Supporting information for "Reaction mechanism and water/rock ratios involved in epidosite alteration of the oceanic crust"

Supporting information for "Reaction mechanism and water/rock ratios involved in epidosite alteration of the oceanic crust" by Samuel Weber, Larryn W. Diamond, Peter Alt-Epping and Alannah C. Brett-Adams.

Figure S1: Molar Mg/(Mg + Fe) of chlorite across spilite–epidosite reaction fronts. Plots transition from least epidosite-altered (left) to most altered (right) part of thin-sections.  

Figure S2: Mineral composition of sample “Median” at W/R ratio 40, 75, 3000 and 30000. Calculations at 350 °C, 50 MPa. 

Table S1: Bulk-rock chemical compositions of spilites (spl) and epidosites (epi), their sampling locations, rock types and densities. 

Table S2: Chlorite EMPA spot analyses, reported in wt% oxides. Reported analyses of each sample start in least epidotized area of thin-section and increase in alteration grade

Table S3: Electron microprobe analyses of epidote in spilitized Geotimes lavas (Sample AB17-32-spl)

Table S4: Dimensionless element enrichment factors (Equation 1) from reactive-transport simulations at 350 °C

Table S5: Minerals and aqueous species used in the reactive-transport simulations

Table S6: Electron microprobe analyses of relict igneous plagioclase in spilitized Geotimes lavas (Sample AB17-38-spl)