Fig. 1: Geochemical and isotopic data for the proximal Shuanghe (SH) outcrop section and the distal Wuxi (WX) drill core from the Yangtze Shelf Sea, South China.
From: A nutrient control on expanded anoxia and global cooling during the Late Ordovician mass extinction
Data for δ13Corg, Corg, Ptot, climate change and redox conditions for the SH section are modified from ref. 4. See Supplementary Information for the climate and redox characterization of the WX drill core. Six stratigraphic horizons (A to F) are distinguished based on these water column redox dynamics. The two extinction intervals of the LOME are denoted as LOMEI-1 and LOMEI-22, 4. Open circles represent samples with anomalous Pdet contents or Pdet/Al ratios, which likely represent post-depositional transfer of Paut to Pdet (see main text and Supplementary Information for details). While this affects Corg/Preac ratios (and hence the ratios for these samples are discluded from consideration), it does not affect Corg/Porg ratios. Dashed blue line represents the average Ptot concentration for Post-Archean Australian Shale (PAAS). A molar C/P ratio of 106:1 denotes the Redfield ratio (red dashed line). The ages of graptolite zones are from ref. 1. Graptolite zones: D. cn. Dicellograptus complanatus, D. cx. Dicellograptus complexus, P. pacificus Paraorthograptus pacificus, M. e. Metabolograptus extraordinarius, M. p. Metabolograptus persculptus, A. a. Akidograptus ascensus. Rhud. Rhuddanian, Lx Linxiang Formation, KB Kuangyinchiao Bed, Lm.Fm. Lungmachi Formation.
