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Mössbauer analyses were conducted on a sample of saponite selected from DSDP Leg 69 basalt core. The sample was initially placed within a nitrogen-purged container on-board Glomar Challenger approximately three hours after recovery, where it remained until analysis. The Mössbauer data revealed an original, in situ Fe2O3/FeO ratio of 0.46, with both Fe* and Fe in octahedral coordination. With controlled exposure to air under ambient laboratory storage conditions, the proportion of Fe increased from an original 30% to 51% over a period of about 11.5 months. The Fe + thus produced remained in octahedral coordination, and no observable changes occurred in the physical appearance of the sample.

A Mössbauer Study of Saponite in Layer 2 Basalt, Deep Sea Drilling Project Leg 69