Tracking fluid/melt flow in lower crustal mafic gneiss using zircon isotopic zoning, kapuskasing uplift

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Title Tracking fluid/melt flow in lower crustal mafic gneiss using zircon isotopic zoning, kapuskasing uplift
Publication Type thesis
School or College College of Mines & Earth Sciences
Department Geology & Geophysics
Author Hilber, Melinda Dawn
Date 2010
Description Coordinated cathodoluminescence (CL) imaging and ion microprobe (SHRIMP and CAMECA 1280) analysis (U-Pb dating, oxygen isotope and trace element) of metamorphic zircon from a granulite-facies mafic orthogneiss in the Kapuskasing Uplift of the Archean Superior Province reveal episodes of fluid-rock interaction. Metamorphic zircon grains were isolated from six sample sites along a 10 m traverse away from contact with a high ?18O paragneiss unit. CL images reveal that most zircons have bright cores surrounded by darker rims. The 207Pb/206Pb ages of metamorphic zircons generally range from 2660 to 2550 Ma. Age differences between cores and rims are not always resolvable within the analytical precision of SHRIMP measurements (± 8 to 247 Ma, 2sd) due to very low U concentrations in many zircon cores. Ages do not vary systematically with distance across the traverse.
Type Text
Publisher University of Utah
Subject Superior Province; Superior craton; Kapusksasing Uplift; Ion microprobe; Metamorphism; Oxygen isotopes; Ti thermometer; U-Pb geochronology; Zircon; Isotopic zoning; Mafic gneiss
Subject LCSH Geology -- Ontario; Gneiss -- Ontario
Dissertation Institution University of Utah
Dissertation Name MS
Language eng
Rights Management ©Melinda Dawn Hilber
Format application/pdf
Format Medium application/pdf
Format Extent 16,248,971 bytes
Source Original in Marriott Library Special Collections, QE3.5 2010 .H55
ARK ark:/87278/s6q5344b
Setname ir_etd
ID 192744
Reference URL https://collections.lib.utah.edu/ark:/87278/s6q5344b