The isotopic cycle of oceanic phosphate, I

Details The isotopic cycle of oceanic phosphate, I The isotopic cycle of oceanic phosphate, I

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32..389l&link_type=abstract

Earth and Planetary Science Letters, Volume 32, Issue 2, p. 389-392.

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Scientific paper

Steady-state conditions seem to exist in the Atlantic and Pacific Oceans in the case of the 18O content of dissolved phosphate. The measured δ 18O(PO43-) values are fairly constant at all latitudes and depths. A constant difference of about 1‰ exists between average Atlantic and Pacific results. Oxygen isotope measurements carried out on phosphate in the organic matter of fish, showed an average difference of about 3‰ when compared with dissolved oceanic phosphate. Such a difference can be attributed to biological fractionation effects in the metabolism of phosphate. However, the equilibrium fractionation factors in the phosphate-water system are poorly known and consequently we do not know whether this difference represents an approach to, or a deviation from, isotopic equilibrium conditions.

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