Temperature dependence of the oxygen isotopic fractionation between diatom silica and water

Details Temperature dependence of the oxygen isotopic fractionation between diatom silica and water Temperature dependence of the oxygen isotopic fractionation between diatom silica and water

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84...69l&link_type=abstract

Earth and Planetary Science Letters, Volume 84, Issue 1, p. 69-74.

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Scientific paper

We present a new paleotemperature scale, based on the oxygen isotopic ratio of the non-exchangeable fraction of the oxygen from diatom silica. The equation t = 17.2 - 2.4 (δ18Osilica - δ18Owater - 40) - 0.2 (δ18Osilica - δ18Owater - 40)2 was derived using recent sediment samples from different oceanic areas, the temperature and isotopic composition of the local surface water. Comparison of our results with other relationships established for quartz-water or amorphous silica-water at higher temperature suggests no difference in isotopic fractionation between quartz-water and biogenic silica-water couples.

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