A2: Mass wasting deposits: From ancient catastrophic submarine collapses to recent alluvial fans; Julian Alps, Soča Valley and Adriatic coast

4 days, June 18–21, 2021, Slovenia; Trip leaders: Gale L.1, Gerčar D.1, Novak A.1, Popit T.1, Pogačnik Ž.1, Rožič B.1, Šmuc A.1, Verbovšek T.1
1University of Ljubljana, Slovenia
Contact: andrej.smuc@geo.ntf.uni-lj.si
Price: 760 EUR
Transportation: bus; Participants: Minimum 20, Maximum 30
Departure: Ljubljana (Slovenia), Aškerčeva 12 (8:00, Department of Geology building); Return: Prague, Hotel Diplomat (overnight bus drive from Slovenia to Czech Republic)
Includes: field trip guidebook, transportation in Slovenia and coach from Slovenia to Czech Republic, accommodation, breakfasts, lunch packets, snacks and dinners. Degree of physical difficulty: basic to intermediate level of physical fitness is required. The trip will include short (up to few km long) walks; frequently on unpaved floors (trekking shoes and walking sticks are recommended).
Mass movements represent important processes that shape the surface of the Earth. This trip will present an overview of recent and ancient mass movements in variety of different settings: from recent slope processes to Mesozoic massive submarine platform collapses. Holocene: Tamar and Soča valleys are alpine valleys filled with Holocene rock falls, landslides, debris-flows, mudflows and fluvial deposits. They are forming talus slopes, alluvial and debris-flow fans, each of them with a complex history of sedimentation and erosion. Quaternary: Vipava valley represents a ‘’tectonic’’ topography with steeply deeping Mesozoic carbonates thrusted over gently-sloping Palaeogene flysch. This facilitated the formation of complex Quaternary sedimentary slope system (debris-flows, scree, mud-flows, rock avalanches, rotational and translational landslide). At the Adriatic coast ongoing cliff evolution will be observed. Mesozoic-Cenozoic: In the middle Soča Valley we will observe three ancient mass movement deposits. Carnian extensional blocky breccia with up to 300m large blocks was deposited in the toe-of-slope. Middle Jurassic basinal blocky limestone breccia that documents the transition to compressional regime. Paleogene up to 250m thick massive blocky breccias related to thrusting and foreland basin formation.
Left: Glacial valley with numerous Holocene rock falls, lanslides and mudflows forming talus slopes and alluvial fans. Tamar Valley; Right: Paleogene flysch deposits with massive slope failure breccias. Anhovo quarry.
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