Oxygen isotopic composition of fissure-grown quartz, adularia, and calcite from Broadlands geothermal field, New Zealand, with an appendix on quartz-K-feldspar-calcite-muscovite oxygen isotope geothermometers

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ID: 296796
1975
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Abstract
Oxygen isotope analyses of well developed, fissure grown quartz, adularia, and calcite crystals are related to downhole temperatures and other data from the Ohaki-Broadlands geothermal field. The bore No. BR 7 profile shows how oxygen isotope analyses of geothermal minerals provide quantitative evidence on subsurface hydrology, particularly with regard to zones of boiling, and on the past stability of a geothermal system. The lower part of this profile permits correlation of a temperature of 275 degrees C with 10 ^3^ ln\[(O18/O16)quartz/(O18/O16)K-feldspar\] = 3.3. Based on the constraints gained from Broadlands, on the 600 degrees C quartz-K-feldspar fractionation from Blattner and Bird (1974), and on earlier data of O9Neil and Taylor (1967, 1969) and O9Neil, Clayton, and Mayeda (1969), quartz-feldspar, quartz-calcite, and quartz-muscovite oxygen isotope geothermometers may be calibrated independently of isotopic analyses of solutions. The corresponding new equations are: 10 ^3^ ln alpha (quartz-K-feldspar) = 0.82+0.74 10 ^6^ K (super -2) 10 ^3^ ln alpha (quartz-muscovite) = 1.30+1.27 10 ^6^ K (super -2) 10 ^3^ ln alpha (quartz-calcite) = 0.37+0.88 10 ^6^ K (super -2) \[NBS-28 = 9.8/PDB = 30.36\]. The constant of the quartz-calcite equation depends directly on the scales of reporting used for silicates and carbonates respectively.
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Authors Peter Blattner
Journal american journal of science
Year 1975
DOI
10.2475/ajs.275.7.785
URL
https://ajs.scholasticahq.com/article/59791.pdf
Keywords Keywords not found

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