A geophysical-geochemical approach to the study of the paleogene julian-slovenian basin “megabeds” (Southern alps-northwestern dinarides, Italy/Slovenia)

Kei Ogata*, Željko Pogačnik, Giorgio Tunis, Gian Andrea Pini, Andrea Festa, Kim Senger

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The Paleogene “megabeds” of the Julian-Slovenian Basin are regional, basin-wide deposits, produced by catastrophic carbonate platform collapses. They record the emplacement of a bipartite slide mass behaving as a cohesive blocky/debris flow in the lower part, and as a grain to turbulent flow in the upper part. Several types of primary (sedimentary) soft sediment deformation structures testify fluid overpressure conditions during emplacement. Such structures are identified within a brecciated, fine grained matrix that encloses and intrudes slide blocks and clasts, characterized by NE-, NW-and SW-directed paleo-transport directions, indicating a depositional setting close to the basin margins. Here we present an updated review of some representative megabeds, exposed in the open-pit quarry outcrops of Anhovo (SW Slovenia). In particular, we here discuss new interpretations based on X-ray fluorescence spectrometry (XRF), thermo-gravimetry (TG) and electric resistivity tomography (ERT). Our results indicate that basal marly clasts of the megabeds are markedly different from the uppermost draping marls, suggesting two different coeval sources. The relationships with the underlying successions are strongly erosive, with deep localized scouring of the substrate and amalgamations between different megabeds, and the depositional units inside individual megabeds, supporting the geochemical differences.

Original languageEnglish
Article number155
Pages (from-to)1-17
Number of pages17
JournalGeosciences (Switzerland)
Volume9
Issue number4
DOIs
Publication statusPublished - 3 Apr 2019

Bibliographical note

Special Issue: Geology of Mélanges

Keywords

  • Carbonate mass transport deposits
  • Geochemical fingerprinting
  • Geoelectric profiling
  • Megabreccias

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