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X-WR-CALNAME:Geolunch seminar @ UiB
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X-WR-CALDESC:Events for Geolunch seminar @ UiB
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TZID:Europe/Oslo
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BEGIN:VEVENT
DTSTART;TZID=Europe/Oslo:20240905T121500
DTEND;TZID=Europe/Oslo:20240905T130000
DTSTAMP:20260429T201517
CREATED:20240903T144003Z
LAST-MODIFIED:20240904T145110Z
UID:938-1725538500-1725541200@geolunch.w.uib.no
SUMMARY:Prof Delphine Rouby
DESCRIPTION:Source-To-Sink Sedimentary Budget of the African Equatorial Atlantic Rifted Margin \nProf Delphine Rouby \nDespite their very low relief and erosion rates\, non-orogenic (i.e.\, cratonic) continental domains account for over 60% of the Earth’s exposed lands. Therefore\, they contribute significantly to the clastic sediments and solutes exported to the ocean and should be accounted for in global studies. Nonetheless\, they have been much less studied than orogenic domains. In this study\, we establish the source-to-sink sedimentary budget of the sub-saharan West African cratonic domain and its Equatorial Atlantic rifted margin using published low-temperature thermochronological data to estimate onshore denudation and regional geological cross-sections to estimate offshore accumulation. We show that during and immediately following rifting (130-94 Ma)\, the build-up and subsequent erosion of rift-related relief resulted in a transient\, 100–200 km wide strip along the margin recording high denudation rates (>50 m/Myr)\, while the inland domain underwent steady and very low denudation (<10 m/Myr). Afterward\, the whole onshore domain underwent very low and steady denudation. Thus\, the changes in post-rift accumulation rates documented along the rifted margin were caused by changes in the climate and/or drainage network. During the Late Cretaceous\, we document a regional rise in accumulation rates caused by the enlargement of drainage areas feeding the basins by a hinterlandward migration of the continental divide. During the Paleogene\, we document a general drop in accumulation rates in all the basins of the African Atlantic margins caused by the global greenhouse climate\, which enhanced the development of lateritic weathering mantles\, storing clastic sediments on the continent and favoring solute exports to the ocean.
URL:https://geolunch.w.uib.no/event/delphine-rouby/
LOCATION:Kontinentalsokkelen (2G16e)\, Realfagbygget\, Allégaten 41\, Bergen\, 5007\, Norway
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DTSTART;TZID=Europe/Oslo:20240918T120000
DTEND;TZID=Europe/Oslo:20240918T133000
DTSTAMP:20260429T201517
CREATED:20240827T203832Z
LAST-MODIFIED:20240917T085850Z
UID:930-1726660800-1726666200@geolunch.w.uib.no
SUMMARY:Salt Tectonics for the energy transition
DESCRIPTION:Salt Tectonics for the energy transition \nPractice talks for the conference Unlocking the Potential of Salt Tectonics in the Energy Transition \nManel Ramos \nArchitecture and controlling factors of intra-salt layers in diapiric structures: A numerical modelling approach \nUnderstanding the structure of intra-salt layers within deformed salt bodies is crucial for effective CO2 and H2 storage in salt basins. This study employs high-resolution 2D finite element modelling to investigate how variations in salt stratigraphy and lithological variability and post-salt sedimentation patterns influence the deformation processes and the internal architecture of diapiric salt structures for different basin geometries. We test intra-salt lithological variability by varying the vertical arrangement\, viscosity and density of salt layers as well as including non-viscous (frictional-plastic) layers simulating carbonates and/or siliciclastics embedded within the layered salt sequence. The models with alternated low (1018) and high (1019 Pa×s) viscosity salt layers show significant internal salt flow partition characterized by preferential flow of the weak salt layers into the core of diapirs\, as the stronger layers remain at their flanks and/or underneath adjacent minibasins. The order of the strong and weak salt layers also has a significant impact on the overall external and internal style of salt deformation\, with both the basal and top layer being the most significant. Increasing the density of strong salt layers produce even greater internal salt flow partition with pronounced intra-diapir complexity\, convolute folding\, repetition of intra-salt stratigraphy within diapirs and occasionally boudinage. Stronger and denser layers tend to get trapped at the base of diapirs and/or underneath diapirs while being folded and refolded by flow of the intervening weaker and less-dense layers. The basin geometry and the presence of base-salt relief also have a significant influence on the basin-scale style and magnitude of salt deformation. The results can help elucidate the basin-scale controls exerted on both internal and external diapir geometries for rift basins\, which are directly applicable for various areas of the North Sea\, a key location for utilization of salt structures for geo-storage. \nLeonardo Pichel \nThe role of intra-salt stratigraphy and lithological variability on the internal and external geometry of salt bodies – a numerical modelling approach \nUmut Isikalp \nHarya Nugraha \nPDF of the conference
URL:https://geolunch.w.uib.no/event/salt-tectonics-for-the-energy-transition/
LOCATION:Kontinentalsokkelen (2G16e)\, Realfagbygget\, Allégaten 41\, Bergen\, 5007\, Norway
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DTSTART;TZID=Europe/Oslo:20240925T120000
DTEND;TZID=Europe/Oslo:20240925T130000
DTSTAMP:20260429T201517
CREATED:20240827T204500Z
LAST-MODIFIED:20240827T204500Z
UID:932-1727265600-1727269200@geolunch.w.uib.no
SUMMARY:Anna Karin Døsen (MSc)
DESCRIPTION:Salt tectonics: Sivas Basin (Turkey) \nAnna Karin Døsen
URL:https://geolunch.w.uib.no/event/anna-karin-dosen-msc/
LOCATION:Kontinentalsokkelen (2G16e)\, Realfagbygget\, Allégaten 41\, Bergen\, 5007\, Norway
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BEGIN:VEVENT
DTSTART;TZID=Europe/Oslo:20240926T121500
DTEND;TZID=Europe/Oslo:20240926T130000
DTSTAMP:20260429T201517
CREATED:20240917T081618Z
LAST-MODIFIED:20240924T134645Z
UID:943-1727352900-1727355600@geolunch.w.uib.no
SUMMARY:Robert Reinecke
DESCRIPTION:How to use an impossible map – uncertainties in modeling the global water cycle \nRobert Reinecke (Guest at the Department invited by Elco Luijendijk) \nGlobal water models allow us to explore the terrestrial water cycle in an earth-sized digital laboratory to guide science and policy. These models simulate increasingly complex representations of different compartments\, such as groundwater\, and complex processes\, such as seawater intrusion. They are coupled with other models\, bringing us closer to a digital twin of Earth and enabling us to carry out complex impact assessments of the far future. At the same time\, bias-corrected seasonal forecasts allow us to use these models as a window into the near future. However\, global water models remain highly uncertain and evaluating them remains challenging. Multiple pathways can be taken to reduce these uncertainties by collecting available knowledge in new ways and analyzing this data with new approaches. In this talk\, I will outline new strategies for assessing these complex models differently and rigorously and develop more sustainable research software for a robust science.
URL:https://geolunch.w.uib.no/event/robert-reinecke/
LOCATION:Kontinentalsokkelen (2G16e)\, Realfagbygget\, Allégaten 41\, Bergen\, 5007\, Norway
CATEGORIES:Visitor
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