Extended Data Fig. 5: Additional plot of box modeling results for marine 187/188Os.
From: Abrupt episode of mid-Cretaceous ocean acidification triggered by massive volcanism
This includes the scenario of large igneous province (LIP) volcanism (top panel, A) and a second scenario (bottom panel, B) where fluxes of radiogenic osmium from continental weathering (Friv) are set to increase by 80% for 500 kiloyears through Oceanic Anoxic Event 2 (OAE2)29. An increase in Friv necessitates an even larger increase in the flux of unradiogenic osmium from large igneous province sources (FLIP) by as much as 50x larger than background mantle/volcanic fluxes. Model outputs are plotted against initial osmium isotope ratio data (Osi) through OAE2 from IODP Site U1516 in the Indian Ocean (circle symbols and dotted line, this study) and the Angus Core in the Western Interior Basin of North America17.
