Carbon-climate perturbations in the Cretaceous-Paleogene Southern Ocean: Clues from IODP 392 Agulhas Plateau

IODP 392探险队出发前往南非附近的Aguhlas高原，从白垩纪-古近纪温室中恢复新的科学核心，并将其过渡到更近更冷的气候历史。这段历史充满了温度和碳循环的脉冲扰动，其中一些是全球性的，转化为黑色页岩沉积，而另一些则更为微妙，与增强的碳埋藏无关。记录和了解这些扰动的步调、幅度和原因，以及它们在新兴的早期南大洋的深浅海洋环境中的边界条件，为这一研究项目设定了更广泛的边界。该项目将在探险暂停期间进行初步的有机地球化学研究。使用巡航期间回收的新岩芯的船上筛选材料，该项目将侧重于从低碳系统向扰动、高潮和恢复的过渡，从而记录碳埋、营养循环和温度发展的阶段、速率和幅度(最初的重点是海表面温度)。引人注目的例子是晚白垩世大洋缺氧事件(OAEs)的黑色页岩，以及白垩纪最晚期和古近纪记录的主要和次要的热液。该项目包括在美国大学站IODP储存库设施举行的重要的邮轮后编辑和抽样会议。预计这次会议将为国际研究团队提出更大规模的研究提案奠定基础。

IODP Expedition 392 sets out to Aguhlas Plateau off South Africa to recover new scientific cores from the Cretaceous-Paleogene greenhouse and its transition to the more recent colder climate history. This history is rich in pulsed perturbations in temperature and carbon cycling, some of which are global and translated into black shale deposition, whereas others are more subtle and not associated with enhanced carbon burial. Documenting and understanding the pacing, amplitudes and causes of these perturbations and their boundary conditions at deep and shallow marine settings in the emerging, early Southern Ocean sets the wider boundaries for this research project.This project will conduct initial organic geochemical research during the moratorium period of the expedition. Using shipboard screening material from the new cores recovered during the cruise, the project will focus on the transition from low carbon systems into perturbations, climax, and recovery, thereby documenting the phasing, rates and amplitudes in carbon burial, nutrient cycling and temperature development (initial focus on sea surface temperatures, SST). Prominent examples of interest are black shale from the late Cretaceous Oceanic Anoxic Events (OAEs) and major and minor hyperthermals recorded during the uppermost Cretaceous and Paleogene. The project covers the important post-cruise editorial and sampling meeting at the IODP repository facilities in College Station, USA. It is anticipated that this meeting will set the foundation for larger research proposals delivered by international research teams.