Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..487y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 2, pp.487-495
Physics
9
Scientific paper
Goethite samples analyzed for this study have a D range from -202 to -98 per mil with a corresponding D range of associated waters from about -110 to +7 per mil. Goethites with the most positive D values are from marine environments. Goethite-water equilibrium D / H fractionation factors measured in this laboratory at 100°C and 145°C and estimated for sedimentary temperatures from data on natural samples have values of about 0.900 at all three temperatures. These data suggest that goethite D values may be a direct, temperature-independent measure of the D values of the waters with which the goethite last equilibrated. Most of the goethite D values in this study reflect the D values of the modern waters in the locales of origin. Substitution of Mn and/or Al for Fe in the goethite structure may affect the mineral-water fractionation factor. Manganese appears to decrease the value of . The effect of Al substitution on has not yet been measured, but preliminary arguments suggest that increasing Al content could increase values.
Pedley Michael D.
Yapp Crayton J.
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