Abstract
The concentrations of the major substitutents Na, Sr, CO 3 and SO 4 in the carbonate—fluorapatite phase of marine sedimentary phosphorites show large systematic variations between, and within, deposits now on land, whilst variations are minimal between, and within, present sea-floor deposits. These variations reflect the influence of weathering and suggest that all marine carbonate—fluorapatite originally has approximately the same chemical composition.
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