Lyons, T.
; Turchyn, A.
; Reinhard, C.
(Ed.)
How oxygen levels in Earth’s atmosphere and oceans evolved has
always been a central question in Earth System Science. Researchers
have developed numerous tracers to tackle this question, utilizing
geochemical characteristics of different elements. Iodine incorporated
in calcium carbonate (including biogenic) minerals, reported as I/Ca, is
a proxy for dissolved oxygen in seawater. Here we review the rationale
behind this proxy, its recent applications, and some potential future
research directions.
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