Iodine cycling and implications for ancient seawater redox evolution

19. März 2024, von Tom Jaeppinen

Am 19. März 14:00 Uhr, Raum 1129 wird Prof. Dr. Dalton Hardisty (https://www.msuhardistylab.com) von der Michigan State University am Institut für Geologie zu Gast sein und einen Vortrag mit dem folgenden Titel halten: "Iodine cycling and implications for ancient seawater redox evolution“.

Abstract

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 an incomplete understanding of the mechanisms driving iodine cycling pathways 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. 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.