Sulfidation of synthetic biotites

dc.contributor.authorTso, Jonathan Leeen
dc.contributor.departmentGeological Sciencesen
dc.date.accessioned2015-07-28T20:42:19Zen
dc.date.available2015-07-28T20:42:19Zen
dc.date.issued1977en
dc.description.abstractA 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.degreeMaster of Scienceen
dc.format.extentiii, 55 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/54875en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 8041118en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1977.T85en
dc.subject.lcshBiotiteen
dc.titleSulfidation of synthetic biotitesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineGeological Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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