Mass spectrometer measurements in the thermal areas of New Zealand : Part 2. Carbon isotopic ratios

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Scientific paper

The variation of the C 13 / C 12 ratio of gas and water samples from pools, bores and fumaroles of the North Island of New Zealand have been studied. In general the isotopic composition is in the range C 13 = 0 to -7 w.r.t. the PDB Belemnite Standard. Calculations of isotopic equilibrium temperatures from the C 13 values of methane and carbon dioxide have been made and indicate temperatures of 350° and 440° C on Big Donald Mound, White Island; of approximately 250° C from bores in the Wairakei area and 280° C from Champagne Pool at Waiotapu. These latter results are in good agreement with measured bore temperatures at depth.

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