澳大利亚科廷大学Christopher J. Spencer研究员学术报告

地球系统科学论坛第676期

应304am永利集团官网王伟教授邀请，澳大利亚Curtin University地球与行星科学学院Christopher J. Spencer 研究员来我校访问并做学术报告。

报告题目： Interplay between tectonics and atmosphere during the Archean-Proterozoic Transition

报告时间：2019年9月16日（周一）上午10:00

报告地点：主楼412

Christopher J. Spencer研究员简介：

Christopher J. Spencer研究员于2013年获得University of St Andrews博士学位，2013-2015年在英国地质调查局·NERC同位素地球科学实验室完成博士后研究，2015年至今在科廷大学担任高级研究员。他擅长于通过地学大数据统计分析研究当前地球科学的前沿热点问题，包括超大陆循环，大陆地壳增生、破坏、保存机制，古元古代大氧化事件， 锆石U-Pb年龄统计学解译等方面。截止目前，Chris Spencer以第一作者在Nature Geoscience , Geology, Earth-Science Reviews, GRL, GCA等国际著名地学期刊上发表论文数23篇，被引1200多次，H-index 21。

报告内容简介：

The Archean–Proterozoic transition records major geochemical changes. While the cause of isotopic shifts during this period have long been ascribed to atmospheric, biologic, and geologic processes, the influence of plate tectonics remains unknown. An appraisal of the global geologic record from about 2.3 to 2.2 billion years ago demonstrates a tectonomagmatic lull when global-scale continental magmatism (plume and arc magmatism) decreased and relative plate motions were subdued. Additionally, the age of large igneous provinces reveals a step-change in the proportion of subaerial eruptions at ~2.4 Ga implying a rapid development of continental freeboard at this time. A precipitous rise in atmospheric oxygen at about 2.3 Ga has been implied to be driven by the evolution of oxygenic photosynthesis. While the geochemical proxies of atmospheric oxygenation is recorded at the atmosphere-lithosphere or atmosphere-ocean interface, how it may have affected the deeper lithosphere is more cryptic. In this seminar, I will discuss some of the advances of my research program that explores the interconnection of tectonic processes with atmospheric and biologic evolution.

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2019年9月