Hydrothermal alteration of tourmaline from pegmatitic rocks
enclosed in serpentinites: Multistage processes with distinct
fluid sources

J 2021

Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources

ČOPJAKOVÁ, Renata, Jiří PROKOP, Milan NOVÁK, Zdeněk LOSOS, Petr GADAS et. al.

Základní údaje

Originální název

Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources

Autoři

ČOPJAKOVÁ, Renata (203 Česká republika, garant, domácí), Jiří PROKOP (203 Česká republika, domácí), Milan NOVÁK (203 Česká republika, domácí), Zdeněk LOSOS (203 Česká republika, domácí), Petr GADAS (203 Česká republika, domácí), Radek ŠKODA (203 Česká republika, domácí) a Markéta HOLÁ (203 Česká republika, domácí)

Vydání

Lithos, Amsterdam, Elsevier, 2021, 0024-4937

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10505 Geology

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 4.020

Kód RIV

RIV/00216224:14310/21:00118781

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1016/j.lithos.2020.105823

UT WoS

000612259900003

Klíčová slova anglicky

Tourmaline; Granitic pegmatite; Tourmaline replacement; Hydrothermal alteration; Nature of fluid; Fluid mixing

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 21. 2. 2023 13:24, Mgr. Marie Šípková, DiS.

Anotace

V originále

Hydrothermal alteration of primary tourmaline (dravite, oxy-dravite, fluor-dravite,” uvite“, schorl, oxy-schorl, fluor-schorl) and associated plagioclase and quartz is examined in coarse-grained pegmatitic plagioclase-tourmaline rocks, simple granitic pegmatites and zoned beryl-columbite pegmatites, all cutting serpentinite from the Moldanubian Zone, Czech Republic. Tourmaline is replaced by a wide spectrum of minerals—prehnite, pumpellyite-(Al), K-feldspar, chlorite, muscovite, natrolite, arfvedsonite, titanite, epididymite, and hydrous Mg-silicates—and idealized replacement reactions of tourmaline are presented. Secondary mineral assemblages replacing tourmaline and chlorite geothermometry suggest evolution of the PT conditions of tourmaline alteration from T ~ 400–350 °C to 200–100 °C and P < ~1–2 kbar. The replacement processes of tourmaline proceed from the early to late subsolidus stages, and the intensity of tourmaline replacement decreases with decreasing temperature. Alteration typically occurs in small bodies of primitive plagioclase-tourmaline rocks, whereas large, more evolved and locally Li-bearing crosscutting pegmatites exhibit less pronounced tourmaline alteration. Based on the secondary mineral assemblages and types of fluids, four distinct compositional/paragenetic types are defined: Ca,Mg-, Na,K,Mg-, K,Mg- and K,Na-dominant. Sources of fluids include (i) fluids exsolved from pegmatite melt (Na, K, Ca, ± Li), particularly in the more evolved pegmatites, and (ii) fluids infiltrated/diffused from host rocks (Mg, Ca, ± Ni, Cr) at all localities; however, mixing of the fluids is obvious. Boron released from the altered tourmalines into fluids escaped from the system, and the behavior of B in aqueous fluids from granitic pegmatites is discussed. The instability of quartz and tourmaline as well as common late K-feldspar, zeolites, arfvedsonite, and minor smectite suggests alkaline conditions. The alkaline character of fluids promoted by host serpentinite was very likely the main factor affecting tourmaline replacement and the instability of plagioclase, quartz, and other minerals.

Návaznosti

GA17-17276S, projekt VaV

Název: Turmalín - indikátor geologických procesů

Investor: Grantová agentura ČR, Turmalín - indikátor geologických procesů

Citovat

ČOPJAKOVÁ, Renata, Jiří PROKOP, Milan NOVÁK, Zdeněk LOSOS, Petr GADAS, Radek ŠKODA a Markéta HOLÁ. Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources. Lithos. Amsterdam: Elsevier, 2021, roč. 380-381, January, s. "105823", 19 s. ISSN 0024-4937. Dostupné z: https://dx.doi.org/10.1016/j.lithos.2020.105823.

