Defect thermometry using rutile and feldspar

Authors
Hoff, Christopher M.
ORCID
Loading...
Thumbnail Image
Other Contributors
Watson, E. Bruce
Lewis, Daniel J.
Roecker, Steven W.
Spear, Frank S.
Issue Date
2019-05
Keywords
Geology
Degree
PhD
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
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.
Description
May 2019
School of Science
Department
Dept. of Earth and Environmental Sciences
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
Access
Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.