Publication detail

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.

Original Title

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

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

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

Authors

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

Released

15. 4. 2021

Publisher

SPRINGER WIEN

Location

WIEN

ISBN

0930-0708

Periodical

MINERALOGY AND PETROLOGY

Year of study

115

Number

2

State

Republic of Austria

Pages from

193

Pages to

211

Pages count

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"
}