Crystallisation of trapped carbonate-silicate melts terminating
at the carbonated solidus ledge: a record of carbon
immobilisation mechanism in the lithospheric mantle

J 2024

Crystallisation of trapped carbonate-silicate melts terminating at the carbonated solidus ledge: a record of carbon immobilisation mechanism in the lithospheric mantle

HAIFLER, Jakub, Jana KOTKOVÁ a Renata ČOPJAKOVÁ

Základní údaje

Originální název

Crystallisation of trapped carbonate-silicate melts terminating at the carbonated solidus ledge: a record of carbon immobilisation mechanism in the lithospheric mantle

Autoři

HAIFLER, Jakub, Jana KOTKOVÁ a Renata ČOPJAKOVÁ

Vydání

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, NEW YORK, SPRINGER, 2024, 0010-7999

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.500 v roce 2022

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1007/s00410-024-02108-1

UT WoS

001187646000001

Klíčová slova anglicky

Orogenic garnet peridotites; Bohemian Massif; Multiphase solid inclusions; Carbonated peridotite solidus; Pseudosection; Mantle melt

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 5. 6. 2024 13:12, Mgr. Jakub Haifler, Ph.D.

Anotace

V originále

Orogenic peridotites in the crystalline basement of the northwestern Bohemian Massif contain multiphase solid inclusions (MSI), which are interpreted to be crystallisation products of trapped former carbonate-silicate melts metasomatizing their host rocks. We applied conventional thermobarometry and forward thermodynamic modelling to constrain the P-T evolution ranging from the peak metamorphic conditions of the investigated harzburgite and lherzolite, through entrapment of the melts in the outer parts of garnets, to the (re)-equilibration of the MSI assemblages. The peak conditions of c. 1100 degrees C/4.5-5.5 GPa are recorded by garnet cores and large pyroxene porphyroclasts. The melt entrapment, during which garnet outer parts grew, was associated with influx of the metasomatizing liquids and probably took place during the early stage of the exhumation. Thermodynamic model of amphibole-free MSI assemblage comprising kinoshitalite/Ba-rich phlogopite (approximated by phlogopite in the model), dolomite, magnesite, clinopyroxene, orthopyroxene, garnet and chromite provided robust estimate of P and T of its (re)-equilibration, c. 900-1000 degrees C, 1.8-2.2 GPa. Furthermore, the lack of olivine reflects co-existence of COH fluid with high X(CO2) = CO2/(CO2 + H2O) >= 0.6. Models employing identical P-T-X(CO2) parameters successfully reproduced the other two amphibole-bearing assemblages observed. The modelled stability fields show perfect alignment with a characteristic isobaric segment of the solidus curve of carbonated peridotite. This co-incidence implies that the (re)-equilibration corresponds to the termination of the melt crystallisation once the near-isothermal exhumation path intersected the solidus. Decreased solubility of silicates at the carbonated peridotite "solidus ledge", inferred from the published experimental data, as well as concentric textures of some MSI indicates sequential crystallisation from the early silicates to late dolomite. The carbonated "solidus ledge" is a relatively narrow boundary in the lithospheric mantle capable of an abrupt immobilisation of fluxing or transported carbonated melts. The investigated rocks are estimated to store approximately 0.02 kg C/m3 (or 6 ppm C) occurring as carbonates in the MSI.

Citovat

HAIFLER, Jakub, Jana KOTKOVÁ a Renata ČOPJAKOVÁ. Crystallisation of trapped carbonate-silicate melts terminating at the carbonated solidus ledge: a record of carbon immobilisation mechanism in the lithospheric mantle. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY. NEW YORK: SPRINGER, 2024, roč. 179, č. 4, 27 s. ISSN 0010-7999. Dostupné z: https://dx.doi.org/10.1007/s00410-024-02108-1.

