Petrogenesis and Lu–Hf dating of (ultra)mafic rocks from the
Kutná Hora Crystalline Complex: implications for the Devonian
evolution of the Bohemian Massif

J 2020

Petrogenesis and Lu–Hf dating of (ultra)mafic rocks from the Kutná Hora Crystalline Complex: implications for the Devonian evolution of the Bohemian Massif

ACKERMAN, Lukáš, Jana KOTKOVÁ, Renata ČOPJAKOVÁ, Jiří SLÁMA, Jakub TRUBAČ et. al.

Basic information

Original name

Petrogenesis and Lu–Hf dating of (ultra)mafic rocks from the Kutná Hora Crystalline Complex: implications for the Devonian evolution of the Bohemian Massif

Authors

ACKERMAN, Lukáš (guarantor), Jana KOTKOVÁ, Renata ČOPJAKOVÁ (203 Czech Republic, belonging to the institution), Jiří SLÁMA, Jakub TRUBAČ and Veronika DILLINGEROVÁ (703 Slovakia, belonging to the institution)

Edition

Journal of Petrology, Oxford, Oxford University Press, 2020, 0022-3530

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10505 Geology

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 4.515

RIV identification code

RIV/00216224:14310/20:00114487

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1093/petrology/egaa075

UT WoS

000606291600002

Keywords in English

peridotite; eclogite; Lu–Hf dating; multiphase solid inclusions; Bohemian Massif

Abstract

V originále

The Lu-Hf isotope system and Sr-Nd-Hf-Os isotope systematics of mantle rocks are capable of unravelling the early processes in collision belts, especially in a hot subduction context where the Sm-Nd and U-Pb systems in crustal rocks are prone to resetting owing to high temperatures and interaction with melts during exhumation. To improve models of the Devonian-Carboniferous evolution of the Bohemian Massif, we investigated in detail mafic and ultramafic rocks (eclogite, pyroxenite, and peridotite) from the ultrahigh-pressure and ultrahigh-temperature Kutna Hora Crystalline Complex (KHCC: Uhrov, Becvary, Doubrava, and Spaeice localities). Petrography, multiphase solid inclusions, major and trace element compositions of rocks and minerals, and radiogenic isotopic data document contrasting sources and protoliths as well as effects of subduction-related processes for these rocks. The Uhrov peridotite has a depleted composition corresponding to the suboceanic asthenospheric mantle, whereas Beevary and Doubrava peridotites represent lithospheric mantle that underwent melt refertilization by basaltic and SiO2-undersaturated melts, respectively. Multiphase solid inclusions enclosed in garnet from Uhrov and Beevary peridotites represent trapped H2O +/- CO2-bearing metasomatizing agents and Fe-Ti-rich melts. The KHCC eclogites either formed by high-pressure crystal accumulation from mantle-derived basaltic melts (Uhrov) or represent a fragment of mid-ocean ridge basalt-like gabbroic cumulate (Spaeice) and crustalderived material (Doubrava) both metamorphosed at high P-T conditions. The Lu-Hf age of 395 +/- 23 Ma obtained for the Uhrov peridotite reflects garnet growth related to burial of the asthenospheric mantle during subduction of the oceanic slab. By contrast, Spaeice and Doubrava eclogites yield younger Lu-Hf ages of similar to 350 and 330 Ma, respectively, representing mixed ages as demonstrated by the strong granulite-facies overprint and trace element zoning in garnet grains. We propose a refined model for the Early Variscan evolution of the Bohemian Massif starting with the subduction of the oceanic crust (Saxothuringian ocean) and associated oceanic asthenospheric mantle (Uhrov) beneath the Tepla-Barrandian at >= 380 Ma, which was responsible for melt refertilization of the associated mantle wedge (Beevary, Doubrava). This was followed by continental subduction (similar to 370-360 Ma?) accompanied by the oceanic slab break-off and incorporation of the upwelling asthenospheric mantle into the Moldanubian lithospheric mantle and subsequent coeval exhumation of mantle and crustal rocks at similar to 350-330 Ma.

Links

GA18-27454S, research and development project

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

Investor: Czech Science Foundation, Element transfer in deep subduction environment: constraints from ultrahigh-presssure metamorphic terranes

MUNI/A/1375/2018, interní kód MU

Name: Výzkum a vývoj v analytické a fyzikální chemii

Investor: Masaryk University, Category A

Citovat

ACKERMAN, Lukáš, Jana KOTKOVÁ, Renata ČOPJAKOVÁ, Jiří SLÁMA, Jakub TRUBAČ and Veronika DILLINGEROVÁ. Petrogenesis and Lu–Hf dating of (ultra)mafic rocks from the Kutná Hora Crystalline Complex: implications for the Devonian evolution of the Bohemian Massif. Journal of Petrology. Oxford: Oxford University Press, 2020, vol. 61, No 8, p. "egaa075", 31 pp. ISSN 0022-3530. Available from: https://dx.doi.org/10.1093/petrology/egaa075.

