Conference Agenda
Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
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Session Overview |
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2.3-2 Proxy applications in restricted basins
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by Iuliana Vasiliev-Popa1, Wout Krigsman2 1: Senckenberg Biodiversity abd Climate Research Centre, Germany; 2: Earth Sciences, Utrecht University, The Netherlands During the Miocene the Mediterranean-Paratethys system experienced, at times, severe disruption of connectivity to the ocean, limiting the possibility for strait forward correlation of conventional proxy data (e.g. δ13C & δ18O stable isotopes) to the oceanic record. It is, however, important to understand the paleoenvironmental changes affecting this highly-dynamic Mediterranean-Paratethys system, especially at times of almost complete separation from the Open Ocean like during the times of Badenian and Messinian Salinity Crises, two events that shaped the Eurasian paleoclimate. This session is intended to bring together all-type proxies specialists working in the Mediterranean-Paratethys domain with the target to obtain an integrated understanding of the potential in using novel geochemical proxies to reconstruct parameters like anoxia, sea surface temperature, salinity, mean annual air temperature, all influenced by the size of the gateways and the connectivity to the Ocean. These geochemical proxies are intended to be paralleled to the more established proxy data provided by palaeontology and palynology to understand and cross-evaluate the limitations of proxies in restricted basins. We also encourage contributions where the proxy records are used and compare to modelling experiments for achieving a holistic understanding of changed affecting highly restricted basins. | ||||
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3:20pm - 3:35pm
ID: 274 Virtual Presentation The birth of a connected South Atlantic Ocean: a paleomagnetic perspective 1Oceanographic Institute of the University of Sao Paulo,; 2Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, The early Paleogene sedimentary record of the Sao Paulo Plateau holds the key to understanding the timing and mechanisms of the onset of Atlantic oceanic circulation, with implications for ocean - climate feedback systems. The timing and evolution of South Atlantic Ocean connectivity remain poorly understood, hindering a full understanding of modern circulation mechanisms. In this work, we develop an improved magnetostratigraphic age model for the late- Cretaceous Eocene sedimentary record of Deep-Sea Drilling Project (DSDP) Site 356, located on the Sao Paulo Plateau at the edge of the Rio Grande Rise. The model constrains the timing of the beginning of South Atlantic Ocean circulation, as the last obstacle to a connected Atlantic was overcome. We use the age model to quantify sedimentary rates, and correlate with rock magnetic and published geochemical data to explore links between ocean current rearrangement and climatic anomalies. We find that periods of sedimentary instability, characterized by anomalies of magnetic properties in the Sao Paulo Plateau are reflected in carbon isotope events and proposed hyperthermal events, supporting a link between ocean circulation and global climate.
3:35pm - 3:50pm
ID: 300 Virtual Presentation | ECS Middle Miocene Paleoclimate Reconstruction Based on the Macrofossil Flora of Yatağan-Tınaz Basin (Western Anatolia) 1Dept. Biology, Ege University, İzmir, Turkey; 2Institute of Marine Science and Technology, Dokuz Eylül University, İzmir, Turkey In Western Anatolia, due to tectonic features, the sedimentary deposits are formed in lacustrine depositional setting and most of these sediments contain lignites. This study is based on a detailed paleobotanical investigation of middle Miocene aged Yatağan-Tınaz coal mining area in Muğla city(Turkey). The coalbearing sediments of the Yatağan Basin are rich in well-preserved leaf fossils and microfossils. Macro fossil samples were collected from the Sekköy formation that contains the main coal seam at the bottom and marls in the upper parts. The aim of this study is to illustrate the Miocene vegetation and the paleoclimate of Tınaz Basin. The palaeovegetation types were determined based on IPR (integrated plant record). Characteristics of the palaeoclimate was determined by using the coexistence approach (CA) method employing Climstat software. According to the macro floral studies and IPR analysis, during the middle Miocene, the Tınaz basin enjoyed a temperate zone climate that forested temperate broadleaf deciduous forests. An analysis of the Climstat program results of identified macro fossil specimens from Sekköy formation also showed that a temperate climate was dominant and seasonality existed during that time. We suggest that during the middle Miocene river-fed marshes and riparian forests thrived in the Tınaz Basin while broadleaf deciduous forest was present in the surroundings of the basin. Furthermore, the macro flora of the basin reflects humid temperate climate conditions.
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