Other
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1161l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 6, pp.1161-1171
Other
10
Scientific paper
Carbon and hydrogen isotopic compositions are reported for methane, hydrogen and carbon dioxide from four New Zealand geothermal areas: Ngawha, Wairakei, Broadlands and Tikitere. Carbon-13 contents are between -24.4 and -29.5%. (PDB) for methane, and between -3.2 and -9.1%. for carbon dioxide. Deuterium contents are between -142 and -197%. (SMOW) for methane and between -310 and -600%. for hydrogen. The different areas have different isotopic compositions with some general relationships to reservoir temperature. The isotopic exchange of hydrogen with water indicates acceptable reservoir temperatures of 180-260°C from most spring samples but often higher than measured temperatures in well samples. Indicated temperatures assuming 13 C equilibria between CH 4 and CO 2 are 100-200°C higher than measured maxima. This difference may be due to partial isotopic equilibration or may reflect the origin of the methane. Present evidence cannot identify whether the methane is primordial, or from decomposing sediments or from reduction of magmatic CO 2 . The isotopic equilibria between CH 4 , CO 2 , H 2 and H 2 O are reviewed and a new semi-empirical temperature scale proposed for deuterium exchange between methane and water.
Hulston John R.
Lyon G. L.
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