Unravelling different mechanisms of metasomatism and geodynamic
evolution of pyroxenite-veined subcontinental lithospheric
mantle beneath the Central European Variscides

J 2024

Unravelling different mechanisms of metasomatism and geodynamic evolution of pyroxenite-veined subcontinental lithospheric mantle beneath the Central European Variscides

KUBEŠ, Martin; Renata ČOPJAKOVÁ; Jana KOTKOVÁ; Lukáš ACKERMAN; Jakub HAIFLER et. al.

Základní údaje

Originální název

Unravelling different mechanisms of metasomatism and geodynamic evolution of pyroxenite-veined subcontinental lithospheric mantle beneath the Central European Variscides

Autoři

KUBEŠ, Martin; Renata ČOPJAKOVÁ; Jana KOTKOVÁ; Lukáš ACKERMAN; Jakub HAIFLER ; Jakub VÝRAVSKÝ; Markéta HOLÁ; Radek ŠKODA a Jaromír LEICHMANN

Vydání

Journal of Petrology, Oxford University Press, 2024, 0022-3530

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10505 Geology

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.500

Kód RIV

RIV/00216224:14310/24:00137383

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1093/petrology/egae108

UT WoS

001347729600001

EID Scopus

2-s2.0-85208940114

Klíčová slova anglicky

lherzolite-pyroxenite association; subcontinental lithospheric mantle; mantle refertilization; chromatographic metasomatism; multiphase solid inclusions; Bohemian Massif

Štítky

14313010, 14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 19. 2. 2025 09:39, Mgr. Pavla Foltynová, Ph.D.

Anotace

V originále

Pyroxenite-veined garnet peridotites from the Gföhl Unit of the Moldanubian Zone in the Bohemian Massif provide direct constraints on diverse mechanisms of mantle metasomatism and refertilization driven by a single pulse of melt beneath the Central European Variscides. Here, we provide a detailed study on an intriguing example of this rock association where the garnet peridotites show a fertile character (high Al2O3, CaO, TiO2), corresponding to the subcontinental lithospheric mantle (SCLM). By contrast, their conspicuous LREE depletion and Sr–Nd isotopic signatures (87Sr/86Sr338 ≤ 0.7028; εNd338 ~7.3) are typical of depleted mantle residue after melt extraction. Such signatures reflect transformation of an original refractory protolith (likely harzburgite) to fertile lherzolite through percolation of primitive tholeiitic melts, parental to garnet pyroxenite in veins. The SCLM refertilization is further documented by the whole-rock positive correlation between incompatible elements (Zr, Yb, Sc, V), and trace element composition of clinopyroxene (high Ti/Eu and Ti/Nb) and garnet (elevated ∑REE, Zr, Ti). Trace element and Sr–Nd isotopic systematics of pyroxenites (87Sr/86Sr338 ~0.7025–0.7029; εNd338 ≤ 7.9) correspond to a source of melt similar to the depleted MORB mantle (DMM). Three mechanisms of metasomatism related to the interaction of this melt with the host peridotites were distinguished: (i) stealth metasomatism, reflected by extensive clinopyroxene and garnet crystallization in lherzolite adjacent to pyroxenite veins, (ii) cryptic metasomatism, recorded by lower Mg# values of orthopyroxene and olivine in lherzolite, and (iii) modal metasomatism, resulting in crystallization of amphibole and phlogopite in lherzolite close to the veins. The percolating basaltic melt was hydrous, moderately enriched in fluid-mobile elements (Cs, Rb, Ba, Pb, U, Li). Immiscible liquids, dense Ti-Mg-Fe-rich oxide melt and C-O-H fluid, trapped and crystallized as mono/multiphase solid inclusions in garnet, likely separated from a basaltic melt upon cooling. The lherzolite-pyroxenite interface reveals strong micro-scale element fractionation due to differentiation of a basaltic melt within the percolation channel. Volatile-bearing liquids that segregated from the melts migrating through wall-rock peridotites most likely caused chromatographic enrichment in highly incompatible elements (e.g. LREE) in distal peridotites relative to the LREE-depleted lherzolites adjacent to the veins. The DMM-like affinity of pyroxenites and pressure-temperature estimates for lherzolite (3.9–5.4 GPa/1010–1200 °C) and pyroxenites (2.8–4.2 GPa/860–1020 °C) point towards exhumation-driven SCLM refertilization. This was linked to decompression-induced partial melting of upwelling asthenosphere producing basaltic melts penetrating through and metasomatizing the SCLM beneath the Variscan orogenic belt in Central Europe.

Návaznosti

GA22-33820S, projekt VaV

Název: Multifázové pevné inkluze v orogenních peridotitech jako svědci metasomatózy v kolizních orogenech

Investor: Grantová agentura ČR, Multiphase solid inclusions in orogenic peridotites as tracers of metasomatism in collisional orogens

MUNI/A/1575/2023, interní kód MU

Název: Metody chemické a fyzikálně-chemické analýzy pro studium přírodních a syntetických materiálů.

Investor: Masarykova univerzita, Metody chemické a fyzikálně-chemické analýzy pro studium přírodních a syntetických materiálů.

Citovat

KUBEŠ, Martin; Renata ČOPJAKOVÁ; Jana KOTKOVÁ; Lukáš ACKERMAN; Jakub HAIFLER; Jakub VÝRAVSKÝ; Markéta HOLÁ; Radek ŠKODA a Jaromír LEICHMANN. Unravelling different mechanisms of metasomatism and geodynamic evolution of pyroxenite-veined subcontinental lithospheric mantle beneath the Central European Variscides. Journal of Petrology. Oxford University Press, 2024, roč. 65, č. 11, s. 1-35. ISSN 0022-3530. Dostupné z: https://doi.org/10.1093/petrology/egae108.

