Quantifying the Pressure, Temperature, and Timing of Metamorphism in the Montresor Belt, Nunavut, Canada

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Creator: 

Dziawa, Carolyn

Date: 

2016

Abstract: 

P-T-t conditions are determined for the Montresor belt (Rae Province, Nunavut) using modern thermodynamic modeling and in-situ U-Th-Pb monazite geochronology. Phase equilibrium modeling yields peak P-T estimates of 355 - 455°C and <4200 bar for the upper Montresor belt and 500 - 580°C and <4000 bar for the lower Montresor belt, with a high geothermal gradient of ca. 57°C/km during metamorphism. Forward modeling of garnet crystallization suggests growth along a clockwise, nearly isobaric P-T path from ca. 539 – 544°C and 3090 – 3140 bar. Chemical age dating of metamorphic monazite indicates peak P-T conditions occurred at ca. 1837 ± 8.6 Ma. Altered monazite domains suggest a fluid-mediated alteration event during cooling at ca. 1792 ± 10.1 Ma, associated with the emplacement of dykes into the lower Montresor group. These fluids increased the bulk rock K and caused modification to garnet growth zoning and mechanical fracturing of garnet.

Language: 

English

Publisher: 

Carleton University

Thesis Degree Name: 

Master of Science: 
M.Sc.

Thesis Degree Level: 

Master's

Thesis Degree Discipline: 

Earth Sciences

Parent Collection: 

Theses and Dissertations

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