Figure F7. Bulk rock Mg# versus depth for Hess Deep Rift gabbroic rocks. Note that the base of the sheeted dike complex occurs at ~2900 mbsl along the Northern Escarpment and at ~3000 mbsl at the intrarift ridge. Data sources: ODP Site 894 (Pedersen et al., 1996), Cruise JC021 (C. MacLeod, unpubl. data, 2009), NazCoPac cruise (Blum, 1991), Northern Escarpment (Hanna, 2004; Natland and Dick, 1996). IR = intrarift ridge.
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