“…These include the precipitation of secondary minerals, iron oxides, sulfides, or chert (Fryklund and Fletcher, 1956;Bischoff et al, 1983;Arnorsson, 1984;Bernstein, 1985;Kolodny and Halicz, 1988;Mortlock et al, 1993;Evans and Derry, 2002;Kurtz et al, 2002). For example, at Baby Bare Ge could be removed in (1) Fe-rich phases, which are ubiquitous as veins and alteration halos in basaltic crust near Baby Bare (Yatabe et al, 2000), (2) basal iron-rich (metalliferous) sediment (Buatier et al, 2001), (3) secondary sulfides, which are common in basaltic crust near Baby Bare (Hunter et al, 1999;Marescotti et al, 2000), (4) silicate clays (Porter et al, 2000), or (5) secondary quartz (Porter et al, 2000).…”