Detail publikačního výsledku

Petrogenesis of Cenozoic high-Mg (picritic) volcanic rocks in the České středohoří Mts. (Bohemian Massif, Czech Republic)

KRMÍČEK, L.; ULRYCH, J.; JELÍNEK, E.; SKÁLA, R.; KRMÍČKOVÁ, S.; KORBELOVÁ, Z.; BALOGH, K.

Originální název

Petrogenesis of Cenozoic high-Mg (picritic) volcanic rocks in the České středohoří Mts. (Bohemian Massif, Czech Republic)

Anglický název

Petrogenesis of Cenozoic high-Mg (picritic) volcanic rocks in the České středohoří Mts. (Bohemian Massif, Czech Republic)

Druh

Článek WoS

Originální abstrakt

Representative samples of high-Mg (picritic) rocks of Eocene to Oligocene age (38 to 21 Ma) from the České středohoří Mts. (CSM) in the Ohře/Eger Rift were studied and compared with Cenozoic high-Mg rocks from the Bohemian Massif. The picritic rocks of the CSM correspond to picrite, meimechite and basanite to tephrite. Individual petrographic types are characterised by the association of mafic minerals: magnesian olivine (Fo86-80) + clinopyroxene (aluminian diopside) +/- amphibole (pargasite/kaersutite) +/- dark mica (ferroan phlogopite). The contents of incompatible elements, such as Nb, Ta, U, Th, the La-N/Yb-N ratios, and the overall Sr-Nd-Pb isotope signatures of the high-Mg rocks partly overlap the basanites of the usti Formation, also showing a similar age (44-21 Ma). The Pb isotope signature for all recognised high-Mg rock types is compatible with a variable contribution from an inherited (Variscan) orogenic Pb component preserved in their lithospheric mantle source. Both the high-Mg volcanic rocks from the CSM and from other areas of the Bohemian Massif require the involvement of a heterogenous lithospheric source. Their parental melts were generated by variable degree of melting of an olivine-rich peridotitic mantle, containing clinopyroxene-amphibole (+/- phlogopite) vein assemblages with highly radiogenic Sr and Pb signatures.

Anglický abstrakt

Representative samples of high-Mg (picritic) rocks of Eocene to Oligocene age (38 to 21 Ma) from the České středohoří Mts. (CSM) in the Ohře/Eger Rift were studied and compared with Cenozoic high-Mg rocks from the Bohemian Massif. The picritic rocks of the CSM correspond to picrite, meimechite and basanite to tephrite. Individual petrographic types are characterised by the association of mafic minerals: magnesian olivine (Fo86-80) + clinopyroxene (aluminian diopside) +/- amphibole (pargasite/kaersutite) +/- dark mica (ferroan phlogopite). The contents of incompatible elements, such as Nb, Ta, U, Th, the La-N/Yb-N ratios, and the overall Sr-Nd-Pb isotope signatures of the high-Mg rocks partly overlap the basanites of the usti Formation, also showing a similar age (44-21 Ma). The Pb isotope signature for all recognised high-Mg rock types is compatible with a variable contribution from an inherited (Variscan) orogenic Pb component preserved in their lithospheric mantle source. Both the high-Mg volcanic rocks from the CSM and from other areas of the Bohemian Massif require the involvement of a heterogenous lithospheric source. Their parental melts were generated by variable degree of melting of an olivine-rich peridotitic mantle, containing clinopyroxene-amphibole (+/- phlogopite) vein assemblages with highly radiogenic Sr and Pb signatures.

Klíčová slova

Ohře/Eger rift; Picrite; Meimechite; Basanite/tephrite; K-Ar ages; Sr-Nd-Pb isotopes

Klíčová slova v angličtině

Ohře/Eger rift; Picrite; Meimechite; Basanite/tephrite; K-Ar ages; Sr-Nd-Pb isotopes

Autoři

KRMÍČEK, L.; ULRYCH, J.; JELÍNEK, E.; SKÁLA, R.; KRMÍČKOVÁ, S.; KORBELOVÁ, Z.; BALOGH, K.

Rok RIV

2022

Vydáno

15.04.2021

Nakladatel

SPRINGER WIEN

Místo

WIEN

ISSN

0930-0708

Periodikum

MINERALOGY AND PETROLOGY

Svazek

115

Číslo

2

Stát

Rakouská republika

Strany od

193

Strany do

211

Strany počet

19

URL

https://link.springer.com/article/10.1007/s00710-020-00729-5

BibTex

@article{BUT175340,
  author="Lukáš {Krmíček} and Jaromír {Ulrych} and Emil {Jelínek} and Roman {Skála} and Simona {Krmíčková} and Zuzana {Korbelová} and Kadosa {Balogh}",
  title="Petrogenesis of Cenozoic high-Mg (picritic) volcanic rocks in the České středohoří Mts. (Bohemian Massif, Czech Republic)",
  journal="MINERALOGY AND PETROLOGY",
  year="2021",
  volume="115",
  number="2",
  pages="193--211",
  doi="10.1007/s00710-020-00729-5",
  issn="0930-0708",
  url="https://link.springer.com/article/10.1007/s00710-020-00729-5"
}