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Isotopic evidence for massive oxidation of organic matter following the great oxidation event.
Kump, Lee R; Junium, Christopher; Arthur, Michael A; Brasier, Alex; Fallick, Anthony; Melezhik, Victor; Lepland, Aivo; Crne, Alenka E; Luo, Genming.
Afiliação
  • Kump LR; Department of Geosciences, Pennsylvania State University, University Park, PA 16802, USA.
Science ; 334(6063): 1694-6, 2011 Dec 23.
Article em En | MEDLINE | ID: mdl-22144465
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 (δ(13)C) indicate high rates of organic matter burial and release of oxygen to the atmosphere; in the Neoproterozoic, the high δ(13)C interval was punctuated by abrupt swings to low δ(13)C, indicating massive oxidation of organic matter. We report a Paleoproterozoic negative δ(13)C 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.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Oxigênio / Atmosfera / Isótopos de Carbono / Planeta Terra / Sedimentos Geológicos País como assunto: Asia / Europa Idioma: En Ano de publicação: 2011 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Oxigênio / Atmosfera / Isótopos de Carbono / Planeta Terra / Sedimentos Geológicos País como assunto: Asia / Europa Idioma: En Ano de publicação: 2011 Tipo de documento: Article