Abstract:Site 648 provided a unique view of the internal structure of an axial rift valley volcano. The uppermost 30 m consists of pillow la vas, which built the volcanic edifice. The lower lithologic units con sist of a vesicular basalt underlain by a massive holocrystalline ba salt. These lower units probably represent massive flows that ponded inside Serocki Volcano.Site 648 basalts are moderately evolved normal mid-ocean ridge basalt, saturated with olivine and plagioclase, which are geochemically similar to basalt… Show more
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