doi: 10.1126/science.283.5402.674.
13C-Depleted carbon microparticles in >3700-Ma sea-floor sedimentary rocks from west greenland
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- PMID: 9924024
- DOI: 10.1126/science.283.5402.674
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13C-Depleted carbon microparticles in >3700-Ma sea-floor sedimentary rocks from west greenland
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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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