Oxygen isotope variations in phosphate of biogenic apatites, II. Phosphorite rocks

Details Oxygen isotope variations in phosphate of biogenic apatites, II. Phosphorite rocks Oxygen isotope variations in phosphate of biogenic apatites, II. Phosphorite rocks

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..405s&link_type=abstract

Earth and Planetary Science Letters, Volume 64, Issue 3, p. 405-416.

Physics

14

Scientific paper

Phosphorites from sedimentary sequences ranging in age from Archaean to Recent were analysed for δ18O in both the PO4 (δ18Op) and CO3 (δ18Oc) in the apatite lattice. The oxygen isotope record is considerably better preserved in phosphates than in either carbonates or cherts. The use of the Longinelli and Nuti [8] temperature equation yields temperatures for Recent phosphorites that are in good agreement with those measured in the field. The δ18Op values of ancient phosphorites decrease with increasing age. These changes with time are not likely to be due to post-depositional exchange. Changes in δ18O values of seawater and variations of temperature with time can account for the δ18Op time trend, but the latter explanation is preferred. In Ancient phosphorites δ18Oc in structurally bound carbonate in apatite is not a reliable geochemical indicator.

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