讲座1：Reconstructing Earth's Ancient Phosphorus Cycle
讲座2：Phosphorus Controls on Earth's Early Oxygenation History
报告人：Simon Poulton 教授
报告人单位：英国利兹大学
报告时间：3月12日（周二），14:30
3月13日（周三），14:30
报告地点：南京古生物所图书馆三楼报告厅
主 办：重点实验室、科技处、人教处
报告人简介：
Simon Poulton，英国利兹大学教授，欧洲地球化学学会会士、英国皇家学会沃尔夫森优秀科研奖（Royal Society Wolfson Research Merit Award）获得者。他长期致力于地球生物圈化学演化、营养元素循环以及地球早期大气和海洋环境演变规律等问题的研究，通过沉积岩的地球化学及非传统同位素等极具独创性的手段揭示早期环境与生命协同变化规律，并取得重要成果。发表论文一百余篇，包括Nature、Science、Nature Geoscience、Nature Communications、Science Advances等期刊论文数十篇，SCI引用18000余次。获得2023年中国科学院国际人才计划（PIFI）资助。
报告摘要：
Seminar 1: Reconstructing Earth’s Ancient Phosphorus Cycle
Our understanding of Earth’s oxygenation/deoxygenation history and links to biological evolution and extinction has evolved dramatically over recent years. While there is still much to learn in terms of reconstructing the dynamics of this history, with a broad understanding in place, attention is increasingly focusing on the drivers of intervals of paleoenvironmental change. In this regard, the key major limiting nutrient, phosphorus, plays a key role through its regulation of primary productivity, organic matter production and burial, and hence both regional water column deoxygenation and global oxygenation. However, our understanding of the ancient phosphorus cycle is highly limited, and hence controls on major periods of paleoenvironmental change are often obscured. Here, we will investigate phosphorus cycling in modern redox-sensitive environments, with a focus on ferruginous (Fe-containing) and low ··1= euxinic (sulfidic) water column settings that are analogous to ancient oceans. With this new understanding, we will then explore how new techniques for evaluating the phase partitioning of phosphorus can be used to unravel phosphorus cycling in ancient environments, with a particular focus on the Late Ordovician mass extinction and global ferruginous conditions in the early Neoproterozoic.
Seminar 2: Phosphorus Controls on Earth’s Early Oxygenation History
Over the last 20 years, huge progress has been made in terms of our understanding of Earth's oxygenation history. This lecture will start with a general overview and timeline of the advances made, culminating in the most up-to-date reconstruction of atmospheric and oceanic oxygenation. Recent research will then be presented on the role that phosphorus cycling played in priming the Earth for its first major rise in atmospheric oxygen during the Great Oxidation Episode (GOE). Research pertaining to the dynamics of the GOE and links to phosphorus cycling will then be discussed. This work documents a major delay of ~100 million years in the timing of persistent atmospheric oxygenation, with intense fluctuations in atmospheric oxygen levels being linked to major climate perturbations. Finally, we will review how far our understanding of the history of mid-Proterozoic ocean chemistry has evolved over the last 20 years, with an ultimate focus on potential drivers of apparent temporal and spatial variability in this record.
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