The 18O/16O Ratio of 2-Billion-Year-Old Seawater Inferred from Ancient Oceanic Crust
作者： C. Holmden , K. Muehlenbachs
DOI: 10.1126/SCIENCE.259.5102.1733
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摘要: An oxygen isotope profile of the 2-billion-year-old Purtuniq ophiolite overlaps with similar profiles younger ophiolites and modern oceanic crust. This overlap implies (i) that there was a style seawater—ocean crust interaction during past 2 billion years; (ii) composition early Proterozoic seawater to value; (iii) sea-floor spreading rates were to, or greater than, average rates; (iv) carbonate rocks cherts low 18O/16O ratios do not reflect global-scale 18O depletion oceans.
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