D/H fractionation factors between serpentine and water at 100° to 500°C and 2000 bar water pressure, and the D/H ratios of natural serpentines

Details D/H fractionation factors between serpentine and water at 100° to 500°C and 2000 bar water pressure, and the D/H ratios of natural serpentines D/H fractionation factors between serpentine and water at 100° to 500°C and 2000 bar water pressure, and the D/H ratios of natural serpentines

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..40..231s&link_type=abstract

Earth and Planetary Science Letters, Volume 40, Issue 2, p. 231-242.

Physics

8

Scientific paper

D/H fractionation factors between serpentine (clinochrysotile) and water were experimentally determined to be: 1 000 In αser-w = 2.75 × 107/T2 - 7.69 × 104/T + 40.8 in the temperature range from 100 to 500°C. The present results do not support the semi-empirical fractionation factors employed by Wenner and Taylor [1] for the interpretation of δD values of natural serpentines. About 100 serpentines from the Japanese Islands have δD values from -110 to -40‰ SMOW, with antigorite being from -40 to -60‰. The results are in accord with the two conclusions by Wenner and Taylor [1,2], that is, the presence of a latitude -δD correlation and the more uniform and higher δD values of antigorite than chrysotile and lizardite. According to the present fractionation factors, almost none of the continental lizardite-chrysotile serpentines could have formed at a temperature below 500°C under equilibrium with fluids of δD values similar to the present-day local meteoric waters. The fluid responsible for oceanic serpentinization could be either a mixture of oceanic and magmatic water or oceanic water alone. However, full interpretation of the δD values of natural serpentines should wait until kinetic behaviors of hydrogen isotopes in serpentinization are better understood.

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