Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5783331 | Geochimica et Cosmochimica Acta | 2017 | 43 Pages |
Abstract
Hydrothermal reequilibration of igneous magnetite has led to progressive chemical purification, during which trace elements such as Ti, Al, Mg, Zn, and Cr contents decrease dramatically (up to 2-3 orders of magnitude different), coupled with significant increase in iron concentrations from less than 64Â wt.% to higher than 70Â wt.%. Results presented here show that magnetite is much more susceptible to textural and compositional reequilibration than previously thought. The reequilibrated magnetite has geochemical patterns that may be distinctively different from its precursor, making existing discrimination plots questionable when applied to genetic interpretation. Based on textural characterization and high-resolution in situ compositional analyses, we propose that the Fe versus V/Ti diagram can be more confidently used to discriminate between pristine igneous magnetite, reequilibrated magnetite, and hydrothermal magnetite.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Guang Wen, Jian-Wei Li, Albert H. Hofstra, Alan E. Koenig, Heather A. Lowers, David Adams,