Tourmaline, an indicator of external Mg-contamination of
granitic pegmatites from host serpentinite; examples from the
Moldanubian Zone, Czech Republic

J 2017

Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic

NOVÁK, Milan, Jiří PROKOP, Zdeněk LOSOS a Ivo MACEK

Základní údaje

Originální název

Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic

Autoři

NOVÁK, Milan (203 Česká republika, domácí), Jiří PROKOP (203 Česká republika, domácí), Zdeněk LOSOS (203 Česká republika, garant, domácí) a Ivo MACEK (203 Česká republika, domácí)

Vydání

Mineralogy and Petrology, Wien, Springer Wien, 2017, 0930-0708

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Rakousko

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 1.664

Kód RIV

RIV/00216224:14310/17:00095537

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1007/s00710-017-0512-4

UT WoS

000407743900013

Klíčová slova anglicky

Tourmalines; granitic pegmatites; serpentinite; external contamination; solidus; subsolidus; Moldanubian Zone

Štítky

NZ, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 12. 4. 2018 15:50, Ing. Nicole Zrilić

Anotace

V originále

Dominant primary solidus and minor subsolidus tourmalines from a variety of granitic pegmatites enclosed in serpentinites of the Moldanubian Zone, Czech Republic were examined, mainly by electron probe micro-analyser, to reveal the degree of external Mg(Ca)-contamination from their host rocks. The rocks include: (i) homogeneous to slightly heterogeneous nests of plagioclase-tourmaline rocks (group A) of anatectic or metasomatic origin, (ii) subhomogeneous to simply zoned barren pegmatite dikes (group B), and (iii) Li-bearing zoned pegmatite dikes of rare-element class (group C). The plagioclase-tourmaline rocks (group A) show spatial relation to pegmatites of the group B. Mostly black primary tourmalines (dravite, oxy-dravite, uvite, schorl, oxy-schorl, fluor-schorl) show extensive Mg- and Ca-contamination (group A), moderate Mg- and locally minor Ca-contamination (group B plus the locality Věžná I of the group C) and weak Mg-contamination of the tourmaline solely from outermost pegmatite units (group C); tourmalines from internal units of the pegmatites are typically Mg-free. Both Mg- and Ca-contamination events were very likely contemporaneous. The extent of contamination is higher in small and texturally simple plagioclase-tourmaline rocks (group A). Larger and more highly evolved Li-bearing pegmatites (group C) with zoned internal structure show a high degree of undercooling; consequently, rapid crystallization of outer zones with biotite and/or tourmaline depleted melt in almost all Mg and isolated the pegmatite body from further external contamination during solidus crystallisation. The granitic pegmatites (group B and group C) were open to the host serpentinite during early solidus crystallization immediately after emplacement of melt and then in early and/or late subsolidus crystallization (hydrothermal stage); in plagioclase-tourmaline rocks (group A) the system was likely continuously open to host serpentinite. This study affirms tourmaline as a very useful indicator of external contamination and elevated contents of Mg in tourmaline or in other minerals are the most reliable sign of external contamination in granitic rocks.

Návaznosti

GA14-13347S, projekt VaV

Název: Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin

Investor: Grantová agentura ČR, Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin

GA17-17276S, projekt VaV

Název: Turmalín - indikátor geologických procesů

Investor: Grantová agentura ČR, Turmalín - indikátor geologických procesů

Citovat

NOVÁK, Milan, Jiří PROKOP, Zdeněk LOSOS a Ivo MACEK. Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic. Mineralogy and Petrology. Wien: Springer Wien, 2017, roč. 111, č. 4, s. 625-641. ISSN 0930-0708. Dostupné z: https://dx.doi.org/10.1007/s00710-017-0512-4.

@article{1409741,
   author = {Novák, Milan and Prokop, Jiří and Losos, Zdeněk and Macek, Ivo},
   article_location = {Wien},
   article_number = {4},
   doi = {http://dx.doi.org/10.1007/s00710-017-0512-4},
   keywords = {Tourmalines; granitic pegmatites; serpentinite; external contamination; solidus; subsolidus; Moldanubian Zone},
   language = {eng},
   issn = {0930-0708},
   journal = {Mineralogy and Petrology},
   title = {Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic},
   volume = {111},
   year = {2017}
}

TY  - JOUR
ID  - 1409741
AU  - Novák, Milan - Prokop, Jiří - Losos, Zdeněk - Macek, Ivo
PY  - 2017
TI  - Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic
JF  - Mineralogy and Petrology
VL  - 111
IS  - 4
SP  - 625-641
EP  - 625-641
PB  - Springer Wien
SN  - 09300708
KW  - Tourmalines
KW  - granitic pegmatites
KW  - serpentinite
KW  - external contamination
KW  - solidus
KW  - subsolidus
KW  - Moldanubian Zone
N2  - Dominant primary solidus and minor subsolidus tourmalines from a variety of granitic pegmatites enclosed in serpentinites of the Moldanubian Zone, Czech Republic were examined, mainly by electron probe micro-analyser, to reveal the degree of external Mg(Ca)-contamination from their host rocks. The rocks include: (i) homogeneous to slightly heterogeneous nests of plagioclase-tourmaline rocks (group A) of anatectic or metasomatic origin, (ii) subhomogeneous to simply zoned barren pegmatite dikes (group B), and (iii) Li-bearing zoned pegmatite dikes of rare-element class (group C). The plagioclase-tourmaline rocks (group A) show spatial relation to pegmatites of the group B. Mostly black primary tourmalines (dravite, oxy-dravite, uvite, schorl, oxy-schorl, fluor-schorl) show extensive Mg- and Ca-contamination (group A), moderate Mg- and locally minor Ca-contamination (group B plus the locality Věžná I of the group C) and weak Mg-contamination of the tourmaline solely from outermost pegmatite units (group C); tourmalines from internal units of the pegmatites are typically Mg-free. Both Mg- and Ca-contamination events were very likely contemporaneous. The extent of contamination is higher in small and texturally simple plagioclase-tourmaline rocks (group A). Larger and more highly evolved Li-bearing pegmatites (group C) with zoned internal structure show a high degree of undercooling; consequently, rapid crystallization of outer zones with biotite and/or tourmaline depleted melt in almost all Mg and isolated the pegmatite body from further external contamination during solidus crystallisation. The granitic pegmatites (group B and group C) were open to the host serpentinite during early solidus crystallization immediately after emplacement of melt and then in early and/or late subsolidus crystallization (hydrothermal stage); in plagioclase-tourmaline rocks (group A) the system was likely continuously open to host serpentinite. This study affirms tourmaline as a very useful indicator of external contamination and elevated contents of Mg in tourmaline or in other minerals are the most reliable sign of external contamination in granitic rocks.
ER  -

NOVÁK, Milan, Jiří PROKOP, Zdeněk LOSOS a Ivo MACEK. Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic. \textit{Mineralogy and Petrology}. Wien: Springer Wien, 2017, roč.~111, č.~4, s.~625-641. ISSN~0930-0708. Dostupné z: https://dx.doi.org/10.1007/s00710-017-0512-4.

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