Metamorphic, structural and stratigraphic evolution of the Telkwa Formation/: Zymoetz River area (NTS 103 I/8 and 93L/5), near Terrace, British Columbia

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dc.contributor.advisorGhent, Edward D.
dc.contributor.authorMihalynuk, M. G. (Mitchell George)
dc.coverage.spatial2000003241en
dc.date.accessioned2005-07-21T21:41:39Z
dc.date.available2005-07-21T21:41:39Z
dc.date.issued1987
dc.descriptionBibliography: p. 119-128.en
dc.description.abstractLate Triassic to Hid-Jurassic Hazelton Group volcanics underlie much of north-central British Columbia and are dominated by Late Triassic to Early Jurassic Telkwa Formation strata. The Telkwa Formation is important (a) from an economic standpoint as a host to precious metal mineralization; and (b) from a tectonic history perspective as a sequence overlapping allocthonous terranes amalgamated in the Late Triassic, and as a monitor of geologic evolution since that time. Telkwa Formation strata rest unconformably atop deformed Permian carbonates, which are among the oldest rocks in the Zymoetz River study area on the southern margin of the Bowser Basin. Subdivision of the Telkwa Formation into a lower intermediate to mafic member, variegated middle member, and an intermediate to felsic and tuffaceous upper member, enables correlation amongst five structural domains which comprise an eastward-dipping homocline. A western intrusive-dominated domain is bounded to the east by west-directed thrust faults involving Permian strata. The remainder of the study area is divided into four domains, primarily by major west-side-down normal faults interpreted to have 2-4km of stratigraphic throw. Limits of a domain along the southern margin of the area are poorly constrained. Deformation within eastern domains is mainly by smaller-scale (<700m) block faulting. Metamorphism of Telkwa Formation rocks generally increases in grade from zeolite to prehnite-pumpellyite facies with depth of burial, but also displays characteristics of contemporaneous and later hydrothermal events. Fluid inclusion composition and thermobarometry is generally consistent with the stability limits of observed authigenic minerals, as well as pressures inferred from the estimated thickness of overlying stratigraphy. Contact metamorphism at the base of the Permian carbonate occurred during Early Eocene intrusion. Garnet-biotite exchange thermometry, wollastonite equilibria, modelled conductive heating, fluid inclusion data, and estimates of the pressure due to overlying strata are all consistent with contact metamorphic P-T conditions of approximately 550°C and Pe20 approaching PFLuro-2Kb. Geothermal gradients within the middle and upper members prior to Eocene intrusion range from 30 to 45°C/km based on fluid inclusion data. Maximum geothermal gradients during and/or following Late Cretaceous to Eocene intrusive events are estimated from laumontite breakdown as between 45 and 85°C/km, but are not of regional extent. A geothermal gradient of 60°C/km is in agreement with local transitions from prehnite-pumpellyite facies to greenschist (epidote-actinolite) facies at the base of the Telkwa Formation. Uplift rates since the early Tertiary based on a 6 to 7km thick succession of Telkwa Formation volcanics averaged approximately 0.1 mm/year.en
dc.format.extentxiii, 128 leaves : ill., maps ; 30 cm.en
dc.identifier.citationMihalynuk, M. G. (1987). Metamorphic, structural and stratigraphic evolution of the Telkwa Formation/: Zymoetz River area (NTS 103 I/8 and 93L/5), near Terrace, British Columbia (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/11828en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/11828
dc.identifier.isbn0315360194en
dc.identifier.lccQE 651 M53 1987aen
dc.identifier.urihttp://hdl.handle.net/1880/23773
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.relationAdditional Copy: QE 651 M53 1987en
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 651 M53 1987aen
dc.subject.lcshFormations (Geology) - British Columbia
dc.subject.lcshTelkwa Formation (B.C.)
dc.subject.lcshGeology - British Columbia - Telkwa Formation
dc.titleMetamorphic, structural and stratigraphic evolution of the Telkwa Formation/: Zymoetz River area (NTS 103 I/8 and 93L/5), near Terrace, British Columbia
dc.typemaster thesis
thesis.degree.disciplineGeology and Geophysics
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.thesis.accessionTheses Collection 58.002:Box 628 520541711
ucalgary.thesis.additionalcopyQE 651 M53 1987en
ucalgary.thesis.notesoffsiteen
ucalgary.thesis.uarcreleaseyen
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