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- W2020829963 abstract "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." @default.
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- W2020829963 date "1977-09-01" @default.
- W2020829963 modified "2023-09-27" @default.
- W2020829963 title "Carbon isotope composition of graphite and carbonate minerals from 3.8-AE metamorphosed sediments, Isukasia, Greenland" @default.
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- W2020829963 doi "https://doi.org/10.1016/0012-821x(77)90210-2" @default.
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