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Environmental changes and global recovery of primary producers after the Cretaceous/Paleogene boundary (KPgB): A molecular fossil approach

Projektbeschreibung

Erforschung des letzten der fünf großen Massenaussterben

Das letzte große Massenaussterben geschah vor mehr als 60 Millionen Jahren an der Kreide-Paläogen-Grenze. Dieses letzte der „großen Fünf“ ereignete sich im Phanerozoikum (unserem heutigen geologischen Zeitalter, das vor etwa 541 Millionen Jahren begann). Das EU-finanzierte Projekt EPROAMA wird die kurz- bis langfristigen Auswirkungen dieses Ereignisses auf das globale Umweltsystem aufklären, einschließlich der Wiederherstellung der vor dem Aussterben herrschenden Umweltbedingungen und der biologischen Produktivität des Meeres. Wie haben sich beispielsweise die Primärproduktivität und die biologische Pumpe verändert und wie haben sich diese Veränderungen auf die Quelle und die Beschaffenheit der organischen Stoffe ausgewirkt, die den Meeresboden erreichen? Das Projekt wird außerdem der Frage nachgehen, wie sich diese miteinander verknüpften Prozesse nach dem Massenaussterben wieder eingepegelt haben.

Ziel

The mass extinction marking the Cretaceous/Palaeogene boundary (KPgB), 66.02 million years ago. It was one of the most devastating events in the history of life, as well as the most recent and best studied of the ‘big five’ mass extinctions that occurred during the Phanerozoic. After decades of research, one of the most critical lines of inquiry is understanding the short- to long-term effects of this impact on the global environmental system, including the re-establishment of pre-impact environmental conditions and marine biological productivity. After characterizing how the recovery of palaeoenvironmental conditions were by the analysis of inorganic geochemical proxies, critical questions were raised about the nature of and recovery after the event. how did primary productivity and the biological pump change and how did that impact the source and character of organic matter reaching the seafloor? And crucially, how did these interlinked processes recover after the impact event? The Caravaca section is amongst the most continuous, well-preserved, and well-studied KPgB distal sections in the world. This allows these questions to be explored using molecular fossils (or biomarkers) – for the first time in this section and consequently at unprecedented stratigraphic resolution. The approach will broadly encompass several methods, all of which will be carried out in the OGU (Organic Geochemistry Unit) at Bristol University. These will include but are not limited to, the determination of total organic carbon (TOC) contents; the extract and analysis of the biomarkers from ground samples; the determination of key biomarker abundances and distributions by GC and GC-MS in order to ascertain changes in organic matter (OM) source, algal assemblages, terrestrial biomarkers, redox state (pristane/phytane ratio; homohopane index) and microbial inputs (hopanes); and finally, to explore changes in ‘apparent thermal maturity’ which could reflect changes in reoworked OM input.

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Koordinator

UNIVERSITY OF BRISTOL
Netto-EU-Beitrag
€ 224 933,76
Adresse
Beacon house queens road
BS8 1QU Bristol
Vereinigtes Königreich

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Region
South West (England) Gloucestershire, Wiltshire and Bristol/Bath area Bristol, City of
Aktivitätstyp
Higher or Secondary Education Establishments
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