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A Geophysical-Geochemical Approach to the Study of the Paleogene Julian—Slovenian Basin “Megabeds” (Southern Alps—Northwestern Dinarides, Italy/Slovenia)

1
Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
2
Georudeko, Geologija, Rudarjenje in Ekologija, (Private Limited Liability Company: Društvo sa Ograničenom Odgovornošću; D.O.O.), Anhovo 1, 5210 Deskle, Slovenia
3
Dipartimento di Matematica e Geoscienze, Università di Trieste, Via Weiss 2, 34100 Trieste, Italy
4
Dipartimento di Scienze della Terra, Università di Torino, Via Valperga Caluso 35, 10125 Torino, Italy
5
Department of Arctic Geology, University Centre in Svalbard, P.O. Box 156, N—9171 Longyearbyen, Norway
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(4), 155; https://doi.org/10.3390/geosciences9040155
Received: 4 March 2019 / Revised: 21 March 2019 / Accepted: 1 April 2019 / Published: 3 April 2019
(This article belongs to the Special Issue Geology of Mélanges)
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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. View Full-Text
Keywords: carbonate mass transport deposits; megabreccias; geoelectric profiling; geochemical fingerprinting carbonate mass transport deposits; megabreccias; geoelectric profiling; geochemical fingerprinting
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Ogata, K.; Pogačnik, Ž.; Tunis, G.; Pini, G.A.; Festa, A.; Senger, K. A Geophysical-Geochemical Approach to the Study of the Paleogene Julian—Slovenian Basin “Megabeds” (Southern Alps—Northwestern Dinarides, Italy/Slovenia). Geosciences 2019, 9, 155.

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