Stable hydrogen isotopes in iron oxides--isotope effects associated with the dehydration of a natural goethite

Details Stable hydrogen isotopes in iron oxides--isotope effects associated with the dehydration of a natural goethite Stable hydrogen isotopes in iron oxides--isotope effects associated with the dehydration of a natural goethite

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1277y&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 7, pp.1277-1287

Computer Science

4

Scientific paper

The dehydration of a natural goethite to hematite is accompanied by a systematic hydrogen isotope fractionation. Closed system dehydration at, and below, 250°C results in a significantly greater degree of isotopic fractionation than does open system dehydration. This relationship is apparently reversed at 300°C. Both processes produce a progressive decrease in the D / H ratio of the mineral hydrogen with increasing degree of dehydration. At temperatures of 160°C to 250°C the closed system mineralvapor fractionation factor is independent of temperature, while above 250°C, it varies strongly with temperature. The mineral-vapor fractionation factor associated with open system dehydration appears to be independent of temperature over the interval 160°C to 300°C. The closed system D / H fractionation suggests that natural goethite undergoing dehydration in the presence of water can isotopically exchange with that water. CO 2 loss from goethite during dehydration is correlated with the loss of H 2 O. The CO 3 is thought to be present in carbonates which exist as impurities in the goethite. Loss of both H 2 O and CO 2 appears to be diffusion-controlled.

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