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

白垩纪-古近纪南大洋的碳气候扰动：来自 IODP 392 厄加勒斯高原的线索

• 批准号: NE/W00769X/1
• 负责人: Thomas Wagner
• 金额: $ 3.7万
• 依托单位: Heriot-Watt University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FW00769X%2F1
• 关键词: Carbon; climate; perturbations; Cretaceous; Paleogene

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.

IODP Expedition 392开始前往南非附近的Aguhlas Plateau，以从白垩纪 - 果仁元温室中恢复新的科学核心，并过渡到最近较冷的气候历史。该历史在温度和碳循环中富含脉冲扰动，其中一些是全球性的，并转化为黑色页岩沉积，而其他循环则更加微妙，与增强的碳埋葬无关。记录和了解这些扰动的起搏，振幅和原因及其在新兴的海洋中深而浅海环境中的边界状况，南方海洋早期为该研究项目设定了更广泛的界限。该项目将在探险途中进行最初的有机地球化学研究。该项目利用从巡航过程中回收的新核心的船板筛选材料，将集中于从低碳系统到扰动，高潮和恢复的过渡，从而记录了碳埋葬，营养循环和温度发展的相位，速率和幅度（初步关注海面调频的焦点，SST）。感兴趣的重要例子是白垩纪晚期的海洋性缺氧事件（OAE）以及最高白垩纪和古近纪期间记录的主要和小热点的黑色页岩。该项目涵盖了在美国大学城的IODP存储库设施举行的重要后灌木后社论和抽样会议。预计这次会议将为国际研究团队提供的更大的研究建议奠定基础。

项目成果

Expedition 392 Preliminary Report: Agulhas Plateau Cretaceous Climate

• DOI: 10.14379/iodp.pr.392.2022
• 发表时间: 2022-09
• 期刊: International Ocean Discovery Program Preliminary Report
• 作者: G. Uenzelmann‐Neben;S. Bohaty;L. Childress

EVOLUTIONARY LINEAGES OF ALKENONES RECORDED IN CRETACEOUS AND PALEOCENE SEDIMENTS FROM THE TRANSKEI BASIN (IODP SITE U1581)

特兰斯凯盆地白垩纪和古新世沉积物中记录的烯酮进化谱系（IODP 站点 U1581）

• DOI: 10.7185/gold2023.20482
• 发表时间: 2023
• 作者: Brassell S