Logged to 1062.1 feet, an olivine cumulate xenolith

Today we logged rock core boxes to a depth of 1062.1 ft, 73.5 ft deeper than yesterday.  Interestingly, almost all of our logging was dedicated to a single unit that we still haven't found the base of yet.  This unit is a series of alternating cinder fall units and pahoehoe lava flows that all exhibit the same distinct mineralogy: moderately olivine plagioclase-phyric basalt (the mineral plagioclase is present as phenocrysts composing 3-10% of the rock, and plagioclase is always more abundant than olivine the olivine phenocrysts).  Hopefully tomorrow we'll finish logging this unit and by then we'll understand it better.

The photo above is a close-up shot of one of the pahoehoe flows from the unit we spent most of the day logging.  I think the photo shows a xenolith or grouping of olivine crystals that accumulated in the magma chamber just before eruption.  Olivine is a dense mineral that often accumulates along the bottom or sides of magma chambers, but we haven't seen a grouping like this but once before in the core.