U-rich Archaean sea-floor sediments from Greenland - indications of >3700 Ma oxygenic photosynthesis

Details U-rich Archaean sea-floor sediments from Greenland - indications of >3700 Ma oxygenic photosynthesis U-rich Archaean sea-floor sediments from Greenland - indications of >3700 Ma oxygenic photosynthesis

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.217..237r&link_type=abstract

Earth and Planetary Science Letters, Volume 217, Issue 3-4, p. 237-244.

Computer Science

26

Isua, Oxygenic Photosynthesis, Carbon, Archaean, Pb Isotopes, U, Th

Scientific paper

3700 Ma metamorphosed pelagic shale from West Greenland contains up to 0.4 wt% reduced carbon with δ13C values down to -25.6‰ [PDB, PeeDee Belemnite]. The isotopic signature and mode of occurrence suggest that the carbon derived from planktonic organisms. The Pb isotopic composition shows that the shale had high primary U/Th. This indicates that organic debris produced a local reducing environment which precipitated U transported to the site of sedimentation by oxidized ocean water. The existence of highly productive plankton that fractionated C isotopes strongly and set up oxidation contrast in the environment suggests that oxygenic photosynthesis evolved before 3700 Ma.

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