@article{2407959,
   author = {Haifler, Jakub and Kotková, Jana and Čopjaková, Renata},
   article_location = {NEW YORK},
   article_number = {4},
   doi = {http://dx.doi.org/10.1007/s00410-024-02108-1},
   keywords = {Orogenic garnet peridotites; Bohemian Massif; Multiphase solid inclusions; Carbonated peridotite solidus; Pseudosection; Mantle melt},
   language = {eng},
   issn = {0010-7999},
   journal = {CONTRIBUTIONS TO MINERALOGY AND PETROLOGY},
   title = {Crystallisation of trapped carbonate-silicate melts terminating at the carbonated solidus ledge: a record of carbon immobilisation mechanism in the lithospheric mantle},
   url = {https://link.springer.com/article/10.1007/s00410-024-02108-1},
   volume = {179},
   year = {2024}
}

TY  - JOUR
ID  - 2407959
AU  - Haifler, Jakub - Kotková, Jana - Čopjaková, Renata
PY  - 2024
TI  - Crystallisation of trapped carbonate-silicate melts terminating at the carbonated solidus ledge: a record of carbon immobilisation mechanism in the lithospheric mantle
JF  - CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
VL  - 179
IS  - 4
PB  - SPRINGER
SN  - 00107999
KW  - Orogenic garnet peridotites
KW  - Bohemian Massif
KW  - Multiphase solid inclusions
KW  - Carbonated peridotite solidus
KW  - Pseudosection
KW  - Mantle melt
UR  - https://link.springer.com/article/10.1007/s00410-024-02108-1
N2  - Orogenic peridotites in the crystalline basement of the northwestern Bohemian Massif contain multiphase solid inclusions (MSI), which are interpreted to be crystallisation products of trapped former carbonate-silicate melts metasomatizing their host rocks. We applied conventional thermobarometry and forward thermodynamic modelling to constrain the P-T evolution ranging from the peak metamorphic conditions of the investigated harzburgite and lherzolite, through entrapment of the melts in the outer parts of garnets, to the (re)-equilibration of the MSI assemblages. The peak conditions of c. 1100 degrees C/4.5-5.5 GPa are recorded by garnet cores and large pyroxene porphyroclasts. The melt entrapment, during which garnet outer parts grew, was associated with influx of the metasomatizing liquids and probably took place during the early stage of the exhumation. Thermodynamic model of amphibole-free MSI assemblage comprising kinoshitalite/Ba-rich phlogopite (approximated by phlogopite in the model), dolomite, magnesite, clinopyroxene, orthopyroxene, garnet and chromite provided robust estimate of P and T of its (re)-equilibration, c. 900-1000 degrees C, 1.8-2.2 GPa. Furthermore, the lack of olivine reflects co-existence of COH fluid with high X(CO2) = CO2/(CO2 + H2O) >= 0.6. Models employing identical P-T-X(CO2) parameters successfully reproduced the other two amphibole-bearing assemblages observed. The modelled stability fields show perfect alignment with a characteristic isobaric segment of the solidus curve of carbonated peridotite. This co-incidence implies that the (re)-equilibration corresponds to the termination of the melt crystallisation once the near-isothermal exhumation path intersected the solidus. Decreased solubility of silicates at the carbonated peridotite "solidus ledge", inferred from the published experimental data, as well as concentric textures of some MSI indicates sequential crystallisation from the early silicates to late dolomite. The carbonated "solidus ledge" is a relatively narrow boundary in the lithospheric mantle capable of an abrupt immobilisation of fluxing or transported carbonated melts. The investigated rocks are estimated to store approximately 0.02 kg C/m3 (or 6 ppm C) occurring as carbonates in the MSI.
ER  -

HAIFLER, Jakub, Jana KOTKOVÁ a Renata ČOPJAKOVÁ. Crystallisation of trapped carbonate-silicate melts terminating at the carbonated solidus ledge: a record of carbon immobilisation mechanism in the lithospheric mantle. \textit{CONTRIBUTIONS TO MINERALOGY AND PETROLOGY}. NEW YORK: SPRINGER, 2024, roč.~179, č.~4, 27 s. ISSN~0010-7999. Dostupné z: https://dx.doi.org/10.1007/s00410-024-02108-1.

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