The carbon isotopic compositions of certain marine invertebrates and coals from the Australian Permian

Details The carbon isotopic compositions of certain marine invertebrates and coals from the Australian Permian The carbon isotopic compositions of certain marine invertebrates and coals from the Australian Permian

Jan 1960

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..18....1c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 18, Issue 1-2, pp.1-8

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7

Scientific paper

C 13 analyses are reported for Permian and Devonian brachiopods, Permian crinoids and Permian coals. O 18 analyses of the marine invertebrates are also given. Only the Permian brachiopods are isotopically preserved. Their mean C 13 value is significantly more positive than Cretaceous and Recent brachiopods and molluscs measured elsewhere. A single coal seam sampled in detail was very constant in C 13 , and a trend towards values some 2·5%. more negative from lower to upper Permian was observed for a sequence of seams. The lower Permian coal C 13 was approximately the same as upper Carboniferous coal measured elsewhere. The meaning of this Permian isotopic distribution is discussed in terms of an age-effect, but there are other possible explanations.

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