Sulfidation of synthetic biotites
| dc.contributor.author | Tso, Jonathan Lee | en |
| dc.contributor.department | Geological Sciences | en |
| dc.date.accessioned | 2015-07-28T20:42:19Z | en |
| dc.date.available | 2015-07-28T20:42:19Z | en |
| dc.date.issued | 1977 | en |
| dc.description.abstract | A series of hydrothermal experiments at 2000 bars have been conducted in order to investigate the systematic relation between biotite composition on the join phlogopite-annite and the composition of pyrrhotite. In an attempt to bracket the sulfide-silicate compositional pairs, three layers within a single capsule were used: 1) pyrite + Fe-rich biotite in the top, 2) sanidine + magnetite in the middle, and 3) troilite + Mg-rich biotite in the bottom. At the conclusion of a bracketing run, the biotite in the top was found to have become more Mg-rich and the biotite in the bottom was found to have become more Fe-rich while a pyrrhotite of apparently homogeneous composition was found throughout the capsule. Five equilibrium determinations at 700°C have been located: (N)<sub>Po</sub> = 0.928, (Fe/(Fe + Mg))<sub>Bi</sub> = 0.496 0.936 0.530 0.945 0.541 0.947 0.581 0.950 0.585 The data demonstrate that biotites tend to become more Mg-enriched with increasingly sulfur-rich compositions of pyrrhotite. This study can be applied to natural systems in which a pyrrhotite-biotite-magnetite-K-spar assemblage is present. Since sulfides have been observed to re-equilibrate at lower temperatures while the composition of the Fe-Mg silicates still mirror the conditions of metamorphism, silicate compositions can potentially be used as a measure of f<sub>S₂</sub> and f<sub>O₂</sub>. From this, one can attempt to calculate the properties of the vapor during the alteration of the silicates and ore genesis. | en |
| dc.description.degree | Master of Science | en |
| dc.format.extent | iii, 55 leaves | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.uri | http://hdl.handle.net/10919/54875 | en |
| dc.language.iso | en_US | en |
| dc.publisher | Virginia Polytechnic Institute and State University | en |
| dc.relation.isformatof | OCLC# 8041118 | en |
| dc.rights | In Copyright | en |
| dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
| dc.subject.lcc | LD5655.V855 1977.T85 | en |
| dc.subject.lcsh | Biotite | en |
| dc.title | Sulfidation of synthetic biotites | en |
| dc.type | Thesis | en |
| dc.type.dcmitype | Text | en |
| thesis.degree.discipline | Geological Sciences | en |
| thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
| thesis.degree.level | masters | en |
| thesis.degree.name | Master of Science | en |
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