@article{1696317,
   author = {Čopjaková, Renata and Prokop, Jiří and Novák, Milan and Losos, Zdeněk and Gadas, Petr and Škoda, Radek and Holá, Markéta},
   article_location = {Amsterdam},
   article_number = {January},
   doi = {http://dx.doi.org/10.1016/j.lithos.2020.105823},
   keywords = {Tourmaline; Granitic pegmatite; Tourmaline replacement; Hydrothermal alteration; Nature of fluid; Fluid mixing},
   language = {eng},
   issn = {0024-4937},
   journal = {Lithos},
   title = {Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources},
   url = {https://doi.org/10.1016/j.lithos.2020.105823},
   volume = {380-381},
   year = {2021}
}

TY  - JOUR
ID  - 1696317
AU  - Čopjaková, Renata - Prokop, Jiří - Novák, Milan - Losos, Zdeněk - Gadas, Petr - Škoda, Radek - Holá, Markéta
PY  - 2021
TI  - Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources
JF  - Lithos
VL  - 380-381
IS  - January
SP  - "105823"
EP  - "105823"
PB  - Elsevier
SN  - 00244937
KW  - Tourmaline
KW  - Granitic pegmatite
KW  - Tourmaline replacement
KW  - Hydrothermal alteration
KW  - Nature of fluid
KW  - Fluid mixing
UR  - https://doi.org/10.1016/j.lithos.2020.105823
L2  - https://doi.org/10.1016/j.lithos.2020.105823
N2  - Hydrothermal alteration of primary tourmaline (dravite, oxy-dravite, fluor-dravite,” uvite“, schorl, oxy-schorl, fluor-schorl) and associated plagioclase and quartz is examined in coarse-grained pegmatitic plagioclase-tourmaline rocks, simple granitic pegmatites and zoned beryl-columbite pegmatites, all cutting serpentinite from the Moldanubian Zone, Czech Republic. Tourmaline is replaced by a wide spectrum of minerals—prehnite, pumpellyite-(Al), K-feldspar, chlorite, muscovite, natrolite, arfvedsonite, titanite, epididymite, and hydrous Mg-silicates—and idealized replacement reactions of tourmaline are presented. Secondary mineral assemblages replacing tourmaline and chlorite geothermometry suggest evolution of the PT conditions of tourmaline alteration from T ~ 400–350 °C to 200–100 °C and P < ~1–2 kbar. The replacement processes of tourmaline proceed from the early to late subsolidus stages, and the intensity of tourmaline replacement decreases with decreasing temperature. Alteration typically occurs in small bodies of primitive plagioclase-tourmaline rocks, whereas large, more evolved and locally Li-bearing crosscutting pegmatites exhibit less pronounced tourmaline alteration. Based on the secondary mineral assemblages and types of fluids, four distinct compositional/paragenetic types are defined: Ca,Mg-, Na,K,Mg-, K,Mg- and K,Na-dominant. Sources of fluids include (i) fluids exsolved from pegmatite melt (Na, K, Ca, ± Li), particularly in the more evolved pegmatites, and (ii) fluids infiltrated/diffused from host rocks (Mg, Ca, ± Ni, Cr) at all localities; however, mixing of the fluids is obvious. Boron released from the altered tourmalines into fluids escaped from the system, and the behavior of B in aqueous fluids from granitic pegmatites is discussed. The instability of quartz and tourmaline as well as common late K-feldspar, zeolites, arfvedsonite, and minor smectite suggests alkaline conditions. The alkaline character of fluids promoted by host serpentinite was very likely the main factor affecting tourmaline replacement and the instability of plagioclase, quartz, and other minerals.
ER  -

ČOPJAKOVÁ, Renata, Jiří PROKOP, Milan NOVÁK, Zdeněk LOSOS, Petr GADAS, Radek ŠKODA a Markéta HOLÁ. Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources. \textit{Lithos}. Amsterdam: Elsevier, 2021, roč.~380-381, January, s.~''105823'', 19 s. ISSN~0024-4937. Dostupné z: https://dx.doi.org/10.1016/j.lithos.2020.105823.

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