13C-Depleted carbon microparticles in >3700-Ma sea-floor sedimentary rocks from west greenland |
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Authors: | MT Rosing |
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Affiliation: | Geologisk Museum, Oster Voldgade 5-7, DK-1350 Kobenhavn K, Denmark, and Danish Lithosphere Center, Oster Voldgade 10, DK-1350 Kobenhavn K, Denmark. E-mail: minik@savik.geomus.ku.dk. |
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Abstract: | Turbiditic and pelagic sedimentary rocks from the Isua supracrustal belt in west Greenland [more than 3700 million years ago (Ma)] contain reduced carbon that is likely biogenic. The carbon is present as 2- to 5-micrometer graphite globules and has an isotopic composition of delta13C that is about -19 per mil (Pee Dee belemnite standard). These data and the mode of occurrence indicate that the reduced carbon represents biogenic detritus, which was perhaps derived from planktonic organisms. |
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