HIGHLIGHTS
SUMMARY
Use of I/Ca in carbonates as a paleo tracer for ocean oxygen levels primarily depends on the iodate concentration in seawater; abiotic calcite synthesis experiments suggest that iodate is the preferred iodine species taken up into calcite, and that the amount incorporated reflects concentrations in seawater (Lu et_al, 2010; Zhang et_al, 2013). Frontiers in Marine Science frontiersin.org 10.3389/fmars.2023.1095570 extensive OMZ show consistently low I/Ca and amp;lt;2.5 μmol/mol for both mixed layer species and deeper dwellers (Lu et_al, 2016a; Hoogakker et_al, 2018; Lu et_al . . .
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