Molybdenum isotope evidence for widespread anoxia in mid-Proterozoic oceans
Arnold, G.L.; Anbar, A.D.; Barling, J.; Lyons, T.W. (2004). Molybdenum isotope evidence for widespread anoxia in mid-Proterozoic oceans. Science (Wash.) 304(5667): 87-90. https://dx.doi.org/10.1126/science.1091785
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, meer
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| Auteurs | | Top |
- Arnold, G.L.
- Anbar, A.D.
- Barling, J.
- Lyons, T.W.
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| Abstract |
How much dissolved oxygen was present in the mid-Proterozoic oceans between 1.8 and 1.0 billion years ago is debated vigorously. One model argues for oxygenation of the oceans soon after the initial rise of atmospheric oxygen ∼2.3 billion years ago. Recent evidence for H2S in some mid-Proterozoic marine basins suggests, however, that the deep ocean remained anoxic until much later. New molybdenum isotope data from modern and ancient sediments indicate expanded anoxia during the mid-Proterozoic compared to the present-day ocean. Consequently, oxygenation of the deep oceans may have lagged that of the atmosphere by over a billion years. |
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