Widespread iron-rich conditions in the mid-Proterozoic ocean
Widespread iron-rich conditions in the mid-Proterozoic ocean
复制标题
中元古代海洋广泛存在富铁条件
DOI：
10.1038/nature10327
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发表时间：
2011-09-22
期刊：
影响因子：
64.8
通讯作者：
Lyons, Timothy W.
中科院分区：
文献类型：
--
作者：
Planavsky, Noah J.;McGoldrick, Peter;Lyons, Timothy W.
随着地球表面的氧化，海洋的化学成分发生了显着变化（1），这一过程深刻地影响了生命的进化和生态历史（2，3）。早期地球的特征是海洋-大气系统的减少，而中生代（不到5.42亿年前）以有利于动物辐射的稳定和含氧生物圈而闻名。地球中世纪（18 - 10亿年前）地表环境的氧化还原特征不太为人所知，但一般认为中元古代是全球硫化物（富氧）深海的家园（2，3）。在这里，我们提出了铁数据从一套中元古代海相泥岩。与流行的模型相反，我们的研究结果表明，含铁（缺氧和Fe 2+丰富）的条件是在空间和时间上广泛的不同的古地理环境中的中元古代海洋，邀请新的模型的时间分布的铁的形成和生物必需的微量元素的可用性在一个关键窗口真核生物进化。
The chemical composition of the ocean changed markedly with the oxidation of the Earth's surface(1), and this process has profoundly influenced the evolutionary and ecological history of life(2,3). The early Earth was characterized by a reducing ocean-atmosphere system, whereas the Phanerozoic eon (less than 542 million years ago) is known for a stable and oxygenated biosphere conducive to the radiation of animals. The redox characteristics of surface environments during Earth's middle age (1.8-1 billion years ago) are less well known, but it is generally assumed that the mid-Proterozoic was home to a globally sulphidic (euxinic) deep ocean(2,3). Here we present iron data from a suite of mid-Proterozoic marine mudstones. Contrary to the popular model, our results indicate that ferruginous (anoxic and Fe2+-rich) conditions were both spatially and temporally extensive across diverse palaeogeographic settings in the mid-Proterozoic ocean, inviting new models for the temporal distribution of iron formations and the availability of bioessential trace elements during a critical window for eukaryotic evolution.