Acta Geologica Hungarica
Volume/Issue:
Volume 49: Issue 2
Geochemistry of Eocene flysch sandstones in the NW External Dinarides
Authors:
Tamás Mikes Sedimentologie/Umweltgeologie, Geowissenschaftliches Zentrum der Universität Göttingen Goldschmidtstrasse 3, D-37077 Göttingen, Germany

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István Dunkl Sedimentologie/Umweltgeologie, Geowissenschaftliches Zentrum der Universität Göttingen Goldschmidtstrasse 3, D-37077 Göttingen, Germany

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Wolfgang Frisch Institut für Geowissenschaften, Universität Tübingen Sigwartstrasse 10, D-72076 Tübingen, Germany

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Hilmar von Eynatten Sedimentologie/Umweltgeologie, Geowissenschaftliches Zentrum der Universität Göttingen Goldschmidtstrasse 3, D-37077 Göttingen, Germany

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Pages:
103–124
Online Publication Date:
25 Oct 2006
Publication Date:
01 Jun 2006
Article Category:
Research Article
DOI:
https://doi.org/10.1556/ageol.49.2006.2.2
Keywords:
geochemistry; sandstone; provenance; Dinarides; Tertiary; flysch; foreland basin; petrography
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We present the main petrographic and geochemical features of the Lower to Middle Eocene turbiditic sandstones from the northwestern portion of the External Dinaride flysch basin. Sampled areas cover SW Slovenia (Vipava and Brkini Basins) and the Istrian Peninsula (Trieste-Koper and Pazin Basins). Framework constituents of the lithic arenites reveal low-grade metamorphic, acidic plutonic, and to a lesser extent, mafic volcanic and ultrabasic sediment sources, with evidence for a small degree of sediment recycling as well. Among the processes that commonly influence sediment compositions, weathering in the source and sorting were probably negligible, but carbonate contribution of detrital or intrabasinal origin diluted the siliciclastic portions to various degrees. Main and trace element compositional data agree well with petrography and clearly indicate the predominance of felsic, crustal source lithologies. Exposed mafic-ultramafic source units were volumetrically less important.  From the Early Paleogene, extensive sediment mixing occurred in front of the Dinaride orogenic thrust wedge, with the components derived from different Dinaride units of felsic crystalline basement, platform carbonates and ophiolite. In the Eocene, a likely source of the mafic-ultramafic detritus was the Jurassic ophiolitic mélange in the NE Dinarides.

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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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Year of
Foundation		 1952
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Programme		 changed title
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Founder Magyar Tudományos Akadémia  
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Address		 H-1051 Budapest, Hungary, Széchenyi István tér 9.
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ISSN 0236-5278 (Print)
ISSN 1588-2594 (Online)

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