Persistent Link:
http://hdl.handle.net/10150/191531
Title:
Prehnite dissociation curve below 3 kilobars water pressure.
Author:
Colony, Wayne E.
Issue Date:
1970
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Prehnite dissociates to form wollastonite, anorthite, and grossularite. The formation of the grossularite is considered as the result of the prehnite not being stoichiometric. Dissociation of prehnite occurs at 475ºC and 1000 bars water pressure. Kinetics prohibit obtaining experimental data below 800 bars water pressure I however the dissociation curve is extrapolated to low water pressures. This extrapolation is based on quantitative thermodynamic calculations. At low water pressures the curve becomes tangential to the H₂0-liquid H₂0-vapor phase boundary. Prehnite can form from CaO-Si0₂ metasomatism of Ca-rich plagioclase in nearly all rock types I including basalts, andesites, diorites, gabbros, diabases, graywackes, and volcanic sediments. Based on geologic evidence, prehnite in basalt amygdales must have formed at 1 atmosphere water pressure and less than 100ºC. The compositional dependence of the dissociation curve suggests that prehnite may not be a good index mineral to use in defining low-grade metamorphic facies. Further experimental work is required using mineral assemblages before prehnite can be used meaningfully as an index mineral.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Prehnite.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Geology; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Nordlie, Bert E.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titlePrehnite dissociation curve below 3 kilobars water pressure.en_US
dc.creatorColony, Wayne E.en_US
dc.contributor.authorColony, Wayne E.en_US
dc.date.issued1970en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractPrehnite dissociates to form wollastonite, anorthite, and grossularite. The formation of the grossularite is considered as the result of the prehnite not being stoichiometric. Dissociation of prehnite occurs at 475ºC and 1000 bars water pressure. Kinetics prohibit obtaining experimental data below 800 bars water pressure I however the dissociation curve is extrapolated to low water pressures. This extrapolation is based on quantitative thermodynamic calculations. At low water pressures the curve becomes tangential to the H₂0-liquid H₂0-vapor phase boundary. Prehnite can form from CaO-Si0₂ metasomatism of Ca-rich plagioclase in nearly all rock types I including basalts, andesites, diorites, gabbros, diabases, graywackes, and volcanic sediments. Based on geologic evidence, prehnite in basalt amygdales must have formed at 1 atmosphere water pressure and less than 100ºC. The compositional dependence of the dissociation curve suggests that prehnite may not be a good index mineral to use in defining low-grade metamorphic facies. Further experimental work is required using mineral assemblages before prehnite can be used meaningfully as an index mineral.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshPrehnite.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGeologyen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairNordlie, Bert E.en_US
dc.identifier.oclc213415317en_US
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