Publication detail

The story of post-Variscan lamprophyres of the Bohemian Massif: from ultramafic (Upper Cretaceous–Paleocene) to alkaline (Eocene–Oligocene) types

ULRYCH, J. KRMÍČEK, L. ADAMOVIČ, J. KRMÍČKOVÁ, S.

Original Title

The story of post-Variscan lamprophyres of the Bohemian Massif: from ultramafic (Upper Cretaceous–Paleocene) to alkaline (Eocene–Oligocene) types

Type

book chapter

Language

English

Original Abstract

Post-Variscan lamprophyres of the Bohemian Massif hold the potential for the understanding of deep-mantle processes beneath the Bohemian Massif in association with mantle metasomatism as a consequence of Variscan subduction and Late Paleozoic extension in Central Europe, and tectonic processes between Variscan blocks. Two principal types of post-Variscan lamprophyres occur in the Bohemian Massif, contrasting in their age and composition: ultramafic lamprophyres of Late Cretaceous to Paleocene age and alkaline lamprophyres of Mid Eocene to Late Oligocene age. Combination of published and new whole-rock, isotope (Sr–Nd–Pb) and radiometric (K/Ar) data on lamprophyres of both types (including new data from samples from the deep boreholes) significantly contributes to the understanding of the changing tectonomagmatic position of post-Variscan volcanism in the Bohemian Massif. The striking shift in lamprophyre geochemistry is paralleled by a change in their structural position from the initial pre-rift period of volcanism to the developed syn-rift period and the related change in their mantle sources beneath the Bohemian Massif. The Late Cretaceous and Cenozoic volcanism is explained as related to lithospheric flexuring during the Alpine orogeny, resulting in an asthenospheric upwelling, or associated with the lithosphere deformation and perturbation of the thermal boundary layer.

Keywords

Bohemian Massif; post-Variscan; lamprophyres; geochemistry

Authors

ULRYCH, J.; KRMÍČEK, L.; ADAMOVIČ, J.; KRMÍČKOVÁ, S.

Released

9. 2. 2022

Publisher

Geological Society of London

Location

Bath

ISBN

978-1-78620-543-8

Book

Lamprophyres, Lamproites and Related Rocks: Tracers to Supercontinent Cycles and Metallogenesis

Edition

513

Edition number

1

ISBN

0305-8719

Periodical

Geological Society Special Publication

State

unknown

Pages from

237

Pages to

269

Pages count

33

URL

https://sp.lyellcollection.org/content/513/1/237

BibTex

@inbook{BUT176749,
  author="Jaromír {Ulrych} and Lukáš {Krmíček} and Jiří {Adamovič} and Simona {Krmíčková}",
  title="The story of post-Variscan lamprophyres of the Bohemian Massif: from ultramafic (Upper Cretaceous–Paleocene) to alkaline (Eocene–Oligocene) types",
  booktitle="Lamprophyres, Lamproites and Related Rocks: Tracers to Supercontinent Cycles and Metallogenesis",
  year="2022",
  publisher="Geological Society of London",
  address="Bath",
  series="513",
  edition="1",
  pages="237--269",
  doi="10.1144/SP513-2020-233",
  isbn="978-1-78620-543-8",
  url="https://sp.lyellcollection.org/content/513/1/237"
}