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X-WR-CALDESC:Events for Geolunch seminar @ UiB
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DTSTART;TZID=Europe/Oslo:20241204T001500
DTEND;TZID=Europe/Oslo:20241204T130000
DTSTAMP:20260429T033704
CREATED:20241112T214035Z
LAST-MODIFIED:20241202T140410Z
UID:1007-1733271300-1733317200@geolunch.w.uib.no
SUMMARY:Sebastian Wolf
DESCRIPTION:How to invert extensional basins – modelling the influence of pre-collisional extension on 3D mountain belt architecture \nSebastian Wolf \nThe geological record shows that many orogens\, like the Andes\, Pyrenees\, Atlas\, and Greater Caucasus form to a large degree by inversion of pre-collisional extensional basins that are typically offset and show different degrees of basin linkage. However\, the 3D dynamics of inverting offset extensional basins and their importance for mountain building remain poorly understood. To bridge that knowledge gap\, we use 3D state-of-the-art geodynamic models coupled to a fluvial surface processes model to investigate the dynamics of extensional-basin inversion during continent-continent collision. We find that a) basins link during the extensional stage if basin off-set is not too large; b) inversion of off-set rift basins naturally tends to create opposite polarity subduction\, which reverts the plan-view structure of the mountain belt; c) same-polarity subduction requires further weaknesses\, but preserves the structure of the extensional basins in the mountain belt. The distribution and orientation of topography and fluvial valleys tracks the deep-structure and can be used as indicators. Based on these model characteristcs and backed by a force-balance analysis\, we compare the model results to the Pyrenees\, Atlas\, and Greater Caucasus.
URL:https://geolunch.w.uib.no/event/sebastian-wolf-5/
LOCATION:Kontinentalsokkelen (2G16e)\, Realfagbygget\, Allégaten 41\, Bergen\, 5007\, Norway
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DTSTART;TZID=Europe/Oslo:20241211T120000
DTEND;TZID=Europe/Oslo:20241211T130000
DTSTAMP:20260429T033704
CREATED:20240827T204802Z
LAST-MODIFIED:20241210T132940Z
UID:935-1733918400-1733922000@geolunch.w.uib.no
SUMMARY:Albina Gilmullina
DESCRIPTION:Cretaceous source to sink system on the Norwegian Continental Shelf \nAlbina Gilmullina \nThe several kilometers thick succession of Cretaceous strata on the Norwegian Continental Shelf bears witness to a period characterised by contemporaneous hinterland uplift\, basin subsidence and high sedimentation rates. The northern part of the NCS – informally referred to as the Greater Barents Sea Basin (GBSB) – represented an epicontinental sea dominated by mud-dominated clinoforms exhibiting a wide range of progradational directions. Multiple source areas have thus been suggested based on paleocurrent measurements onshore Svalbard\, seismic mapping\, petrological analyses\, as well as limited provenance data. Although the Lower Cretaceous succession has received considerable attention\, Upper Cretaceous strata\, which is severely eroded across much of the area\, is under-explored. Therefore\, volumetric calculations and an in-depth understanding of provenance variations for the whole Cretaceous succession of the GBSB are currently lacking.\nIn this study\, we use >3500 2D seismic lines over the area of 1.500.000 km2 to map Cretaceous sequences from the Eastern and Western Barents Sea and calculate sediment input rates (megatons/year) for eight different seismic units spanning from the Valanginian to the Campanian. We provide new detrital zircon dates from the Lower Cretaceous succession onshore Svalbard. Collectively\, this provides insights into sediment volumes\, provenance and sediment supply variations during the Cretaceous in the GBSB.
URL:https://geolunch.w.uib.no/event/albina-gilmullina-3/
LOCATION:Kontinentalsokkelen (2G16e)\, Realfagbygget\, Allégaten 41\, Bergen\, 5007\, Norway
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