<sup>13</sup> C-Depleted Carbon Microparticles in >3700-Ma Sea-Floor Sedimentary Rocks from West Greenland
Minik T. RosingGeologisk Museum, Øster Voldgade 5-7, DK-1350 København K, Denmark, and Danish Lithosphere Center, Øster Voldgade 10, DK-1350 København K, Denmark
1999en
ABI
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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