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远征392出发到南非附近的Aguhlas高原，从古近纪温室及其向最近更冷的气候历史的过渡中恢复新的科学岩心。这一历史在温度和碳循环中具有丰富的脉冲扰动，其中一些是全球性的，并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速度、幅度和原因，以及它们在新兴的早期南大洋的深海和浅海环境中的边界条件，为这个研究项目设定了更广泛的边界。这个项目将在考察暂停期间进行初步的有机地球化学研究。该项目将利用航行期间从新岩芯中提取的船上筛选材料，重点关注从低碳系统向扰动、高潮和恢复的过渡，从而记录碳埋藏、养分循环和温度变化的阶段、速率和幅度（最初重点关注海表温度）。值得关注的突出例子是来自晚白垩世海洋缺氧事件（OAE）的黑色页岩，以及白垩纪和古近纪最上部记录的主要和次要高温。该项目包括在美国学院站的IODP处置库设施举行的重要的巡航后编辑和取样会议。预计这次会议将为国际研究小组提出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