Isotopic evidence for massive oxidation of organic matter following the great oxidation event.
Isotopic evidence for massive oxidation of organic matter following the great oxidation event.
复制标题
大氧化事件后有机物大规模氧化的同位素证据。
DOI：
10.1126/science.1213999
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Kump LR
中科院分区：
文献类型：
--
作者：
Kump LR
海洋碳的稳定同位素记录表明，元古宙开始和结束时，碳循环的极端波动。在古元古代[2500至1600万年前（Ma）]和新元古代（1000 ~ 542 Ma），高碳同位素比值（δ 13 C）的时间段延长，表明有机质埋藏速率高，氧释放到大气中;在新元古代，高δ 13 C间隔被突然向低δ 13 C的摆动打断，指示有机质的大量氧化。我们报告了一个古元古代负δ 13 C偏移，其幅度和持续时间与新元古代异常相似。这种顺河-弗朗斯维尔异常可能反映了富氧大气最初形成时岩石的强烈氧化风化作用。
The stable isotope record of marine carbon indicates that the Proterozoic Eon began and ended with extreme fluctuations in the carbon cycle. In both the Paleoproterozoic [2500 to 1600 million years ago (Ma)] and Neoproterozoic (1000 to 542 Ma), extended intervals of anomalously high carbon isotope ratios (δ13C) indicate high rates of organic matter burial and release of oxygen to the atmosphere; in the Neoproterozoic, the high δ13C interval was punctuated by abrupt swings to low δ13C, indicating massive oxidation of organic matter. We report a Paleoproterozoic negative δ13C excursion that is similar in magnitude and apparent duration to the Neoproterozoic anomaly. This Shunga-Francevillian anomaly may reflect intense oxidative weathering of rocks as the result of the initial establishment of an oxygen-rich atmosphere.