Molybdenum isotope evidence for widespread anoxia in mid-proterozoic oceans
Molybdenum isotope evidence for widespread anoxia in mid-proterozoic oceans
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DOI：
10.1126/science.1091785
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发表时间：
2004-04-02
期刊：
影响因子：
56.9
通讯作者：
Lyons, TW
中科院分区：
文献类型：
--
作者：
Arnold, GL;Anbar, AD;Lyons, TW
在18亿至10亿年前的中元古代海洋中存在多少溶解氧存在激烈的争论。一个模型认为，在大气中氧气最初上升后不久，海洋就氧化了，类似于23亿年前。然而，最近在一些中元古代海洋盆地中发现硫化氢的证据表明，深海直到很久以后才处于缺氧状态。来自现代和古代沉积物的新钼同位素数据表明，与现今海洋相比，中元古代的缺氧程度有所扩大。因此，深海的氧化作用可能比大气的氧化作用晚了10亿多年。
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 similar to2.3 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.