报告题目：The chemical index of alteration (CIA) and evaluation of paleo-weathering intensity页岩化学风化指数与古陆风化强度评估

报告时间： 2026年6月18日下午16:00-18:00

报告地点：明辨楼D404

报告人： Prof. Thomas Algeo  （教授）

报告人单位：University of Cincinnati, USA

报告人简介：

Dr. Algeo completed his Ph.D. at the University of Michigan before joining the faculty of the University of Cincinnati. He specializes in development of elemental proxies for paleoenvironmental analysis, laying the foundation for the modern approach to reconstruction of redox, salinity, watermass restriction, and chemical weathering intensity in paleoenvironmental systems. He has studied all of the Big Five mass extinctions and is the author of a leading theory for the Late Devonian extinctions, linking them to the evolution and spread of vascular land plants. He is a fellow of the Geological Society of America and the Geochemical Society and a PIFI fellow of the Chinese Academy of Sciences.

报告内容简介：

The chemical index of alteration (CIA) has become a widely used geochemical proxy for evaluating weathering intensity in paleosols and transported sediments. Correct use of the CIA proxy requires an understanding of the underlying chemistry and mineralogy of soils and weathering processes. In this talk, Dr. Algeo will discuss fundamentals of chemical weathering and how they are related to the CIA proxy, whether corrections to CIA (e.g., for K-metasomatism) are warranted, and how to infer protolith composition, with many examples drawn from China and globally.

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       主办单位：                     天然气地质四川省重点实验室

能源矿产资源开发与利用国际联合研究中心

地球科学与技术学院

科学技术发展研究院