Computer Science
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1553a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 7, pp.1553-1560
Computer Science
3
Scientific paper
Amphibolite-grade metasediments from the Mgama Hills region, Kenya, contain conspicuous quantities of graphite, most probably derived from organic progenitor materials. The highest graphite contents (5.1-20.4%) are found in schists whereas calcite marbles intercalated in the sequence contain relatively low amounts (0.1-2.0%). The graphitic constituents are consistently enriched in 13 C relative to common sedimentary organic material, with the highest isotopic ratios in graphite from the marbles ( 13 C = -7.3 ± 5.0%.; n = 10). Carbon isotope fractionations between calcite and graphite mostly vary between 3.3 and 7.1 , which comes close to both empirically recorded and thermodynamically calculated fractionations in the temperature range of the upper amphibolite faciès (550-650°C). However, larger values occasionally encountered in the marbles suggest that complete isotopic equilibrium is not always attained in amphibolite-facies metamorphism.
Amstutz G. C.
Arneth J.-D.
Goerg U.
Sarbas B.
Schidlowski Manfred
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