Supplement to: Lalou, Claude; Brichet, Evelyne; Jehanno, Celestine; Perez-Leclaire, Heloise (1983): Hydrothermal manganese oxide deposits from Galapagos mounds, DSDP Leg 70, hole 509B and Alvin dives 729 and 721. Earth and Planetary Science Letters, 63(1), 63-75, https://doi.org/10.1016/0012-821X(83)90022-5