The strontium concentration of Recent Indian Ocean sediments off the eastern coast of Somalia is strongly related to the total carbonate content and the carbonate mineralogy. The Sr-content decreases away from the coast with decreasing carbonate content and decreasing aragonite; low+high-magnesian calcite ratios. Thus littoral calcareous sands rich in carbonates with a low aragonite have the highest calcite ratio, whereas calcareous deep-sea clays with calcite as the only carbonate mineral have the lowest Sr-concentration.

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