Fig. 1: Bathymetric maps with sampling locations.

a Location of TAG and other hydrothermal vent fields and sulfide deposits (red symbols) along the TAG segment, north-central Mid-Atlantic Ridge: 1—Lost City; 2—MAR 30°N; 3—Broken Spur; 4—MAR 24°30’N; 5—Snakepit; 6—Surprise; 7—Puy des Folles; 8—Zenith-Victory; 9—Yubileinoe. Map modified from ref. 68 and ref. 69 and retrieved via GeoMapApp (http://www.geomapapp.org). b Detailed map of the TAG mound showing the collar locations of the ODP Leg 158 drill cores used in this study (957C, 957E, 957H, 957M, and 957P). Map modified from ref. 70 and retrieved via GeoMapApp.