Other
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..355y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 2, pp.355-364
Other
10
Scientific paper
A plot of D vs. 18 O values from a diverse group of natural goethites defines a data array which is approximately parallel to the meteoric water line. The 18 O values range from -9.5 to +4.4 per mil, while the corresponding D values vary from -202 to -94 per mil. There is considerable scatter in the D vs. 18 O array, which can be attributed primarily to different temperatures of mineral formation. As determined previously (YAPP and Pedley, 1985), and confirmed in this study, the goethite-water D / H fractionation factor is essentially independent of temperature over the range from 25°C to 145°C. However, the goethitewater 18 O / 16 O fractionation factor does vary with temperature, as indicated by initial goethite synthesis experiments conducted at 25°C, 44°C and 62°C. The synthetic goethite 18 G - w values suggest that the natural goethites in this study formed at temperatures that may range from about 8°C to 66°C. Support for the validity of these approximate, calculated temperatures is provided by a natural goethite sample from the Atlantis II Deep in the Red Sea. These results suggest that goethite can be used as a single-mineral, low temperature geothermometer. Perhaps more importantly, goethite can be used in low temperature, oxygen isotope mineral-pair geothermometers such as chert-goethite, calcite-goethite, phosphate-goethite, etc.
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