Acta Geologica Hungarica
Volume/Issue:
Volume 46: Issue 1
Geochemistry and petrogenesis of Early Cretaceous alkaline igneous rocks in Central Europe: implications for a long-lived EAR-type mantle component beneath Europe
Authors:
Szabolcs Harangi Department of Petrology and Geochemistry, Eötvös Loránd University, Budapest H-1117 Budapest, Pázmány Péter sétány 1/c, Hungary

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Sonia Tonarini CNR-Institute of Geosciences and Earth Resources,Pisa Viale Moruzzi, 1, 56124 Pisa, Italy

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Orlando Vaselli Department of Earth Sciences, University of Florence Via G. La Pira, 4, 50 121 Florence, Italy

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Piero Manetti Department of Earth Sciences, University of Florence Via G. La Pira, 4, 50121 Florence, Italy

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Pages:
77–94
Online Publication Date:
19 Jul 2005
Publication Date:
01 Jul 2003
Article Category:
Research Article
DOI:
https://doi.org/10.1556/ageol.46.2003.1.6
Keywords:
Moravian-Silesian Beskidy; Moravian-Silesian Beskidy; Moravian-Silesian Beskidy; Mecsek; Cretaceous; trace element and Sr-Nd isotope geochemistry; petrogenesis; European Asthenospheric Reservoir; plume
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In Central Europe, Early Cretaceous alkaline igneous rocks (lamprophyres, basanites, phonolites) occur in the Moravian-Silesian Beskidy area (northern Czech Republic and southern Poland) and in the Mecsek-Alföld Zone (southern Hungary). Presently they are located at about 400 km distance of each other. These alkaline igneous rocks show close similarities in their mineral, chemical, and bulk rock compositional data, implying similar petrogenesis and suggesting that these two regions could have been much closer during the Early Cretaceous; they could belong to the same rift zone in the European continental margin. Their trace element distribution and Sr and Nd isotopic ratios suggest that the parental magmas derived from an enriched, HIMU OIB-like asthenospheric mantle by different degrees (3-6%) of partial melting at the depth of spinel-garnet transitional and garnet stabilization zone (about 60-80 km depth). This mantle source appears to be akin to that thought to have supplied the Tertiary to Quaternary alkaline mafic magmas in Europe (EAR=European Asthenospheric Reservoir). This may imply that this EAR-type mantle reservoir could have been present beneath Europe at least since the Early Cretaceous. It could reside at the base of the upper mantle (670 km discontinuity) supplying upwelling hot mantle fingers, or it may represent a long-lasting, polluted (HIMU+depleted MORB mantle) upper mantle at shallow depth beneath Europe.

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Cover Acta Geologica Hungarica
Acta Geologica Hungarica
Print ISSN:
0236-5278
Online ISSN:
1588-2594

Acta Geologica Hungarica
Language English
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