Magnesium and strontium were found as minor elements in 74 carbonate mud fractions analyzed by atomic absorption spectrophotometer. Statistically significant differences in mean magnesium and strontium content exist for four of five mud-accumulating environments. Maximum magnesium (mean 1.38.10 4 ppm) was found in the moat adjacent to magnesium-rich coralline algae sediment; maximum strontium (mean 0.58.10 4 ppm) was found in cellular reef deeps adjacent to strontium-rich stony corals and codiacean algae. Origin of these mud fractions is believed to be comminuted carbonate skeletons.

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