報告題目：Reconstructing Earth’s Ancient Phosphorus Cycle（深時地球磷循環的重建）
報告人：Simon Poulton 講席教授，英國利茲大學
報告時間：2024年3月14日（星期四）14:30-16:00
報告地點：西康路1号河海大學科學會堂102室
主持人：何天辰 教授
報告人簡介：
Simon Poulton，英國利茲大學地球與環境學院講席教授，歐洲地球化學學會會士、英國皇家學會沃爾夫森優秀科研獎（Royal Society Wolfson Research Merit Award）獲得者，入選2023年度中國科學院國際人才計劃（PIFI）。他長期緻力于研究現代和深時地球表層生物地球化學、海洋營養元素循環以及地球演化曆史中大氣和海洋環境演變規律等問題，通過極具獨創性的沉積地球化學方法和地球系統模拟手段揭示環境與生命協同變化的規律，并取得引領性成果。發表論文一百餘篇，包括Nature、Science、Nature Geoscience、Nature Communications、Science Advances等高水平期刊論文數十篇，被引18000餘次。
報告摘要：
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.
