Multiphase solid inclusions reveal the origin and fate of
carbonate-silicate melts in metasomatised peridotite

J 2021

Multiphase solid inclusions reveal the origin and fate of carbonate-silicate melts in metasomatised peridotite

KOTKOVÁ, Jana; Renata ČOPJAKOVÁ a Radek ŠKODA

Základní údaje

Originální název

Multiphase solid inclusions reveal the origin and fate of carbonate-silicate melts in metasomatised peridotite

Autoři

KOTKOVÁ, Jana (203 Česká republika, garant); Renata ČOPJAKOVÁ (203 Česká republika, domácí) a Radek ŠKODA (203 Česká republika, domácí)

Vydání

Lithos, Amsterdam, Elsevier, 2021, 0024-4937

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 4.020

Kód RIV

RIV/00216224:14310/21:00119281

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1016/j.lithos.2021.106309

UT WoS

000684298500004

EID Scopus

2-s2.0-85109494948

Klíčová slova anglicky

Multiphase solid inclusions; Garnet pyroxenite; Garnet peridotite; Carbonate-silicate melt; Mantle metasomatism; Mantle wedge

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 21. 10. 2021 10:35, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Orogenic peridotite in ultrahigh-pressure ultrahigh-temperature terranes provides increasingly strong evidence of material transfer in a subduction-zone setting, causing the metasomatism and melting of mantle rocks. Multiphase solid inclusions (MSI) trapped in garnet can provide clues to these processes occurring at great depth. The MSI enclosed in garnet in pyroxenite, lherzolite and harzburgite from a drillcore in the Saxothuringian basement in the Variscan Bohemian Massif are dominated by hornblende, barian mica and carbonate (dolomite and magnesite), and they contain a large variety of other phases, including spinel, clinopyroxene, orthopyroxene, garnet II, apatite, monazite, thorianite, graphite, norsethite and barian feldspar, scheelite and sulfides (e.g., pentlandite). We demonstrate, that the bulk chemical composition of the MSI evolves from the MSI trapped in garnet pyroxenite, which was the source of the metasomatising liquids, to the MSI in the host peridotite. Garnet pyroxenite has a carbonate-silicate composition comparable to kimberlite, and represents a rare example of a low-degree supercritical melt derived from a mixed crust-mantle source frozen in the mantle. Its high-pressure fractional crystallization produced a residual melt, enriched in alkalies (Na, K), highly incompatible elements (LILE – Ba, Sr; Th, U), LREE, Ti, W and volatiles (CO2, Cl, F, P), which is now trapped in the MSI in pyroxenite garnet. The MSI in peridotite reflect changes in the physical and chemical characteristics of the metasomatising medium during its reactive infiltration into peridotite through silicate crystallization and interaction with mantle minerals reflecting the type of rock (lherzolite vs. harzburgite). A change from a more silicic, solute-rich melt to a more diluted carbonate-rich liquid gradually enriched in LILE (K, Ba) and volatiles (CO2, Cl) and LREE fractionation with an increasing degree of fluid evolution coincides with the evolution of kimberlitic melts to carbonatitic melts. The low-viscosity carbonate-rich liquids can migrate far and metasomatise a considerable volume of the rock. Our work demonstrates that the MSI trapped in garnet represent a unique tool to trace the chemical and physical characteristics of the liquids that metasomatise the mantle wedge and their evolution.

Návaznosti

GA18-27454S, projekt VaV

Název: Přenos prvků v prostředí hluboké subdukce: doklady z ultravysokotlakých metamorfovaných terénů (Akronym: element transfer)

Investor: Grantová agentura ČR, Přenos prvků v prostředí hluboké subdukce: doklady z ultravysokotlakých metamorfovaných terénů

Citovat

KOTKOVÁ, Jana; Renata ČOPJAKOVÁ a Radek ŠKODA. Multiphase solid inclusions reveal the origin and fate of carbonate-silicate melts in metasomatised peridotite. Lithos. Amsterdam: Elsevier, 2021, roč. 398-399, October, s. 106309-106333. ISSN 0024-4937. Dostupné z: https://doi.org/10.1016/j.lithos.2021.106309.

