Dear Bill,
> Is there a consensus on what the best method of determining carbonate
> alteration might be in Miocene to Cret age samples of bivalves?
I have used X-ray diffraction to distinguish primary aragonite from
secondary calcite in an Eocene gastropod. XRD can show quite
well whether diagenesis and calcite/aragonite variations will make a
significant difference to your isotope results.
Graham
Graham Shields
Carleton-Ottawa Geoscience Centre
University of Ottawa
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