Figure F1. Ca# vs. Mg# plot of compositions of recovered gabbroic rock, Site U1415. Gabbronorite and gabbro with >2% orthopyroxene (Opx) is grouped as orthopyroxene-bearing gabbro. For comparison, a compilation of plutonic rock sampled along the East Pacific Rise (EPR) at Hess Deep (Hékinian et al., 1993; Gillis, Mével, Allan, et al., 1993; Miller et al., 1996; Natland and Dick, 2009; Pedersen et al., 1996; Hanna, 2004; Kirchner and Gillis, 2012), Pito Deep (Perk et al., 2007), and other locations (Saunders et al., 1982) is shown. The range of composition of gabbro drilled in slow-spreading oceanic crust in Ocean Drilling Program (ODP) Hole 735B at Southwest Indian Ridge (Dick, Natland, Miller, et al., 1999), during ODP Leg 153 (Cannat, Karson, Miller, et al., 1995), and at Integrated Ocean Drilling Program (IODP) Site U1309 on the Mid-Atlantic Ridge (Expedition 304/305 Scientists, 2006; Godard et al., 2009) and (refractory and impregnated) abyssal peridotite (compilation of Bodinier and Godard, 2003) is also illustrated. Note that Hess Deep gabbro with a Mg# of ~72–79 has been recently analyzed (MacLeod et al., pers. comm., 2013) but was not added to the Hess Deep data set because the results are not yet published. Ol = olivine.
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