Computer Science
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..36..280p&link_type=abstract
Earth and Planetary Science Letters, Volume 36, Issue 2, p. 280-284.
Computer Science
7
Scientific paper
Graphite comprises about 2% of some of the 3.8-AE metamorphosed sedimentary rocks of Isukasia, west Greenland. δ13CPDB of carbon in this graphite ranges from -16.0 to -9.3‰. For those samples that contain both graphite and siderite, Δcarbonate-graphite is about 6; this fractionation is consistent with an inorganic equilibrium between siderite and graphite at roughly 400-500°C. It is likely that graphite found in these rocks formed by the reaction: 6FeCO3 = 2Fe3O4 + 5CO2 + C in which case it is of little help in determining whether or not organisms were active 3.8 AE ago. The presence of quartz-magnetite-cummingtonite-iron formation in the Isukasia metasedimentary sequence may, ultimately, be one of the most powerful environmental indicators remaining in these rocks.
Ahmad Nor Sofiah
Perry Eugene C.
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