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@article{1735183,
author = {Krmíček, Lukáš and Ulrych, Jaromír and Jelínek, Emil and Skála, Roman and Krmíčková, Simona and Korbelová, Zuzana and Balogh, Kadosa},
article_location = {Wien},
article_number = {2},
doi = {http://dx.doi.org/10.1007/s00710-020-00729-5},
keywords = {Ohře/Eger rift; Picrite; Meimechite; Basanite/tephrite; K-Ar ages; Sr-Nd-Pb isotopes},
language = {eng},
issn = {0930-0708},
journal = {Mineralogy and Petrology},
title = {Petrogenesis of Cenozoic high-Mg (picritic) volcanic rocks in the České středohoří Mts. (Bohemian Massif, Czech Republic)},
url = {https://doi.org/10.1007/s00710-020-00729-5},
volume = {115},
year = {2021}
}
TY - JOUR
ID - 1735183
AU - Krmíček, Lukáš - Ulrych, Jaromír - Jelínek, Emil - Skála, Roman - Krmíčková, Simona - Korbelová, Zuzana - Balogh, Kadosa
PY - 2021
TI - Petrogenesis of Cenozoic high-Mg (picritic) volcanic rocks in the České středohoří Mts. (Bohemian Massif, Czech Republic)
JF - Mineralogy and Petrology
VL - 115
IS - 2
SP - 193-211
EP - 193-211
PB - Springer Wien
SN - 09300708
KW - Ohře/Eger rift
KW - Picrite
KW - Meimechite
KW - Basanite/tephrite
KW - K-Ar ages
KW - Sr-Nd-Pb isotopes
UR - https://doi.org/10.1007/s00710-020-00729-5
L2 - https://doi.org/10.1007/s00710-020-00729-5
N2 - Representative samples of high-Mg (picritic) rocks of Eocene to Oligocene age (38 to 21 Ma) from the Ceske stredohori Mts. (CSM) in the Ohre/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 (Fo(86-80)) + 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.
ER -
KRMÍČEK, Lukáš, Jaromír ULRYCH, Emil JELÍNEK, Roman SKÁLA, Simona KRMÍČKOVÁ, Zuzana KORBELOVÁ a Kadosa BALOGH. Petrogenesis of Cenozoic high-Mg (picritic) volcanic rocks in the České středohoří Mts. (Bohemian Massif, Czech Republic). \textit{Mineralogy and Petrology}. Wien: Springer Wien, 2021, roč.~115, č.~2, s.~193-211. ISSN~0930-0708. Dostupné z: https://dx.doi.org/10.1007/s00710-020-00729-5.
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