Fig. 1 Stratigraphic and chemostratigraphic trends in the Mount McRae Shale. Ratios of highly reactive iron (FeHR) to total iron (FeT) greater than 0.22 (blue bar) point to anoxic bottom waters, whereas the ratio of pyrite iron (FePY) to FeHR distinguishes between ferruginous (<0.7 to 0.8) and euxinic (>0.7 to 0.8; green bar) conditions (59). Filled circles show data from Reinhard et al. (15), recalculated according to Raiswell et al. (60), whereas open squares show results from quantitative x-ray diffraction analysis (60). Black shales dated using Re-Os geochronology were deposited from anoxic and euxinic bottom waters. Red and blue dashed lines indicate average Mo concentration in Archean and Proterozoic euxinic black shales, respectively (1). TOC, total organic carbon.
Supplementary Materials
Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/1/10/e1500777/DC1
Table S1. Re-Os abundance and isotope data for the Mount McRae Shale, Western Australia (drill core ABDP-9).
Additional Files
Supplementary Materials
Other Supplementary Material for this manuscript includes the following:
- Table S1 (Microsoft Excel format). Re-Os abundance and isotope data for the Mount McRae Shale, Western Australia (drill core ABDP-9).
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