Extended Data Fig. 4: Mass-balance model results for seawater [Mo]aq changes over time in response to expansion of seafloor euxinic area (Ex).
From: Basin-scale reconstruction of euxinia and Late Devonian mass extinctions
[Mo]aq in the Williston Basin during the Hangenberg Event is estimated from Mo/TOC ratios in LB3 sediments. This is based on empirical data from modern euxinic basins where the relationship between deep-water [Mo]aq and sediment Mo/TOC is expressed with the equation Mo/TOC = 4.7389e25.457x, where x = [Mo]aq (ref. 59). To test differences in model results across the spread of Mo/TOC ratios recorded in LB3, we explored the 25th percentile, median and 75th percentile Mo/TOC values (seen in box and whisker plot on the right and covered by the orange horizontal shading on the left). Maximum duration of the Hangenberg Event was estimated at ~200 kyr by ref. 60. This time frame is highlighted by the blue vertical shading.
