Figure 13. Section 185-801C-15R-7 showing the extreme alteration types observed. The pale green alteration separates an interflow sediment. The gray-green alteration at the bottom of the core is typical of much of the background alteration in the cores from this site. The proportions of the main secondary minerals are given, as are photomicrographs in which saponite, smectite, and calcite are visible. The two photomicrographs of the pale green alteration show a plagioclase phenocryst, found only rarely in dominantly aphyric lavas.

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