Sessions > RTS4 Reading Time in Sedimentology
SYMPOSIUM RTS4 - READING TIME IN SEDIMENTS
Description. This theme gathers sessions illustrating the various approaches and disciplines allowing determining the age of sedimentary rocks, chronology and durations of events using paleontological, mineralogical, and chemical data, facies contents, rock physical properties, and sequence and cyclic stratigraphy. The theme also aims to attract studies dealing with the construction of chronostratigraphic scales. Integrated and innovative approaches will be particularly appreciated.
Description. This open session invites contributions on the general topics related to Reading Time in Sediments. It is an opportunity to present studies that do not fall within research covered by the special sessions RTS4.1 to RTS4.4.
Description. Biogenic structures produced by living organisms have proven to be exceptionally valuable for paleoenvironmental reconstructions and stratigraphic analyses. Most studies of trace fossils focus on the marine realm, whereas scant attention has been on trace fossils in the continental domain.
This session is interested in the description, classification, interpretation, and/or application of trace fossils preserved in continental or marginal marine settings (e.g., lacustrine, fluvial, eolian, soils, deltaic, estuarine). All studies including trace fossils in the geological record, modern environments, lab experiments, or imaging techniques are most welcome.
Description. Biostratigraphy is the historical and primary standard tool to correlate and assign relative ages to rock strata. The widespread use of other techniques (chemostratigraphy, magnetostratigraphy, high-precision radiometric dating and cyclostratigraphy), and the need for integrated stratigraphy have sometimes highlighted the existence of diachronism of bio-events. Numerous examples of diachronous bio-events are documented in the paleontological record but rarely constitute the focus of research studies and/or remain controversial. The high-precision of the recent Geologic Time Scale obtained mostly from the great precision of new radiometric dating and through astronomical calibration calls for a more thorough examination of the synchronicity of bio-events. Rather than being regarded as pitfalls, examples of diachronism should be considered as tools with a great potential for paleoceanography as they are often associated with important changes in the paleobiogeographic distribution of taxa which are triggered by changes in ocean currents, climate, continent configuration and/or sea-level.
The purpose of this session is to welcome presentations that focus on diachronism of bio-events in the geological record with the aspiration to diffuse such examples more widely in the geological community as we believe that this topic is one of the critical issues for the next generation of Geologic Time Scales.
Conveners. Matthias SINNESAEL (Vrije Universiteit Brussel, BEL), Luis VALERO (Universitat Autònoma de Barcelona, ESP), Elise NARDIN (CNRS GET, FRA), Anne-Christine da SILVA (Universities of Liège and Utrecht, BEL/DNK)
Description. Cyclostratigraphy is a powerful chronometer, based on the detection of the Milankovitch cycles (obliquity, precession and eccentricity) in the sedimentary record. Those cycles result from periodic variations in the Earth-Sun system, affecting the distribution of solar energy over the Planet influencing Earth’s climate on time scales between 104 and 106 years. Cyclostratigraphy also allows to shed new light on the past climatic system and to better understand the interaction between the climatic system and global biotic or geochemical events.
This session is open to cyclostratigraphic related research in all its forms: methodological work, modelling and stratigraphic case-studies. Equally appreciated are contributions related to a wide-range of paleoclimatic studies on astronomical climate forcing.
Conveners. Eric CHAUMILLON (University of La Rochelle, FRA), Fabien ARNAUD (University of Savoie Chambery, FRA), Brice MOURIER (Ecole nationale de travaux Publics de l’Etat Vaulx en Velin, FRA), Catherine JEANDEL (CNRS - LEGOS, FRA), Blas Valero-Garces (University of Zaragossa, ESP)
Description. The onset of the concept of Anthropocene has been presented as a rising challenge for geosciences which are now urged to integrate Humans as an active geological agent in their way of depicting and understanding processes at the surface of Planet Earth. Whereas taking account of human-triggered forcing factors is not really new for sedimentologists, their contribution is now challenged to address environmental issues.
In that session we welcome sedimentological study in which humans are considered as forcing factors. This could involve, for instance and non-exclusively, sediment-based reconstructions, present-day marine and continental processes studies, sediment contamination and contribution on the definition of the Anthropocene stratigraphic and chronological status.
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