Loading...
Petrogenetic Study Of A Platiniferous Zone Of The Stillwater Complex, Montana
Elliott, W. Crawford
Elliott, W. Crawford
Citations
Altmetric:
Genre
Thesis/Dissertation
Date
1981
Advisor
Committee member
Group
Department
Earth and Environmental Science
Subject
Permanent link to this record
Collections
Files
Loading...
Elliott-Thesis-1981.pdf
Adobe PDF, 1.29 MB
Research Projects
Organizational Units
Journal Issue
DOI
http://dx.doi.org/10.34944/dspace/8406
Abstract
Intrinsic oxygen fugacity values (fO2) were measured for the Pt-rich zone (described by Conn, 1979), and its enclosing units, of the Stillwater Complex, Montana, to approximate the early redox conditions under which the ore zone had formed. The oxidized values of fO2 measured for the Pt-rich horizon (10^-10.5 at 1100 C) are thought to have been the result of the autometamorphic breakdown of olivine to serpentine. The fO2 values measured for the plagioclase cumulate footwall units are between WI and WM buffers, and those values also agreed with published value for the Bushveld Complex, and the Skaergaard Complex. Graphite is found in both the Stillwater Pt-rich zone and the platiniferous Merensky Reef of the Bushveld Complex. The very reduced values measured for the Basal Chromite of the Merensky Reef (10^-16 at 1100 C) suggests graphite buffering conditions. Graphite in the Pt-rich zone is associated with sepentine minerals, but various lines of evidence indicate that graphite is not an equilibrium assemblage with serpentine. It is concluded that serpentinization, and other metamorphic reactions, oxidized both the silicate minerals and the iron-platinum alloys of the Stillwater Pt zone. The fO2 values measured for the Stillwater Pt-rich zone do not represent the actual redox conditions under which it was formed.
Description
Citation
Citation to related work
Has part
ADA compliance
For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu
Embedded videos
License
IN COPYRIGHT- This Rights Statement can be used for an Item that is in copyright. Using this statement implies that the organization making this Item available has determined that the Item is in copyright and either is the rights-holder, has obtained permission from the rights-holder(s) to make their Work(s) available, or makes the Item available under an exception or limitation to copyright (including Fair Use) that entitles it to make the Item available.