@article{1798817,
   author = {Kotková, Jana and Čopjaková, Renata and Škoda, Radek},
   article_location = {Amsterdam},
   article_number = {October},
   doi = {https://doi.org/10.1016/j.lithos.2021.106309},
   keywords = {Multiphase solid inclusions; Garnet pyroxenite; Garnet peridotite; Carbonate-silicate melt; Mantle metasomatism; Mantle wedge},
   language = {eng},
   issn = {0024-4937},
   journal = {Lithos},
   title = {Multiphase solid inclusions reveal the origin and fate of carbonate-silicate melts in metasomatised peridotite},
   url = {https://doi.org/10.1016/j.lithos.2021.106309},
   volume = {398-399},
   year = {2021}
}

TY  - JOUR
ID  - 1798817
AU  - Kotková, Jana - Čopjaková, Renata - Škoda, Radek
PY  - 2021
TI  - Multiphase solid inclusions reveal the origin and fate of carbonate-silicate melts in metasomatised peridotite
JF  - Lithos
VL  - 398-399
IS  - October
SP  - 106309
EP  - 106309
PB  - Elsevier
SN  - 00244937
KW  - Multiphase solid inclusions
KW  - Garnet pyroxenite
KW  - Garnet peridotite
KW  - Carbonate-silicate melt
KW  - Mantle metasomatism
KW  - Mantle wedge
UR  - https://doi.org/10.1016/j.lithos.2021.106309
N2  - Orogenic peridotite in ultrahigh-pressure ultrahigh-temperature terranes provides increasingly strong evidence of material transfer in a subduction-zone setting, causing the metasomatism and melting of mantle rocks. Multiphase solid inclusions (MSI) trapped in garnet can provide clues to these processes occurring at great depth. The MSI enclosed in garnet in pyroxenite, lherzolite and harzburgite from a drillcore in the Saxothuringian basement in the Variscan Bohemian Massif are dominated by hornblende, barian mica and carbonate (dolomite and magnesite), and they contain a large variety of other phases, including spinel, clinopyroxene, orthopyroxene, garnet II, apatite, monazite, thorianite, graphite, norsethite and barian feldspar, scheelite and sulfides (e.g., pentlandite). We demonstrate, that the bulk chemical composition of the MSI evolves from the MSI trapped in garnet pyroxenite, which was the source of the metasomatising liquids, to the MSI in the host peridotite. Garnet pyroxenite has a carbonate-silicate composition comparable to kimberlite, and represents a rare example of a low-degree supercritical melt derived from a mixed crust-mantle source frozen in the mantle. Its high-pressure fractional crystallization produced a residual melt, enriched in alkalies (Na, K), highly incompatible elements (LILE – Ba, Sr; Th, U), LREE, Ti, W and volatiles (CO2, Cl, F, P), which is now trapped in the MSI in pyroxenite garnet. The MSI in peridotite reflect changes in the physical and chemical characteristics of the metasomatising medium during its reactive infiltration into peridotite through silicate crystallization and interaction with mantle minerals reflecting the type of rock (lherzolite vs. harzburgite). A change from a more silicic, solute-rich melt to a more diluted carbonate-rich liquid gradually enriched in LILE (K, Ba) and volatiles (CO2, Cl) and LREE fractionation with an increasing degree of fluid evolution coincides with the evolution of kimberlitic melts to carbonatitic melts. The low-viscosity carbonate-rich liquids can migrate far and metasomatise a considerable volume of the rock. Our work demonstrates that the MSI trapped in garnet represent a unique tool to trace the chemical and physical characteristics of the liquids that metasomatise the mantle wedge and their evolution.
ER  -

KOTKOVÁ, Jana; Renata ČOPJAKOVÁ a Radek ŠKODA. Multiphase solid inclusions reveal the origin and fate of carbonate-silicate melts in metasomatised peridotite. \textit{Lithos}. Amsterdam: Elsevier, 2021, roč.~398-399, October, s.~106309-106333. ISSN~0024-4937. Dostupné z: https://doi.org/10.1016/j.lithos.2021.106309.

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