T05 - Stratigraphic archives of evolution of climate, oceans, and biota

T05-SS01 - Paleozoic ocean, lands, ecosystems and climate imprinted in sedimentary strata: New insights from high-resolution proxies

Conveners: Kabanov P. (Geological Survey of Canada, NRCan, Canada), da Silva A. Ch. (Université du Liége, Belgium)

The sedimentary record unveils a lot of previously unknown due to instrumental innovations augmenting conventional observations to ever increasing degree. Elemental and isotope geochemistry, magnetic susceptibility are just a few out of many groups of methods enhancing our capacity to read signals coded in sedimentary strata, and advancing geochronology is paving the way to globewide synchronization of events and cyclic sedimentary processes of the Past. Palaeozoic stratal archive still bears a lot of knowledge gaps and controversies. The need to better understand Palaeozoic strata emerges not only from their economic value (e.g., major hydrocarbon and salt resources), but they also imprint icehouse-greenhouse transitions and prominent events of biotic crises and rapid climate change. This session is open to research of Palaeozoic sedimentary strata in all forms: marine and non-marine sediments, cyclic stratal successions of various expressions, stratigraphic unconformities and paleosols, the widest range of conventional observations, petrography, instrumental proxies, and modelling as applied to better understanding of the dynamics of oceans, seas, lands, and climates of the deep Past. This session equally welcomes talks on biotic imprints in Palaeozoic sediments.

T05-SS02 - Climatic, environmental, and biotic crises of the Permo- Triassic: Sedimentary records of the transition to the Mesozoic world

Conveners: Frank T. (University of Nebraska–Lincoln, USA), Fielding Ch. (University of Nebraska–Lincoln, USA), Bourquin S. (French National Centre for Scientific Research, France)

The Permian and Triassic periods witnessed Earth’s penultimate icehouse, the development of extreme hothouse conditions, and the largest extinction event of the Phanerozoic. The late Paleozoic Icehouse was the longest and most intense glaciation of the Phanerozoic, with atmospheric composition that encompassed both the lowest carbon dioxide and highest oxygen levels of the Phanerozoic. Fundamental shifts in atmospheric circulation led to the development of a global megamonsoon. Arid tropical late Permian environments in America were balanced by environments elsewhere that supported extensive peat accumulation. The transition to the Triassic was marked by a complex ecological catastrophe, with volatile release from basaltic magma and sedimentary strata contributing to greenhouse gas-induced extreme global warming and widespread anoxia and acidification contributing to the extinction of about 96 percent of all species. In light of conditions comparable to those anticipated for Earth’s immediate future, there is an urgent need to assess this dynamic time period in a variety of settings and over a longer timeframe using integrated datasets. This session aims to explore the latest results of research on Permian and Triassic climate and environment in a range of marine and terrestrial settings.

T05-SS03 - Understanding a greenhouse Earth: Climate, sea level, ocean circulation and biogeochemical cycles in the Cretaceous

Conveners: Jarvis I. (Kingston University, UK), Plint A.G. (University of Western Ontario, Canada), Batenburg, S (Université Rennes, France), Uličný D. (Institute of Geophysics, Prague)

Intervals of geological history characterized by a greenhouse climate regime serve as a source of important data for understanding climatic processes in the past as well as in the near future. The Cretaceous Period was characterized by a greenhouse climate involving polar warmth, a Phanerozoic maximum in sea level, exotic thermohaline circulation patterns in oceans, and global perturbations of the carbon cycle expressed in oceanic anoxic events (OAEs). During the past two decades, evidence for short-term sea-level changes has fueled debate about controversial short-lived glacial episodes in this greenhouse world. Most recently, aquifer-eustasy or limno-eustasy are being increasingly invoked as possible drivers of greenhouse sea-level change. New and higher-resolution datasets and new modelling efforts (including use of GCMs) are needed in order to improve our understanding of relationships between the greenhouse climate, ocean behaviour, and global biogeochemical cycles, on time scales approaching those of younger sedimentary archives of the Cenozoic. This session aims to present current work on the above topics, focusing particularly on high-resolution and multi-disciplinary studies, integrating the approaches of sedimentology, palaeontology, mineralogy and geochemistry, sequence stratigraphy, chemo- and cyclostratigraphy, and numerical modelling.

T05-SS04 - Black shales: Past depositional systems and modern environments

Conveners: Gambacorta G. (Eni, Italy), Parente M. (University of Naples Federico II, Italy), Wignall P. (University of Leeds, UK)
Decades of research have clearly shown that is not always possible to apply uniformitarian principles to depositional models for black shales. Enhanced preservation in stratified landlocked or silled basins and enhanced productivity in coastal upwelling
zones represent two modern end-members that do not always capture the variety and complexity of processes that acted during peculiar time interval in Earth history. Consequently, ancient black shales represent unique and fundamental archives of peculiar processes not directly observable in modern environments. On the other hand, modern depositional settings offer a unique opportunity for directly observing and measuring the relative importance of sedimentary style, primary productivity, water-column and sediment anoxia in controlling the vertical and lateral distribution of organic carbon-rich sediments. The study of recent depositional models for ancient black shales and modern organic carbon-rich sediments is increasingly capturing the complexity and variability of processes involved in their deposition. However, further careful and multidisciplinary studies of ancient and modern records are needed to better understand the local and global factors that drove organic matter accumulation in the geological record. The aim of this session is to provide a representative review of the state of the art of black shale petrography, sedimentology and stratigraphy. Contributions to this session should reflect the current views of black shale deposition and environments from modern and past continental and marine sedimentary records.

T05-SS05 - Sedimentary environments as the theatres of life and evolution

Conveners: Shillito A. (University of Oxford, UK), Davies N. (University of Cambridge, UK), McMahon W. (Utrecht University, Netherlands), Stephen Rice (Loughborough University, UK)
The sedimentary record provides an archive of ancient environments, intrinsic to which were organisms that evolved and adapted throughout Earth history. Life and environment have co-evolved throughout geological time, as organisms have sculpted and influenced physical landforms, bedforms and sedimentary processes. The objectives of this session are (1) to recognise what information of major Earth-historical evolutionary innovations and extinction events is archived within the ancient sedimentary record; (2) to unravel sedimentary clues pertaining to the influence of physical environments on ancient organisms; and (3) to improve understanding of how the fossil record and physical sedimentary record co-evolved as the biosphere became an increasingly significant component of the geosphere. Contributions are welcome from work at all scales of these objectives, from fields including ichnology, sedimentary geology, geochemistry, geomorphology, and palaeoecology, in both marine and non-marine settings.

T05-SS06 Continent-ocean interactions and their geological records: A tribute to Karl Föllmi

Conveners: Adatte T. (Lausanne University, Switzerland), Bomou B. (Lausanne University, Switzerland), Bodin S. (Arrhus University, Denmark), Fantasia A. (Arrhus University, Denmark), Van de Schootbrugge B. (Utrecht University, Netherlands)

With the recent passing of Karl Föllmi, sedimentology and Earth Science in general lost a scientist of international reputation. This session will be focused on continent-ocean interactions and their geological records, in particular in Mesozoic shallow water carbonates, one of the favourite research topics of Karl Föllmi.
© 2019–2020 GUARANT International spol. s r. o.