Abstract
Glass and mineral geochemical data are presented for basalts from Ocean Drilling Program (ODP) Hole 896A. Phenocryst assemblages are dominated by calcic plagioclase (An76_945) with olivine (Fo80_91 6), Cr-Al spinel, and clinopyroxene. The origin of the calcic plagioclase phenocrysts was investigated by heating-stage experiments on silicate melt inclusions in plagioclase and olivine mineral separates. Trapping temperatures of 1195°-1215°C are inferred for plagioclase (An83_945). 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 Fo9| 6, are estimated to have -15 wt% MgO and crystallization temperatures of ~1340°C.
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