Geology of the Allan Creek area, Cariboo Mountains, British Columbia

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dc.contributor.advisorSimony, Philip S.
dc.contributor.authorCurrie, Lisel D.
dc.coverage.spatial2000002109en
dc.date.accessioned2005-07-21T22:36:13Z
dc.date.available2005-07-21T22:36:13Z
dc.date.issued1988
dc.descriptionBibliography: p. 125-139.en
dc.description.abstractThe Allan Creek area is divided into two tectonic domains by the steep north-west/southeast trending, southwest-side-down, post-metamorphic Allan Creek Normal Fault (ACF). Late Proterozoic Horsethief Creek and lower Kaza Group strata on the overturned limb of a phase one nappe, north of the ACF, are juxtaposed against lower and middle Kaza Group strata to the south, which belong to a higher level, upright limb of a phase one nappe. Fabrics on both sides of the fault preserve evidence for two major phases of folding, and north of the ACF there is evidence for a third phase of deformation. The second phase structures control the map pattern. They change in style, regardless of lithology, from isoclinal folds south of the ACF to more open folds north of the ACF. North of the ACF the Camp Creek Fault, which pre-dates the second phase of deformation, separates Horsethief Creek strata from younger, lower Kaza strata. South of the ACF, metamorphic grade increases northeastward from garnet grade to kyanite grade. The metamorphic grade north of the ACF, although still entirely in kyanite zone, is greater than in the south: leucosome is found only north of the ACF and the first appearance of leucosome corresponds with the trace of the ACF. Metamorphic histories differ across the ACF. South of the fault there is evidence for two distinct metamorphic events, whereas strata north of the fault may have experienced one continuous metamorphic event. On both sides of the ACF the peak of metamorphism post-dates the second phase of deformation. Retrogressive minerals are present only south of the ACF. North of the fault peak metamorphic mineral assemblages have been quenched and preserved in textural equilibrium. Pressures and temperatures determined by geobarometry and geothermometry from both sides of the fault (570 and 540 MPa, and 510°c and 540°c south and north of the ACF, respectively) are within error limits of one another, indicating that throw on the ACF may be less than 4 km. Preliminary U-Pb zircon and monazite age determinations of 154+/-6 Ma from a pegmatite that pre-dates phase two deformation, and 125+/-7 Ma from one that post-dates the second phase of deformation, constrain the age of phase two deformation to between 160 and 118 Ma (Late Jurassic to Early Cretaceous). The age of the metamorphic peak is inferred from a 135+/-4 Ma (Early Cretaceous) U-Pb monazite age from a pelite from north of the ACF. Since peak metamorphism post-dated phase two deformation, the age of phase two deformation in the Allan Creek area, north of the ACF, is further constrained to between 165 and 131 Ma. The timing of movement on the ACF post-dates the peak of metamorphism and is therefore later than 140 Ma. It is likely that the ACF formed to accommodate the northward decrease in offset on the Middle -Eocene North Thompson River-Albreda River Normal Fault, and therefore is also of Middle Eocene age.
dc.format.extentxviii, 152 leaves : ill. ; 30 cm.en
dc.identifier.citationCurrie, L. D. (1988). Geology of the Allan Creek area, Cariboo Mountains, British Columbia (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/19067en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/19067
dc.identifier.isbn0315504048en
dc.identifier.lccQE 187 C87 1988aen
dc.identifier.urihttp://hdl.handle.net/1880/24341
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.relationAdditional Copy: QE 187 C87 1988 c.01en
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 187 C87 1988aen
dc.subject.lcshGeology - British Columbia - Cariboo Mountains
dc.subject.lcshCariboo Mountains (B.C.)
dc.subject.lcshAllan Creek area (B.C.)
dc.titleGeology of the Allan Creek area, Cariboo Mountains, British Columbia
dc.typemaster thesis
thesis.degree.disciplineGeology and Geophysics
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.additionalcopyQE 187 C87 1988 c.01en
ucalgary.thesis.notesoffsiteen
ucalgary.thesis.uarcreleaseyen
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