古新世—始新世极热事件时期轨道尺度海洋脱氧的时空演化  

Orbital-Scale Spatiotemporal Dynamics of Ocean Deoxygenation During Paleocene-Eocene Thermal Maximum

作　　者：李明松 姚炜琪 沈俊[3] 黄元耕 杨义 LI Mingsong;YAO Weiqi;SHEN Jun;HUANG Yuangeng;YANG Yi(Key Laboratory of Orogenic Belts and Crustal Evolution,MOE,School of Earth and Space Sciences,Peking University,Beijing 100871;Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen 518055;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430078;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430078;College of Marine Science and Technology,China University of Geosciences,Wuhan 430074)

机构地区：[1]北京大学地球与空间科学学院,造山带与地壳演化教育部重点实验室,北京100871 [2]南方科技大学海洋科学与工程系,深圳518055 [3]中国地质大学(武汉)地质过程与矿产资源国家重点实验室,武汉430078 [4]中国地质大学(武汉)生物地质与环境地质国家重点实验室,武汉430078 [5]中国地质大学(武汉)海洋学院,武汉430074

出　　处：《中国基础科学》2024年第3期24-30,共7页China Basic Science

基　　金：国家重点研发计划青年科学家项目(2022YFF0802900)。

摘　　要：古新世—始新世极热事件(PETM)时期发生了快速的巨量碳排放、海洋脱氧和底栖有孔虫绝灭事件,被认为是科学认识当今全球变化最好的参考案例之一。由于缺乏高分辨率年代地层格架、有效的海洋脱氧定量表征方法和全球尺度地球系统模型,PETM时期海洋脱氧的速率、规模和空间分布存在很大的不确定性,其成因机制也存在争议。聚焦PETM时期海洋脱氧的时空演化规律,从建立PETM时期轨道尺度的地质时间轴、查明海洋脱氧的高分辨率时空演化历史、揭示海洋脱氧的触发机制与敏感度3个维度进行重点阐述。该研究有助于增强当今全球气候变暖背景下对海洋脱氧进程的速率、敏感度和时空演化规律的理解与预测能力。The Paleocene-Eocene Thermal Maximum(PETM)is characterized by rapid and massive carbon emissions,ocean deoxygenation,and benthic foraminiferal extinction.It is considered a reference for modern climate change.Due to the lack of an objective high-resolution chronostratigraphic framework,effective approaches for quantifying ocean deoxygenation,and precise globalscale Earth system reconstructions,there is a significant uncertainty regarding the rate,magnitude,and spatial distribution of ocean deoxygenation during the PETM,as well as its underlying mechanisms.Therefore,at the forefront of Earth system science,research on the spatiotemporal evolution of ocean deoxygenation during the PETM requires three closely related investigations:providing an orbital-scale geological timeline for the reconstruction of ocean deoxygenation;determining the high-resolution spatiotemporal evolutionary history of ocean deoxygenation events;uncovering the triggering mechanisms and sensitivity of ocean deoxygenation.The in-depth exploration of this paper will enhance the understanding and predictive capability regarding the rate,sensitivity,and spatiotemporal evolution of ocean deoxygenation in the context of ongoing global warming.

关 键 词：古新世—始新世极热事件 海洋脱氧 天文年代学 古氧相 古生产力 触发机制 

分 类 号：P597[天文地球—地球化学]