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

IODP 392考察队前往南非的Aguhlas高原，从白垩纪-古近纪温室及其向更近的寒冷气候历史的过渡中恢复新的科学核心。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，而另一些则更微妙，与碳埋藏增强无关。记录和理解这些扰动的速度、幅度和原因，以及它们在新兴的早期南大洋深海和浅海环境下的边界条件，为本研究项目设定了更广泛的边界。本项目将在考察暂停期间进行初步的有机地球化学研究。利用在巡航期间回收的新岩心的船上筛选材料，该项目将重点关注从低碳系统到扰动、顶极和恢复的过渡，从而记录碳埋藏、营养循环和温度发展的阶段、速率和幅度（最初关注海面温度，SST）。突出的例子是来自晚白垩纪海洋缺氧事件（oae）的黑色页岩，以及记录在上白垩纪和古近纪的主要和次要热液。该项目包括在美国大学城IODP储存库设施举行的重要的巡航后编辑和采样会议。预计这次会议将为国际研究团队提出更大的研究建议奠定基础。

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.