Low-grade metamorphism of proterozoic rocks from the Esplanade Range, British Columbia

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dc.contributor.advisorGhent, Edward D.
dc.contributor.authorJones, Jonathan W.
dc.coverage.spatial2000002251en
dc.date.accessioned2005-07-19T20:19:29Z
dc.date.available2005-07-19T20:19:29Z
dc.date.issued1970
dc.descriptionBibliography: p. 95-100.en
dc.description.abstractThe lithology and petrography of the Horsethief Creek Group of the Esplanade Range and adjacent areas is discussed. The mineral assemblages from zones lower in metamorphic grade than the almandine zone are described and certain mineral compositions determined. The most significant mineral assemblages present are: 1) Muscovite - chlorite - quartz 2A Muscovite - chlorite - quartz 3A Muscovite - chlorite 4) Muscovite - chlorite - quartz - paragonite 5) Muscovite - chlorite - quartz - paragonite - chloritoid 6) Muscovite - chlorite - quartz - albite - epidote 7) Doiomite - muscovite - chlorite - quartz 8) Muscovite - chlorite - quartz - siderite These assemblages are indicative of greenschist facies metamorphism and are characteristic of the biotite zone. Biotite is very rare and its occurence is strongly controlled by bulk chemical composition. The feldspar in feldspathic assemblages is almost entirely albite. Potassium feldspar (microcline) was identified in one sample only and it may be that some plagioclase is albitized potassium feldspar. X-ray data indicate that the feldspar has a low structural state. From x-ray data, chemical analysis of a muscovite-rich sample, and some refractive index measurements, it is concluded that the potassium micas are phengitic. X-ray data suggests that the Al content of of chlorites from various mineral assemblages does not vary much, and that the Fe content of the chlorites is consistently high. Physical conditions during metamorphism are determined and the relative importance of bulk chemical composition and physical conditions discussed. A temperature of approximately 400°C during metamorphism is suggested on the basis of the Mg content of calcite which coexists with dolomite. Load pressure during metamorphism is estimated from structural considerations to have been in the range 2.7 kb to 5.5 kb. Estimates of fo2, fS2, and fco2 are made by comparing the mineral ass­emblages present to experimentally studied systems. Graphite is a common and extremely important phase.
dc.description.notesThis title is not available online. Access options are: - consulting the copy from Archives in our reading room in person - https://asc.ucalgary.ca/visiting/ - borrowing a circulating copy from the Library catalogue – https://ucalgary.primo.exlibrisgroup.com/discovery/search?vid=01UCALG_INST:UCALGARY&lang=en
dc.format.extent112 leaves : ill. ; 30 cm.en
dc.identifier82481525en
dc.identifier.citationJones, J. W. (1970). Low-grade metamorphism of proterozoic rocks from the Esplanade Range, British Columbia (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/17666en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/17666
dc.identifier.lccQE 475 J64 1969en
dc.identifier.other82481525en
dc.identifier.urihttp://hdl.handle.net/1880/13776
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.relationAdditional Copy: QE 475 J64 1969G GEOLOGYen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lccQE 475 J64 1969en
dc.subject.lcshRocks, Metamorphic
dc.subject.lcshPetrology - British Columbia - Esplanade Range
dc.titleLow-grade metamorphism of proterozoic rocks from the Esplanade Range, British Columbia
dc.typemaster thesis
thesis.degree.disciplineGeology
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.thesis.accessionTheses Collection 58.002:Box 56 82481533
ucalgary.thesis.additionalcopyQE 475 J64 1969G GEOLOGYen
ucalgary.thesis.notesPLen
ucalgary.thesis.uarcreleasenoen
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