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
4 PM LONDON, Wednesday 12th August 2020
Salt on Mars: Astrobiological Tombs?
Kathleen C. Benison – West Virginia University
Kathleen is a science team member for Mars 2020, This talk will give an overview of halite and gypsum on Mars and describe their potential to host microorganisms and organic compounds as solid inclusions and within fluid inclusions – as salt minerals on Earth do. The talk will place the search for life in salt minerals on Mars in context of the sample return plan for the Perseverance rover.
4 PM LONDON, Wednesday 26th August 2020
Sedimentology in the Anthropocene
Speaker and details coming soon…
4 PM LONDON, Wednesday 2nd September 2020
The ugly duckling of coastal environments: Microtidal meanders and their deposits; A lesson from the Venice Lagoon (Italy)
Massimiliano Ghinassi – Università degli Studi di Padovav
Sedimentology of tidal meanders has received comparably much less attention than that of river meanders, and facies models for tidal point bars were developed in the shade of their fluvial counterparts, driven by the simplistic assumption that tidal and fluvial meanders are characterized by similar planform morphologies and dynamics, together with accretional and erosional processes along the inner and outer bank, respectively. This general lack of attention for tidal meanders runs parallel with their scarce documentation in the ancient record, a knowledge gap that contrasts with their widespread incidence in modern coastal plains, where they play a fundamental control on landscape evolution. Knowledge about tidal meanders and their deposits is even weaker when considering those developed in coastal regions characterized by a microtidal regime (e.g Mediterranean Basin, Gulf of Mexico and the Baltic Sea). The Venice Lagoon (Northeastern coast of Italy) includes a wide spectrum of meandering channels developed in a microtidal regime, and provides a unique laboratory to investigate their morphodynamic evolution and the related sedimentary products. The Venice Lagoon has a total surface of about 550 km2 and represents the largest brackish water body of the Mediterranean Basin. The Lagoon has an elongated shape trending NE-SW and has mean water depth of tidal flat and subtidal platform of about 1.5 m. It is connected to the sea through three inlets, where the maximum water excursion is ±0.75 m around Mean Sea Level. Nowadays, the Lagoon does not receive any relevant fluvial sediment supply, and is surrounded by densely-vegetated saltmarshes. Tidal channels are up to 15 m deep and form a complex network that drains saltmarshes, tidal flats and adjacent subtidal platforms. This talk will provide an overview on morphological and sedimentological processes concurring to shape these channels and build up related pointbar bodies. Specifically, it will illustrate planform geometries and migration rates of channel bends developed at different scales, and will depict depositional geometries developed under the interaction between lateral migration and vertical aggradation. The signature of tidal processes will be shown and compared with that recorded in deposits accumulated where tidal range is higher. Finally, stratal architecture and sedimentary facies distribution in subtidal pointbars will be also described.
4 PM LONDON, Wednesday 19th September 2020
A guide to Earth, life, and terrestrial carbonates for the intergalactic sedimentologist…and some thoughts on why context matters…
Dr Alex Brasier – University of Aberdeen
[Abstract coming soon]
4 PM LONDON, Wednesday 23rd September 2020
Limestones: an essential user guide to sediments that dissolve, precipitate and grow
Professor Cathy Hollis – University of Manchester
Carbonate sedimentary rocks form through the accumulation of organisms and chemically precipitated calcium carbonate, usually on the sea floor. They preserve fragments of marine organisms, which are sensitive to temperature, salinity and seawater chemistry during their growth, and they therefore provide an exceptional record of evolutionary and climatic change through Earth’s history. Carbonate sediments are also highly reactive, dissolving and precipitating in surface water. For these reasons, despite their simple mineralogy, they have a reputation for being difficult to understand and many clastic sedimentologists approach them with caution! Nevertheless, carbonate sedimentary rocks are important for many reasons. They have been exploited for millenia for their minerals, water resources and, more recently, for cement, roadstone and hydrocarbon. Now, as we face the effects of climate change, we can use carbonate strata to understand how Earth responds to environmental stress and use this knowledge to better predict the effect of climate change on modern ecosystems. There is also growing interest in how carbonate sedimentary rocks can be used to good effect for carbon storage and geothermal heat production. This talk will provide an introduction to ‘novices’ of carbonate sedimentology to the principle processes that govern their formation and modification during lithification. It will illustrate their importance to our modern landscape and heritage and demonstrate how ancient carbonate systems can hold warnings, and solutions, to the effects of anthropogenic environmental impact.
9 AM LONDON Wednesday 30th September 2020
Building big bioherms from humble Halimeda: insights from a modern analogue
Dr Mardi McNeil – Queensland University of Technology
The Halimeda algal bioherms of the Great Barrier Reef, Australia represent the largest living, actively accumulating Halimeda deposits worldwide. Following the Holocene post-glacial marine transgression, these bioherms kicked off the outer-shelf carbonate factory some 2000 years earlier than the nearby coral reefs. Recent multi-disciplinary work has revealed new insights into their surface geomorphology, subsurface architecture and depositional environment that may be of interest to those working on their fossil counterparts.
4 PM LONDON Wednesday 7th October 2020
Magnitude and drivers of short term Cretaceous sea level fluctuations – a review
Frans van Buchem & Andy Davies – Halliburton – Landmark
Based on a recent review of the literature a data base of absolute values of short term (<3my) Cretaceous sea level rises and falls has been created. This shows an overall amplitude range of 5 to >65m, organised in four broad trends. The potential of aquifer eustasy has been investigated using climate modelling which showed a maximum impact of 5 to 10 meters. This leaves Glacio-eustasy as the key driver for short term high magnitude sea level changes in the Cretaceous.
4 PM LONDON Wednesday 14th October 2020
Microplastics in sedimentary systems. What we know and don’t know about this new type of sediment particle
Florian Pohl – Durham University
The threat posed by plastic pollution to ecosystems and human health is under increasing scrutiny and the amount of mismanaged plastic waste entering the environment is growing at a staggering rate. In particular microplastics (plastic particles <1 mm in size) have been discovered in every sedimentary system on the planet and thus became a new type of sediment particle. As such, sedimentology represents an important and powerful tool to understand and predict the transport, dispersal, and ultimate fate of microplastics in different environments. However, due to the complex shapes and low densities the transport and sedimentation behavior of this new sediment particle may differ significantly from those of natural sediments. The presence of microplastics in the environments poses new challenges for the field of sedimentology, but may also provide opportunities to better understand the dynamics of sedimentary systems. In this talk I will provide an overview on global plastic-pollution, microplastic as a new and unique sediment particle, and on microplastics in seafloor sediments.
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).
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!