Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry
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...
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Earth Science Institute, Slovak Academy of Sciences, Slovakia
2015-06-01
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doaj-1fee35535b4b40cfa71eb4642f5be4cf2021-03-02T06:37:49ZengEarth Science Institute, Slovak Academy of Sciences, SlovakiaGeologica Carpathica1336-80522015-06-0166319721610.1515/geoca-2015-0020geoca-2015-0020Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistrySkála Roman0Ulrych Jaromír1Ackerman Lukáš2Krmíček Lukáš3Fediuk Ferry4Balogh Kadosa5Hegner Ernst6Institute of Geology of the Czech Academy of Sciences, v.v.i., Rozvojová 269,165 00 Praha 6, Czech RepublicInstitute of Geology of the Czech Academy of Sciences, v.v.i., Rozvojová 269,165 00 Praha 6, Czech RepublicInstitute of Geology of the Czech Academy of Sciences, v.v.i., Rozvojová 269,165 00 Praha 6, Czech RepublicInstitute of Geology of the Czech Academy of Sciences, v.v.i., Rozvojová 269,165 00 Praha 6, Czech RepublicGeohelp, Na Petřinách 1897, 162 00 Praha 6, Czech RepublicInstitute of Nuclear Research, Hungarian Academy of Sciences, Bem tér 18/C, H-4026 Debrecen, HungaryDepartment für Geowissenschaften, Universität München, Theresienstraße 41, D-8033 München, GermanyUpper 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.http://www.degruyter.com/view/j/geoca.2015.66.issue-3/geoca-2015-0020/geoca-2015-0020.xml?format=INTBohemian MassifCenozoic volcanismmelilitic rockpetrologymineralogyisotope geochemistry |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Skála Roman Ulrych Jaromír Ackerman Lukáš Krmíček Lukáš Fediuk Ferry Balogh Kadosa Hegner Ernst |
spellingShingle |
Skála Roman Ulrych Jaromír Ackerman Lukáš Krmíček Lukáš Fediuk Ferry Balogh Kadosa Hegner Ernst Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry Geologica Carpathica Bohemian Massif Cenozoic volcanism melilitic rock petrology mineralogy isotope geochemistry |
author_facet |
Skála Roman Ulrych Jaromír Ackerman Lukáš Krmíček Lukáš Fediuk Ferry Balogh Kadosa Hegner Ernst |
author_sort |
Skála Roman |
title |
Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry |
title_short |
Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry |
title_full |
Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry |
title_fullStr |
Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry |
title_full_unstemmed |
Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry |
title_sort |
upper cretaceous to pleistocene melilitic volcanic rocks of the bohemian massif: petrology and mineral chemistry |
publisher |
Earth Science Institute, Slovak Academy of Sciences, Slovakia |
series |
Geologica Carpathica |
issn |
1336-8052 |
publishDate |
2015-06-01 |
description |
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. |
topic |
Bohemian Massif Cenozoic volcanism melilitic rock petrology mineralogy isotope geochemistry |
url |
http://www.degruyter.com/view/j/geoca.2015.66.issue-3/geoca-2015-0020/geoca-2015-0020.xml?format=INT |
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