Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: Petrology and mineral chemistry

Roman Skála, Jaromír Ulrych, Lukáš Ackerman, Lukáš Krmíček, Ferry Fediuk, K. Balogh, Ernst Hegner

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Upper Cretaceous to Pleistocene volcanic rocks of the Bohemian Massif represent the easternmost part of the Central European Volcanic Province. These alkaline volcanic series include rare melilitic rocks occurring as dykes, sills, scoria cones and flows. They occur in three volcanic periods: (i) the Late Cretaceous to Paleocene period (80-59 Ma) in northern Bohemia including adjacent territories of Saxony and Lusatia, (ii) the Mid Eocene to Late Miocene (32.3-5.9 Ma) period disseminated in the Ohře Rift, the Cheb-Domažlice Graben, Vogtland, and Silesia and (iii) the Early to Late Pleistocene period (1.0-0.26 Ma) in western Bohemia. Melilitic magmas of the Eocene to Miocene and Pleistocene periods show a primitive mantle source [(143Nd/144Nd)t=0.51280-0.51287; (87Sr/86Sr)t=0.7034-0.7038)] while those of the Upper Cretaceous to Paleocene period display a broad scatter of Sr-Nd ratios. The (143Nd/144Nd)t ratios (0.51272-0.51282) of the Upper Cretaceous to Paleocene rocks suggest a partly heterogeneous mantle source, and their (87Sr/86Sr)t ratios (0.7033-0.7049) point to an additional late-to post-magmatic hydrothermal contribution. Major rock-forming minerals include forsterite, diopside, melilite, nepheline, sodalite group minerals, phlogopite, Cr-and Ti-bearing spinels. Crystallization pressures and temperatures of clinopyroxene vary widely between ~1 to 2 GPa and between 1000 to 1200 °C, respectively. Nepheline crystallized at about 500 to 770 °C. Geochemical and isotopic similarities of these rocks occurring from the Upper Cretaceous to Pleistocene suggest that they had similar mantle sources and similar processes of magma development by partial melting of a heterogeneous carbonatized mantle source.

Original languageEnglish
Pages (from-to)197-216
Number of pages20
JournalGeologica Carpathica
Volume66
Issue number3
DOIs
Publication statusPublished - Jun 1 2015

Fingerprint

petrology
volcanic rock
mantle source
Pleistocene
Cretaceous
Paleocene
mineral
nepheline
rock
sodalite group
Eocene
Miocene
melilite
forsterite
phlogopite
diopside
sill
graben
clinopyroxene
partial melting

Keywords

  • Bohemian Massif
  • Cenozoic volcanism
  • isotope geochemistry
  • melilitic rock
  • mineralogy
  • petrology

ASJC Scopus subject areas

  • Geology

Cite this

Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif : Petrology and mineral chemistry. / Skála, Roman; Ulrych, Jaromír; Ackerman, Lukáš; Krmíček, Lukáš; Fediuk, Ferry; Balogh, K.; Hegner, Ernst.

In: Geologica Carpathica, Vol. 66, No. 3, 01.06.2015, p. 197-216.

Research output: Contribution to journalArticle

Skála, Roman ; Ulrych, Jaromír ; Ackerman, Lukáš ; Krmíček, Lukáš ; Fediuk, Ferry ; Balogh, K. ; Hegner, Ernst. / Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif : Petrology and mineral chemistry. In: Geologica Carpathica. 2015 ; Vol. 66, No. 3. pp. 197-216.
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