Supplemental material: Alkaline vents and steep Na<sup>+</sup> gradients from ridge-flank basalts—Implications for the origin and evolution of life R. Price et al. 10.1130/2017390 https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_Alkaline_vents_and_steep_Na_sup_sup_gradients_from_ridge-flank_basalts_Implications_for_the_origin_and_evolution_of_life/12535883 GSA Data Repository Item 2017390, Geology. 2017-01-01 00:00:00 Geoscience