Szczecin Marginal Seas Webinars | czerwiec 2023
Serdecznie zapraszamy na ostatnie spotkanie w ramach serii webinariów Szczecin Marginal Seas Webinars w semestrze letnim 2022/2023 na Webinar, który odbędzie się 15 czerwca, 2023 o 14:00 (CET).
Dołącz do naszego spotkania na wykład:
Anatomy and stratigraphic evolution of a shelf bypass valley system, Hottentots Bay, Namibia
prezentowany przez:
Prof. Dr. Andrew Green
Geological Sciences, University of KwaZulu-Natal, Durban, ZA
Abstract
The conditions required for incised valleys to form relate to three main variables. The first is associated with a decline in base level or sea level, whereby the palaeo-shelf is exposed to subaerial processes of erosion. If the palaeo-shelf gradient is considerably steeper than the adjacent palaeo-alluvial plain, valley incision will commence. This invariably relates to the crossing of a topographic threshold, where a knickpoint is formed and upslope erosion of the valley can begin. Valley incision will not take place if the shoreline trajectories migrate over palaeo-surfaces where the gradient is lower or equivalent to that of the palaeo-alluvial plain and no knick-point is present. In such instances, lowstand alluvial systems will develop, however, most of the fluvial sediment load bypasses the shelf and non-incised bypass systems will form. In these systems the relationships between incision, available accommodation, and infilling that mark simple (single-incision) or complex (multi-incision) systems preclude the development of typical tripartite facies models of incised valley fill. Unlike traditional incised valleys, that can extend from submarine canyon heads to highstand shorelines, these systems are typically confined to the inner-shelf as the decline in sea level does not reach the shelf edge resulting in re-incision.
This paper investigates a valley preserved on the wide and deep Namibian shelf and examines its stratigraphic architecture and evolution in high spatial resolution. The remarkable depth of the shelf break (~ 500 m) and its width (> 200 km) mean that the sea level falls of the Pleistocene did not intersect the shelf break, and instead, bypassing conditions have prevailed over multiple highstand and lowstand periods. The result is an unusually wide series of shallowly incised channels with a very thin fill, the age of which spans upwards of 65 Ma. The gravel-like nature of the fill relates to strong winnowing of the early valley fill material, coupled to a non-depositing regime due to the bypass system developed.
Seminarium odbędzie się w formie online na platformie MS Teams.
Pokój spotkań będzie otwarty od 13:30 (CET), ale seminarium zacznie się o 14:00 (CET).
By dołączyć do spotkania użyj tego linku.
AMU Invited Lecture Series in Marine Geosciences I
Serdecznie zapraszamy do wzięcia udziału w wykładzie online pod tytułem “Benthic foraminifera: their diversity and role in deep-sea ecosystems”, który wygłosi prof. Andrew J. Gooday (National Oceanography Centre - Southampton, UK). Wykład stanowi część serii “AMU Invited Lecture Series in Marine Geosciences I” organizowanej przez Uniwersytet im. Adama Mickiewicza w Poznaniu w ramach programu ID UB UAM. Wykład odbędzie się w czwartek (18 maja) o godzinie 16:30 na platformie MS Teams (link: https://t.co/hmK54rPj5K ). Wykład i otwarta dyskusja po wykładzie będą w języku angielskim.
Informacja o wykładowcy i wykładzie:
Professor Gooday is the author of 223 papers (H=57) focused mainly on foraminifera and deep-sea environments. He has broad interests in the biodiversity, biogeography and ecology of modern benthic foraminifera, xenophyophores, and gromiids (testate protists). Andrew Gooday is an undisputed authority in these areas. He is mainly interested in deep-sea environments, species taxonomy, marine ecology, and linkages between biotic and abiotic factors. He serves as Associate Editor of Deep-Sea Research I journal. Nowadays, he works on foraminiferal biodiversity and biogeography combining classical morphological methods with modern molecular approaches to define species ranges more precisely.
Abstract:
Foraminifera are a major group of shell-bearing (testate) protists that have an outstanding fossil record and are widely used as proxies for environmental conditions in ancient oceans. However, foraminifera are also very important constituents of modern marine benthic ecosystems and often constitute a dominant faunal group in deep-sea environments. In this talk, I will review what is known about their biodiversity and likely ecological roles in deep-sea habitats, particularly on the vast abyssal plains that occupy much of the deep ocean floor.
Szczecin Marginal Seas Webinars - semestr letni 2023
InterRidge 2023 Webinar Series | Dr. David W. Scholl
Biuro InterRidge zaprosiło dr. Davida W. Scholla (starszego naukowca badawczego Emeritusa w United States of Geological Survey) na webinarium. Wygłosi wykład pdt: "Atypical Origin and Evolution of the Aleutian-Bering Marginal Sea". Szczegółowe informacje można znaleźć na stronie internetowej InterRidge (https://interridge.org/webinar/).
Atypical Origin and Evolution of the Aleutian-Bering Marginal Sea
Dr. David W. Scholl (Senior Research Scientist, Emeritus w United States of Geological Survey) Dzień i czas: 14:00 GMT (10:00 EST), wtorek, 23 maja 2023 r.
Adres Zoom: https://snu-ac-kr.zoom.us/j/96340741405?pwd=WDJqVlkwY0xUVW41ZVdtLzlxM0Jzdz09 Numer ID spotkania: 963 4074 1405 Hasło: 815071
Szczecin Marginal Seas Webinars w kwietniu 2023
Serdecznie zapraszamy do udziału w drugiej prezentacji cyklu Szczecin Marginal Seas Webinars w semestrze letnim 2022/2023, która odbędzie się 20 kwietnia 2023 r. o godzinie 14:00 (CET).
Dołącz na wykład:
A hidden climate system component: observations and modelling of subsea permafrost
prezentowany przez
Dr. Paul Overduin
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
Spotkanie odbędzie się w formie online na platformie MS Teams. Pokój spotkań zostanie otwarty od godziny 13:30 (CET), jednak seminarium rozpocznie się o godzinie 14:00 (CET).
Kliknij by dołączyć do spotkania
Meeting ID: 387 708 672 145
Passcode: cnfYRb
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