The <sup>18</sup> O/ <sup>16</sup> O Ratio of 2-Billion-Year-Old Seawater Inferred from Ancient Oceanic Crust
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- C. Holmden
- Department of Geology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3
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- K. Muehlenbachs
- Department of Geology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3
書誌事項
- 公開日
- 1993-03-19
- DOI
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- 10.1126/science.259.5102.1733
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:p> An oxygen isotope profile of the 2-billion-year-old Purtuniq ophiolite overlaps with similar profiles of younger ophiolites and the modern oceanic crust. This overlap implies (i) that there was a similar style of seawater—ocean crust interaction during the past 2 billion years; (ii) that the oxygen isotope composition of early Proterozoic seawater was similar to the modern value; (iii) that early Proterozoic sea-floor spreading rates were similar to, or greater than, average modern rates; and (iv) that early Proterozoic carbonate rocks and cherts with low <jats:sup>18</jats:sup> O/ <jats:sup>16</jats:sup> O ratios do not reflect global-scale <jats:sup>18</jats:sup> O depletion of early Proterozoic oceans. </jats:p>
収録刊行物
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- Science
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Science 259 (5102), 1733-1736, 1993-03-19
American Association for the Advancement of Science (AAAS)
