Figure 23 | Table of Contents

Figure 22. Close-up photograph of interval 187-1157B-3R-1, 137-147 cm. Calcite veins sporadically lined with thin silica selvages are surrounded by symmetric alteration halos in which the groundmass and olivine phenocrysts are largely replaced by smectite and Fe oxyhydroxide. Spotty Mn oxide is common within the calcite veins and along silica selvages.

Figure 23 | Table of Contents