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M o u N ta i N s i N t h e s e a seamount Mineral Deposits a source of rare Metals for high-techNology iNDustries figure 1. (a,B) two seabed photos showing fe-Mn nodules and fe-Mn crust from horizon guyot. seamount nodules typically have a larger nucleus than abyssal nodules and are really encrusted pebbles and cobbles. (c,D) slabbed samples from the Marshall islands. (c) Thick fe-Mn crust from labibjet seamount. (D) fe-Mn nodule from lomilik seamount. e-g are from east Diamante caldera, Mariana islands. (e) active gray-smoker zinc-sulfide chimneys from 345-m water depth (hein et al., 2005). (f) inactive, oxidized hydrothermal sulfide spire from 375 m (JaMstec, 2009 Natsushima cruise Nt0908). (g) group of inactive zinc-sulfide chimneys from 348 m (JaMstec, 2009, Natsushima cruise Nt0908). Bathymetry from smith and sandwell (JaMstec, 1997), with Mariana islands at the western margin and hawai`i just off the eastern margin; this region is the most prospective for fe-Mn crusts (hein et al., 2009).

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