Defect thermometry using rutile and feldspar

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Authors
Hoff, Christopher M.
Issue Date
2019-05
Type
Electronic thesis
Thesis
Language
ENG
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Geology
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Abstract
Within certain silicates, Ti can substitute for tetrahedral Si, a process that is highly temperature sensitive. I have explored the potential of using this substitution as the basis for a Ti-in-potassium feldspar (TitanOr) thermobarometer. Our experimental results show that Ti solubility in feldspar is highly temperature dependent and have calibrated its solubility over the range of 600-810°C and 0.5-1.0 GPa. Several rocks have been analyzed; the Ti contents from K-feldspar crystals of the Cathedral Peak Granodiorite from Yosemite National Park in California and the Fish Canyon Tuff of Colorado are consistent with models for their formation and match well with conditions obtained from using other thermobarometers. I also have applied TitanOr to the large K-feldspar megacrysts of the Ayer Crystalline Complex of Massachusetts.
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May 2019
School of Science
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Rensselaer Polytechnic Institute, Troy, NY
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