Oceanographic and climate changes and the Chicxulub impact at the Cretaceous-Paleogene (K-P) boundary ODP Leg 207, Demerara Rise, Western Atlantic

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The transition from the Cretaceous to the Paleogene (about 65 Ma ago) is associated with prominent environmental changes, including global climate fluctuations, major sea-level changes, and flood basalt volcanism, as well as with the Chicxulub impact event and the global mass extinction at the Cretaceous-Paleogene (K-P) boundary. To understand these mutually interrelated processes and events, this project aims to decipher paleoclimatic and paleoceanographic changes during an extended interval across the K-P boundary by a multidisciplinary approach in the light of results from recent K-P research. The ODP Leg 207 from the Demerara Rise, western Atlantic ¿ with its expanded and stratigraphically complete K-P interval recovered at three drill sites ¿ occupies a central position for understanding the K-P boundary interval for the ¿ so far not well documented K-P deepwater record from low latitudes. An interdisciplinary combination of geochemical, mineralogical, and rock-magnetic methods will be applied for (i) achieving a continuous ¿18O and ¿13C chemostratigraphy for estimating temperatures and environmental disturbances, (ii) providing constrains on paleoclimate and paleoceanographic changes by mineralogical and rock-magnetic proxies, and (iii) characterizing the impact ejecta layer and its correlation to the Chicxulub ejecta found in other the K-P boundary layers.