Seds Online Webinars
At Seds Online, we host regular Webinars for the community. Recognising the incredibly broad spectrum of subject matter within our discipline, we aim to provide a structured, balanced, program that covers a range of topics.
Upcoming Webinars & Events
9 AM LONDON Wednesday 28th October 2020
Chasing earthquake and volcanism signals in a deep marine channel: the Hikurangi Channel, New Zealand
Lorna Strachan – University of Auckland
The deep marine Hikurangi Channel, located off the east coast of New Zealand, is a colossus. More than four times longer than any other located at an active continental margin, this trench-axis conduit can be traced for ~2000 km. Rapid continental uplift and frequent earthquakes associated with Hikurangi Subduction Margin and volcanic eruptions in the Taupō Volcanic Zone, together with active temperate weather systems mean that vast amounts of terrestrial, volcanic and shelfal sediment, nutrients, and (today) pollutants, are focussed through several canyons that feed the Hikurangi Channel. Recurrent powerful, sediment-laden underwater flows, known as turbidity currents, over the last 40,000 years, have left a remarkable and highly expanded >100 m thick turbidite record that is allowing us to unravel the earthquake and volcanic signal of this margin over Quaternary timescales. Here I will discuss results from a large group of researchers working on understanding the Quaternary sedimentary systems of the Hikurangi Subduction margin. This will include preliminary results from IODP site 1520, together with multiple Holocene aged short cores (<10 m thick).
4 PM LONDON Wednesday 16th November 2020
Supercritical flows: the sedimentology of the illustrious upper flow-regime
Arnoud Slootman – King Fahd University of Petroleum &Minerals
Bedforms are the morphological patterns on the sediment bed originating from coherent structures in fluid flows. The classical grouping of bedforms into the lower and upper regimes follows the transition from subcritical to supercritical flow as the Froude number passes a critical value. The revival of academic interest in supercritical flows and their products over the past two decades is attributed to the most recent addition to the supercritical palette: cyclic steps. This alternating pattern of subcritical and supercritical flow results from the flow overstepping the boundary between stable and unstable behaviour as predicted by the Vedernikov number. Waves at the upper flow boundary are key to understanding the transitions between the stable subcritical (ripples and dunes), stable supercritical (antidunes) and unstable supercritical (cyclic steps) regimes. In this talk we review our knowledge on the sedimentological aspects of supercritical flows and explore which questions remain to be answered.
4 PM LONDON Wednesday 11th November 2020
Mudstones as critical components of sub-surface energy systems: the role of multi-scale observations and novel analysis techniques in driving future research
Kevin Taylor – University of Manchester
Mudstones have for a long time been a focus in energy systems due to their critical role as source rocks for oil/gas, as caprocks/seals to oil and gas reservoirs, and more recently as important oil and gas reservoirs in themselves. Gas will continue to be an important fuel for the energy transition but mudstones also have a critical role to play as we decarbonise the sub-surface energy system. They will continue to act as key seals, but now for geological CO2 storage as well as for hydrogen and thermal energy storage. They may in themselves be potential CO2 storage sites and they are key radiogenic contributors to heat in sedimentary basins. Finally, they form one of the potential targets for long-term geo-disposal of nuclear waste. Our understanding of their multi-scale variability in properties such as porosity/permeability, susceptibility to gas migration, geomechanics and fracture propensity, as well as compositional and textural variability, will be key to maximising low-carbon energy systems. To address these challenges we will continue to need seismic and field-scale observations, as well as high resolution 2D analysis (e.g. SEM. TEM), but will increasingly need 3D electron, X-ray, synchrotron and neutron observations, as well as 4D experiments under sub-surface realistic conditions. This presentation will highlight where some of these opportunities lie for the sedimentological/geochemical/mineralogical community.
4 PM LONDON Wednesday 9th December 2020
Always a White Christmas in the Bahamas – Ocean Chemistry and Hydrodynamics Focus Winter Mud Production on Great Bahama Bank
Sam Purkis – University of Miami
Whitings, or occurrences of fine-grained carbonate within the water column, have been observed in modern environments with salinities ranging from fresh to marine conditions, and thick deposits of lime mud are described throughout the geological record. Despite their ubiquity, the trigger for whitings has been a conundrum under debate for more than eighty years. This talk will review the trigger for whitings atop the Great Bahama Bank and call upon hydrodynamic simulation and geochemical modelling to explore the diverse triggers of the lime mud factory. The results have implications for the interpretation of whitings mud in the geological record, including the geochemical signatures within it.
19th-23rd December 2020
59th BSRG AGM
British Sedimentological Research Group
We are pleased to announce that Seds Online will be hosting BSRG this year! For those of you who do not know the conference, check it out here: https://www.liverpool.ac.uk/earth-ocean-and-ecological-sciences/events/bsrg/. We hope that global interest in the 59th BSRG will help to build valuable collaborations into 2021, and allow attendance for many who wouldn’t otherwise be able to come along!