Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1213y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 6, pp.1213-1220
Physics
4
Scientific paper
Carbon, as a possibly "indigenous" minor element impurity in goethites, appears to exist in two principal forms: 1. (1) CO 2 trapped in the mineral structure and 2. (2) organic matter. With one exception the total carbon content of the samples in this study ranges between 0.2 and 2.0 weight percent (reported as CO 2 ). Total carbon 13 C values have a range from -27.2 to -8.1 per mil. Values of the mole fraction of trapped CO 2 in the goethite total carbon as determined for seven samples vary from 0.11 to 0.50. Much of the variation of total carbon 13 C values in these samples can be attributed to different trapped CO 2 /organic matter ratios in the different goethites. By analogy with speleothems and soil carbonates, 13 C values of trapped CO 2 could indicate whether the environment of goethite formation was relatively open or closed to mixing with CO 2 from the Earth's atmosphere. In goethite samples subjected to H 2 O 2 treatment, calculated organic matter 13 C values range from about -35 to -24 per mil. These values probably reflect a predominance of organic matter derived from C 3 plants in this particular sample population. 13 C / 12 C ratios in organic matter associated with goethite could be a source of information on the Earth's ancient biosphere.
Poths Harald
Yapp Crayton J.
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