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SUMMARY

Initial results of investigation of the diagenesis of calcareous algae by electron microprobe are:

  • 1
    A few conceptacles and other cavities in Recent algae specimens are partly to completely filled with younger carbonate. In contrast to the surrounding skeleton of about 10–20% mol MgCO3-calcite, these deposits are either very low (0–2%) or very high (15–50%) in MgCO3 content.
  • 2
    Highest magnesian values in Recent algae studied are thought to be in high-Mg calcites rather than in any other phase, with very few possible exceptions.
  • 3
    Calcian dolomite replacing fossil algae in cores from Eniwetok Atoll commonly has Ca-rich lenses resembling exsolution laminae.