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The geologic history of seawater d18O

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A 10 -15‰ secular trend in the d18O of marine sedimentary rocks (e.g., carbonate rocks, cherts) over Earth history has been ascribed to higher early surface temperatures or to a more 18O-depleted early ocean. This longstanding debate has persisted due to the dual effect of temperature and solution d18O on the oxygen isotope composition of marine precipitates. We constructed a new record of marine iron oxide d18O values, which suggests that the early ocean was 18O-depleted, and that the early climate was cool.

This talk is part of the Occasional Earth Science Seminars series.

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