Oxygen isotopes in an oolitic ironstone and the determination of goethite 18 O values by selective dissolution of impurities: The 5M NaOH method

Details Oxygen isotopes in an oolitic ironstone and the determination of goethite 18 O values by selective dissolution of impurities: The 5M NaOH method Oxygen isotopes in an oolitic ironstone and the determination of goethite 18 O values by selective dissolution of impurities: The 5M NaOH method

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2627y&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 9, pp.2627-2634

Computer Science

11

Scientific paper

Treatment of iron (III) oxides with hot 5 M NaOH solution can selectively dissolve silicate impurities ( and , 1982). In the current work 5M NaOH solutions enriched in 18 O (+670%.) were employed to determine if this method could be used to purify goethites for 18 O analysis. These experiments suggest that the structural stoichiometric oxygen in well-crystallized goethites does not exchange with hot 5 M NaOH solution. Therefore, this selective dissolution method appears to be isotopically viable. 18 O-"normal" 5 M NaOH treatments were applied to goethite-dominated ooids of the Upper Ordovician Neda Fm. ironstone. While not completely removed by successive NaOH treatments, the impurities were incrementally dissolved in constant elemental proportions (within analytical error). Consequently, the 18 O value of the endmember goethite could be determined by material balance calculations. This goethite 18 O value is -1.0%. for all analyzed samples of Neda Fm. ooids, including those from occurrences about 200 km apart. The spatial uniformity of the oolitic goethite 18 O values suggests uniform conditions of goethite formation. The conditions might have been those of a low latitude continental weathering environment.

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