报告题目：Reconstructing Earth’s Ancient Phosphorus Cycle（深时地球磷循环的重建）

报告人：Simon Poulton 讲席教授，英国利兹大学

报告时间：2024年3月14日（星期四）14:30-16:00

报告地点：西康路1号河海大学科学会堂102室 

主持人：何天辰  教授

报告人简介：

Simon Poulton，英国利兹大学地球与环境学院讲席教授，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，入选2023年度中国科学院国际人才计划（PIFI）。他长期致力于研究现代和深时地球表层生物地球化学、海洋营养元素循环以及地球演化历史中大气和海洋环境演变规律等问题，通过极具独创性的沉积地球化学方法和地球系统模拟手段揭示环境与生命协同变化的规律，并取得引领性成果。发表论文一百余篇，包括Nature、Science、Nature Geoscience、Nature Communications、Science Advances等高水平期刊论文数十篇，被引18000余次。

报告摘要：

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 sulfate 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.