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dc.contributor.advisorHenderson, Charles M.
dc.contributor.advisorMatthews, William A.
dc.contributor.authorMadronich, Lauren Isobelle
dc.date2019-06
dc.date.accessioned2019-02-08T21:54:47Z
dc.date.available2019-02-08T21:54:47Z
dc.date.issued2019-02-08
dc.identifier.citationMadronich, L. I. (2019). Detrital zircon U-Pb ages and trace element compositions from Cambrian rocks of western North America (Unpublished master's thesis). University of Calgary, Calgary, AB.en_US
dc.identifier.urihttp://hdl.handle.net/1880/109892
dc.description.abstractThe evolution of the western margin of Laurentia (present coordinates), associated with the disassembly of supercontinent Rodinia, comprises a greater than 200 Myr rift history. Neoproterozoic and Cambrian zircons found in Cambrian units across western North America are used to supplement the igneous record of rift-related magmatic activity along the margin and provide timing constraints for continental rifting. Zircons were measured by LA-ICP-MS through three rounds of ablation: (1) screening round to identify Neoproterozoic and Cambrian grains; (2) trace element round; (3) higher-precision age round. U-Pb ages and trace element compositions detrital zircons are used to define two episodes of rift-related magmatism and are used to test and revise models of Rodinia’s disassembly. The first episode includes late Tonian 780-720 Ma mafic magmatism related to the initial crustal thinning followed by mafic and intermediate magmatism within Cryogenian (720-635 Ma) rift basins. Apparent magmatic quiescence from 630 to 580 Ma coincides with margin-wide subsidence. The second episode of magmatism (580 to 520 Ma) is related to resumed rift tectonism and is followed by the establishment of the lower Paleozoic passive margin of western Laurentia (Sauk transgressive sequence). Cambrian zircon populations (near-depositional age zircons) provide important radiometric constraints on the timing of the Sauk transgression that marks the final breakup of Rodinia.en_US
dc.language.isoenen_US
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.en_US
dc.subjectRodiniaen_US
dc.subjectLaurentiaen_US
dc.subjectSauk sequenceen_US
dc.subjectdetrital zirconen_US
dc.subjectU-Pb geochronologyen_US
dc.subjectzircon trace element contenten_US
dc.subjectcontinental riftingen_US
dc.subjecttectonicsen_US
dc.subject.classificationGeochemistryen_US
dc.subject.classificationGeologyen_US
dc.titleDetrital zircon U-Pb ages and trace element compositions from Cambrian rocks of western North Americaen_US
dc.typemaster thesisen_US
dc.publisher.facultyScienceen_US
dc.publisher.institutionUniversity of Calgaryen
thesis.degree.nameMaster of Science (MSc)en_US
thesis.degree.disciplineGeoscienceen_US
thesis.degree.grantorUniversity of Calgaryen_US
dc.contributor.committeememberPattison, David R. M.
dc.contributor.committeememberMcMechan, Margaret E.


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