Iodine is a redox-sensitive element and its abundance in sedimentary rocks and foraminifera is used as a paleoredox proxy. This includes redox transitions on scales varying from the Great Oxidation Event in the Precambrian to Pleistocene glacial-interglacial cycles. However, ancient applications and a modern understanding of dissolved iodine distribution are ultimately limited by a scarcity of empirical rates and an incomplete understanding of the mechanisms driving iodine oxidation and reduction in seawater today. In this talk, I will trace iodine cycling from seawater to sediments, including insights from oxygen minimum zones, laboratory and shipboard radioisotope (iodine-129) tracer experiments, diagenetic environments, and modeling into the controls on the distribution of iodine speciation in the ocean today. We will overview the implications for iodine and related elemental cycles as well as the redox state of ancient oceans across key events in Earth history.

Those wishing to attend remotely should log in to Zoom ID#989 8458 7392

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