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Permanent link (DOI): https://doi.org/10.7939/R39Z90K0B

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Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds Open Access

Descriptions

Other title
Subject/Keyword
Hall Peninsula
Carbon isotopes
Diamond
Chidliak
Nitrogen isotopes
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Nichols, Katie M.A.
Supervisor and department
Stachel, Thomas (Earth and Atmospheric Sciences)
Examining committee member and department
Li, Long (Earth and Atmospheric Sciences)
Stachel, Thomas (Earth and Atmospheric Sciences)
Pearson, Graham (Earth and Atmospheric Sciences)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2014-01-15T15:30:52Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
Diamonds from the Chidliak kimberlite field, located on the Hall Peninsula of Baffin Island, are the focus of this study. Morphology, carbon and nitrogen isotopic compositions, and nitrogen characteristics of Chidliak diamonds are used to constrain diamond sources, and conditions of diamond formation and preservation. Strong variations in δ13C and nitrogen content across growth layers indicate that at least two diamond growth events occurred, interrupted by resorption. Diamond mantle residence temperatures range from ~980 to 1350°C, equivalent to a depth range of ~150-200 km. Stable isotopic analyses indicate that diamond formation occurred principally from fluids or melts with a dominant mantle signature (modes in δ13C of -6‰ and δ15N of -3‰), but contribution of a subducted crustal component is also apparent (13C depleted and 15N enriched samples). Combined with observations of overall high nitrogen contents (≤3830 atomic ppm), Chidliak diamond characteristics suggest derivation (partially or completely) from eclogitic mantle sources.
Language
English
DOI
doi:10.7939/R39Z90K0B
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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