The principal conclusions based on a petrographic investigation of the Hole 1105A gabbros largely confirm the conclusions from Hole 735B (Dick et al., 1991a; Natland et al., 1991). The suggestion is that the gabbros represent crystal mush originated in a subaxial chamber. Compaction and upward melt migration in the crystal mush was terminated with relatively large amounts of interstitial liquid remaining. Cooling of the trapped melt in the mush formed differentiated bodies and lenses by migration and crystallization along syntectonic channels induced by unroofing and pressure release deformation. This resulted in differentiation products along lateral and vertical channelways in the host gabbro that vary from olivine gabbro, to Fe-Ti oxide gabbro, gabbronorite, and apatite gabbros and show large compositional variations independent of the host olivine gabbros. Although the results from Hole 1105A imply strong similarities with the gabbros from Hole 735B, any direct correlation between the two nearby holes utilizing petrographic criteria is not possible.