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

海洋学和气候变化以及希克苏鲁伯对白垩纪-古近纪 (K-P) 边界的影响 ODP Leg 207，德梅拉拉隆起，西大西洋

• 批准号: 28833061
• 负责人: Dr. Peter Schulte
• 金额: --
• 依托单位: Forschungsschwerpunkt Krustendynamik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/28833061?language=en
• 关键词: Oceanographic; climate; changes; Chicxulub; impact

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.

从白垩纪到古近纪（约65 Ma前）的过渡与显著的环境变化有关，包括全球气候波动，主要的海平面变化和洪水玄武岩火山活动，以及与希克苏鲁布撞击事件和全球生物大灭绝在白垩纪-古近纪（K-P）边界。为了理解这些相互关联的过程和事件，该项目旨在根据最近K-P研究的结果，通过多学科方法破译K-P边界延长间隔期间的古气候和古海洋变化。位于西大西洋Demerara隆起的ODP 207航次，其在三个钻井点获得的扩展且地层完整的K-P层段，在了解低纬度K-P深水记录中的K-P边界层段方面占据了中心位置。一个跨学科的地球化学，矿物学和岩石磁性方法的组合将被应用于（i）实现连续的<$18 O和<$13 C化学地层学用于估计温度和环境扰动，（ii）通过矿物学和岩石磁性代用指标提供对古气候和古海洋学变化的约束，以及（iii）表征撞击喷出物层及其与在其它K-P边界层中发现的希克苏鲁布喷出物的相关性。