Glass and mineral geochemical data are presented for basalts from Ocean Drilling Program (ODP) Hole 896A. Phenocryst assemblages are dominated by calcic plagioclase (An_76–94.5) with olivine (Fo_80–91.6), Cr-Al spinel, and clinopyroxene. The origin of the calcic plagioclase and olivine mineral separates. Trapping temperatures of 1195°–1215°C are inferred for plagioclase (An_83–94.5). Inclusion compositions, interpreted to be in equilibrium with host plagioclase, are similar to the range of pillow-rim glasses from this hole. Primary melts, in equilibrium with Fo_91.6, are estimated to have ~15 wt% MrO and crystallization temperatures of ~1340°C.

Date of initial receipt: 22 August 1994
Date of acceptance: 15 February 1995

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