@article{2445463,
   author = {Kubeš, Martin and Čopjaková, Renata and Kotková, Jana and Ackerman, Lukáš and Haifler, Jakub and Výravský, Jakub and Holá, Markéta and Škoda, Radek and Leichmann, Jaromír},
   article_number = {11},
   doi = {https://doi.org/10.1093/petrology/egae108},
   keywords = {lherzolite-pyroxenite association; subcontinental lithospheric mantle; mantle refertilization; chromatographic metasomatism; multiphase solid inclusions; Bohemian Massif},
   language = {eng},
   issn = {0022-3530},
   journal = {Journal of Petrology},
   title = {Unravelling different mechanisms of metasomatism and geodynamic evolution of pyroxenite-veined subcontinental lithospheric mantle beneath the Central European Variscides},
   url = {https://academic.oup.com/petrology/advance-article/doi/10.1093/petrology/egae108/7823762?searchresult=1},
   volume = {65},
   year = {2024}
}

TY  - JOUR
ID  - 2445463
AU  - Kubeš, Martin - Čopjaková, Renata - Kotková, Jana - Ackerman, Lukáš - Haifler, Jakub - Výravský, Jakub - Holá, Markéta - Škoda, Radek - Leichmann, Jaromír
PY  - 2024
TI  - Unravelling different mechanisms of metasomatism and geodynamic evolution of pyroxenite-veined subcontinental lithospheric mantle beneath the Central European Variscides
JF  - Journal of Petrology
VL  - 65
IS  - 11
SP  - 1-35
EP  - 1-35
PB  - Oxford University Press
SN  - 00223530
KW  - lherzolite-pyroxenite association
KW  - subcontinental lithospheric mantle
KW  - mantle refertilization
KW  - chromatographic metasomatism
KW  - multiphase solid inclusions
KW  - Bohemian Massif
UR  - https://academic.oup.com/petrology/advance-article/doi/10.1093/petrology/egae108/7823762?searchresult=1
N2  - Pyroxenite-veined garnet peridotites from the Gföhl Unit of the Moldanubian Zone in the Bohemian Massif provide direct constraints on diverse mechanisms of mantle metasomatism and refertilization driven by a single pulse of melt beneath the Central European Variscides. Here, we provide a detailed study on an intriguing example of this rock association where the garnet peridotites show a fertile character (high Al2O3, CaO, TiO2), corresponding to the subcontinental lithospheric mantle (SCLM). By contrast, their conspicuous LREE depletion and Sr–Nd isotopic signatures (87Sr/86Sr338 ≤ 0.7028; εNd338 ~7.3) are typical of depleted mantle residue after melt extraction. Such signatures reflect transformation of an original refractory protolith (likely harzburgite) to fertile lherzolite through percolation of primitive tholeiitic melts, parental to garnet pyroxenite in veins. The SCLM refertilization is further documented by the whole-rock positive correlation between incompatible elements (Zr, Yb, Sc, V), and trace element composition of clinopyroxene (high Ti/Eu and Ti/Nb) and garnet (elevated ∑REE, Zr, Ti). Trace element and Sr–Nd isotopic systematics of pyroxenites (87Sr/86Sr338 ~0.7025–0.7029; εNd338 ≤ 7.9) correspond to a source of melt similar to the depleted MORB mantle (DMM). Three mechanisms of metasomatism related to the interaction of this melt with the host peridotites were distinguished: (i) stealth metasomatism, reflected by extensive clinopyroxene and garnet crystallization in lherzolite adjacent to pyroxenite veins, (ii) cryptic metasomatism, recorded by lower Mg# values of orthopyroxene and olivine in lherzolite, and (iii) modal metasomatism, resulting in crystallization of amphibole and phlogopite in lherzolite close to the veins. The percolating basaltic melt was hydrous, moderately enriched in fluid-mobile elements (Cs, Rb, Ba, Pb, U, Li). Immiscible liquids, dense Ti-Mg-Fe-rich oxide melt and C-O-H fluid, trapped and crystallized as mono/multiphase solid inclusions in garnet, likely separated from a basaltic melt upon cooling. The lherzolite-pyroxenite interface reveals strong micro-scale element fractionation due to differentiation of a basaltic melt within the percolation channel. Volatile-bearing liquids that segregated from the melts migrating through wall-rock peridotites most likely caused chromatographic enrichment in highly incompatible elements (e.g. LREE) in distal peridotites relative to the LREE-depleted lherzolites adjacent to the veins. The DMM-like affinity of pyroxenites and pressure-temperature estimates for lherzolite (3.9–5.4 GPa/1010–1200 °C) and pyroxenites (2.8–4.2 GPa/860–1020 °C) point towards exhumation-driven SCLM refertilization. This was linked to decompression-induced partial melting of upwelling asthenosphere producing basaltic melts penetrating through and metasomatizing the SCLM beneath the Variscan orogenic belt in Central Europe.
ER  -

KUBEŠ, Martin; Renata ČOPJAKOVÁ; Jana KOTKOVÁ; Lukáš ACKERMAN; Jakub HAIFLER; Jakub VÝRAVSKÝ; Markéta HOLÁ; Radek ŠKODA a Jaromír LEICHMANN. Unravelling different mechanisms of metasomatism and geodynamic evolution of pyroxenite-veined subcontinental lithospheric mantle beneath the Central European Variscides. \textit{Journal of Petrology}. Oxford University Press, 2024, roč.~65, č.~11, s.~1-35. ISSN~0022-3530. Dostupné z: https://doi.org/10.1093/petrology/egae108.

Přehled o publikaci