@article{1696338,
   author = {Ackerman, Lukáš and Kotková, Jana and Čopjaková, Renata and Sláma, Jiří and Trubač, Jakub and Dillingerová, Veronika},
   article_location = {Oxford},
   article_number = {8},
   doi = {http://dx.doi.org/10.1093/petrology/egaa075},
   keywords = {peridotite; eclogite; Lu–Hf dating; multiphase solid inclusions; Bohemian Massif},
   language = {eng},
   issn = {0022-3530},
   journal = {Journal of Petrology},
   title = {Petrogenesis and Lu–Hf dating of (ultra)mafic rocks from the Kutná Hora Crystalline Complex: implications for the Devonian evolution of the Bohemian Massif},
   url = {https://doi.org/10.1093/petrology/egaa075},
   volume = {61},
   year = {2020}
}

TY  - JOUR
ID  - 1696338
AU  - Ackerman, Lukáš - Kotková, Jana - Čopjaková, Renata - Sláma, Jiří - Trubač, Jakub - Dillingerová, Veronika
PY  - 2020
TI  - Petrogenesis and Lu–Hf dating of (ultra)mafic rocks from the Kutná Hora Crystalline Complex: implications for the Devonian evolution of the Bohemian Massif
JF  - Journal of Petrology
VL  - 61
IS  - 8
SP  - "egaa075"
EP  - "egaa075"
PB  - Oxford University Press
SN  - 00223530
KW  - peridotite
KW  - eclogite
KW  - Lu–Hf dating
KW  - multiphase solid inclusions
KW  - Bohemian Massif
UR  - https://doi.org/10.1093/petrology/egaa075
L2  - https://doi.org/10.1093/petrology/egaa075
N2  - The Lu-Hf isotope system and Sr-Nd-Hf-Os isotope systematics of mantle rocks are capable of unravelling the early processes in collision belts, especially in a hot subduction context where the Sm-Nd and U-Pb systems in crustal rocks are prone to resetting owing to high temperatures and interaction with melts during exhumation. To improve models of the Devonian-Carboniferous evolution of the Bohemian Massif, we investigated in detail mafic and ultramafic rocks (eclogite, pyroxenite, and peridotite) from the ultrahigh-pressure and ultrahigh-temperature Kutna Hora Crystalline Complex (KHCC: Uhrov, Becvary, Doubrava, and Spaeice localities). Petrography, multiphase solid inclusions, major and trace element compositions of rocks and minerals, and radiogenic isotopic data document contrasting sources and protoliths as well as effects of subduction-related processes for these rocks. The Uhrov peridotite has a depleted composition corresponding to the suboceanic asthenospheric mantle, whereas Beevary and Doubrava peridotites represent lithospheric mantle that underwent melt refertilization by basaltic and SiO2-undersaturated melts, respectively. Multiphase solid inclusions enclosed in garnet from Uhrov and Beevary peridotites represent trapped H2O +/- CO2-bearing metasomatizing agents and Fe-Ti-rich melts. The KHCC eclogites either formed by high-pressure crystal accumulation from mantle-derived basaltic melts (Uhrov) or represent a fragment of mid-ocean ridge basalt-like gabbroic cumulate (Spaeice) and crustalderived material (Doubrava) both metamorphosed at high P-T conditions. The Lu-Hf age of 395 +/- 23 Ma obtained for the Uhrov peridotite reflects garnet growth related to burial of the asthenospheric mantle during subduction of the oceanic slab. By contrast, Spaeice and Doubrava eclogites yield younger Lu-Hf ages of similar to 350 and 330 Ma, respectively, representing mixed ages as demonstrated by the strong granulite-facies overprint and trace element zoning in garnet grains. We propose a refined model for the Early Variscan evolution of the Bohemian Massif starting with the subduction of the oceanic crust (Saxothuringian ocean) and associated oceanic asthenospheric mantle (Uhrov) beneath the Tepla-Barrandian at >= 380 Ma, which was responsible for melt refertilization of the associated mantle wedge (Beevary, Doubrava). This was followed by continental subduction (similar to 370-360 Ma?) accompanied by the oceanic slab break-off and incorporation of the upwelling asthenospheric mantle into the Moldanubian lithospheric mantle and subsequent coeval exhumation of mantle and crustal rocks at similar to 350-330 Ma.
ER  -

ACKERMAN, Lukáš, Jana KOTKOVÁ, Renata ČOPJAKOVÁ, Jiří SLÁMA, Jakub TRUBAČ and Veronika DILLINGEROVÁ. Petrogenesis and Lu–Hf dating of (ultra)mafic rocks from the Kutná Hora Crystalline Complex: implications for the Devonian evolution of the Bohemian Massif. \textit{Journal of Petrology}. Oxford: Oxford University Press, 2020, vol.~61, No~8, p.~''egaa075'', 31 pp. ISSN~0022-3530. Available from: https://dx.doi.org/10.1093/petrology/egaa075.

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