaline assemblages
associated with lamprophyre dikes near the O'Grady Batholith,
Northwest Territories, Canada

J 2018

Mineralogy of Ti-bearing, Al-deficient tourmaline assemblages associated with lamprophyre dikes near the O'Grady Batholith, Northwest Territories, Canada

SCRIBNER, ED, LA GROAT a Jan CEMPÍREK

Základní údaje

Originální název

Mineralogy of Ti-bearing, Al-deficient tourmaline assemblages associated with lamprophyre dikes near the O'Grady Batholith, Northwest Territories, Canada

Autoři

SCRIBNER, ED (124 Kanada), LA GROAT (124 Kanada) a Jan CEMPÍREK (203 Česká republika, garant, domácí)

Vydání

Journal of Geosciences, Praha, Česká geologická společnost, 2018, 1802-6222

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.275

Kód RIV

RIV/00216224:14310/18:00101135

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.3190/jgeosci.259

UT WoS

000439417000005

Klíčová slova anglicky

dravite; uvite; feruvite; fluor-uvite; lamprophyre dikes; O'Grady Batholith

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 23. 4. 2024 12:26, Mgr. Michal Petr

Anotace

V originále

Calc-alkaline lamprophyre dikes are hosted by tourmalinized metasedimentary rocks in the Northwest Territories, Canada. Some of these lamprophyre dikes are cross-cut by aplite and pegmatite dikes, as well as tourmaline-bearing quartz veins that were all derived from the nearby granitic O'Grady Batholith. The lamprophyre dikes are composed of actinolite to magnesio-hornblende, plagioclase, K-feldspar and quartz with minor phlogopite (up to 4.13 wt. % TiO2), titanite, apatite, pyrite, allanite-(Ce), and zircon. A zone near the margin of one of the dikes has been altered to tourmaline associated with actinolite to magnesio-hornblende, clinochlore, titanite and quartz, with minor clinopyroxene and apatite. Two generations of tourmaline are recognized: Tur I occurs in quartz at the margin of the dike and Tur II forms a massive aggregate with common inclusions of other minerals in an altered lamprophyre zone near the margin of the dike. The vast majority of the analyzed tourmaline is Al-deficient, with less than 6 apfu Al at the Z site (on average 5.691 apfu in Tur I and 5.601 apfu in Tur II). Tur I is mostly dravite with uvite, plus minor feruvite and fluor-uvite, while Tur II contains a greater proportion uvite, feruvite, and fluor-uvite. The most evolved tourmaline compositions observed are feruvite with up to 2.17 wt. % TiO2, and fluor-uvite with up to 0.84 wt. % F. The tourmaline composition reflects the unique geochemical environment in which it crystallized; from Tur I to Tur II, tourmaline becomes richer in Ca-, Fe-, and Ti, presumably due to the reaction of B-bearing fluids with the Al-poor, Ca-, Mg-Fe-, and Ti-bearing minerals in the lamprophyre dike. The high F contents of some tourmaline species suggest that it crystallized from fluids derived from the aplite and pegmatite dikes.

Návaznosti

GA17-17276S, projekt VaV

Název: Turmalín - indikátor geologických procesů

Investor: Grantová agentura ČR, Turmalín - indikátor geologických procesů

Citovat

SCRIBNER, ED, LA GROAT a Jan CEMPÍREK. Mineralogy of Ti-bearing, Al-deficient tourmaline assemblages associated with lamprophyre dikes near the O'Grady Batholith, Northwest Territories, Canada. Journal of Geosciences. Praha: Česká geologická společnost, 2018, roč. 63, č. 2, s. 123-135. ISSN 1802-6222. Dostupné z: https://dx.doi.org/10.3190/jgeosci.259.

@article{1432498,
   author = {Scribner, ED and Groat, LA and Cempírek, Jan},
   article_location = {Praha},
   article_number = {2},
   doi = {http://dx.doi.org/10.3190/jgeosci.259},
   keywords = {dravite; uvite; feruvite; fluor-uvite; lamprophyre dikes; O'Grady Batholith},
   language = {eng},
   issn = {1802-6222},
   journal = {Journal of Geosciences},
   title = {Mineralogy of Ti-bearing, Al-deficient tourmaline assemblages associated with lamprophyre dikes near the O'Grady Batholith, Northwest Territories, Canada},
   url = {http://dx.doi.org/10.3190/jgeosci.259},
   volume = {63},
   year = {2018}
}

TY  - JOUR
ID  - 1432498
AU  - Scribner, ED - Groat, LA - Cempírek, Jan
PY  - 2018
TI  - Mineralogy of Ti-bearing, Al-deficient tourmaline assemblages associated with lamprophyre dikes near the O'Grady Batholith, Northwest Territories, Canada
JF  - Journal of Geosciences
VL  - 63
IS  - 2
SP  - 123-135
EP  - 123-135
PB  - Česká geologická společnost
SN  - 18026222
KW  - dravite
KW  - uvite
KW  - feruvite
KW  - fluor-uvite
KW  - lamprophyre dikes
KW  - O'Grady Batholith
UR  - http://dx.doi.org/10.3190/jgeosci.259
N2  - Calc-alkaline lamprophyre dikes are hosted by tourmalinized metasedimentary rocks in the Northwest Territories, Canada. Some of these lamprophyre dikes are cross-cut by aplite and pegmatite dikes, as well as tourmaline-bearing quartz veins that were all derived from the nearby granitic O'Grady Batholith. The lamprophyre dikes are composed of actinolite to magnesio-hornblende, plagioclase, K-feldspar and quartz with minor phlogopite (up to 4.13 wt. % TiO2), titanite, apatite, pyrite, allanite-(Ce), and zircon. A zone near the margin of one of the dikes has been altered to tourmaline associated with actinolite to magnesio-hornblende, clinochlore, titanite and quartz, with minor clinopyroxene and apatite. Two generations of tourmaline are recognized: Tur I occurs in quartz at the margin of the dike and Tur II forms a massive aggregate with common inclusions of other minerals in an altered lamprophyre zone near the margin of the dike. The vast majority of the analyzed tourmaline is Al-deficient, with less than 6 apfu Al at the Z site (on average 5.691 apfu in Tur I and 5.601 apfu in Tur II). Tur I is mostly dravite with uvite, plus minor feruvite and fluor-uvite, while Tur II contains a greater proportion uvite, feruvite, and fluor-uvite. The most evolved tourmaline compositions observed are feruvite with up to 2.17 wt. % TiO2, and fluor-uvite with up to 0.84 wt. % F. The tourmaline composition reflects the unique geochemical environment in which it crystallized; from Tur I to Tur II, tourmaline becomes richer in Ca-, Fe-, and Ti, presumably due to the reaction of B-bearing fluids with the Al-poor, Ca-, Mg-Fe-, and Ti-bearing minerals in the lamprophyre dike. The high F contents of some tourmaline species suggest that it crystallized from fluids derived from the aplite and pegmatite dikes.
ER  -

SCRIBNER, ED, LA GROAT a Jan CEMPÍREK. Mineralogy of Ti-bearing, Al-deficient tourmaline assemblages associated with lamprophyre dikes near the O'Grady Batholith, Northwest Territories, Canada. \textit{Journal of Geosciences}. Praha: Česká geologická společnost, 2018, roč.~63, č.~2, s.~123-135. ISSN~1802-6222. Dostupné z: https://dx.doi.org/10.3190/jgeosci.259.

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