Fig. 1: Location of the Shinkai dive #1507.
From: Hadal aragonite records venting of stagnant paleoseawater in the hydrated forearc mantle
a Bathymetric map of Izu–Ogasawara trench, with inset map showing the location of Japan and of the study area (red rectangle). The sampling location of serpentinized peridotite (6K#1507) is shown by a pink star, along with previous locations where peridotite or gabbro were recovered. b Enlarged bathymetric map of the area depicted by the black-and-white rectangle in Fig. 1a, around the Umigame seamount located in the southern Izu–Ogasawara Trench. Maps in a and b were drawn using Generic Mapping Tools 5.4.592 with ETOPO1_Bed_g_gmt4.grd93, 94 (a) and grid data from the KR08-07 and KH07-02 cruises (b). c Depth profiles of seawater temperature, salinity, and dissolved oxygen (D.O.) during the DSV Shinkai 6500 dive #1507 (13 July 2017). The dive and sampling were conducted at ~6400 mbsl, which is deeper than both the carbonate (calcite) compensation depth (CCD; 4000–4500 mbsl)27 and aragonite compensation depth (ACD; 500–1500 mbsl)32.
