Carbonate I/Ca records through Phanerozoic, supplement to: Lu, Wanyi; Ridgwell, Andy; Thomas, Ellen; Hardisty, Dalton; Luo, Genming; Algeo, Thomas; Saltzman, Matthew R; Gill, Benjamin C; Shen, Yanan; Ling, Hong-Fei; Edwards, Cole T; Whalen, Michael T; Zhou, Xiaoli; Gutchess, Kristina M; Jin, Li; Rickaby, Rosalind E M; Jenkyns, Hugh C; Lyons, Timothy W; Lenton, Timothy M; Kump, Lee R; Lu, Zunli (accepted): Late inception of a resiliently oxygenated upper ocean. Science

Rising oceanic and atmospheric oxygen levels through time have been crucial to enhanced habitability of surface Earth environments. Few redox proxies can track secular variations in dissolved oxygen concentrations ([O~2~]) around threshold levels for metazoan survival in the upper ocean. We present an extensive compilation of iodine to calcium ratios (I/Ca) in marine carbonates. Our record supports a major rise in atmospheric _p_O~2~ at ~400 million years ago (Ma), and reveals a step-change in the oxygenation of the upper ocean to relatively sustainable near-modern conditions at ~200 Ma. An Earth system model demonstrates that a shift in organic matter remineralization to greater depths, which may have been due to increasing size and biomineralization of eukaryotic plankton, likely drove the I/Ca signals at ~200 Ma.

Metadata Access
Creator Zhou, Xiaoli;Gill, Benjamin C;Jin, Li;Rickaby, Rosalind E M;Saltzman, Matthew R;Jenkyns, Hugh C;Hardisty, Dalton;Lenton, Timothy M;Luo, Genming;Whalen, Michael T;Lyons, Timothy W;Ling, Hong-Fei;Edwards, Cole T;Shen, Yanan;Kump, Lee R;Lu, Zunli;Lu, Wanyi;Algeo, Thomas;Gutchess, Kristina M;Thomas, Ellen;Ridgwell, Andy
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2018
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Discipline Earth System Research
Spatial Coverage (65S-68N,1 E-10W)
Temporal Point 1986-03-04T11:59:59Z