Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds
Degree: Master of Science 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...
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University of Alberta. Department of Earth and Atmospheric Sciences.
2014
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fttriple:oai:gotriple.eu:10402/era.37682 2023-05-15T15:35:23+02:00 Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds Nichols, Katie M.A. Stachel, Thomas (Earth and Atmospheric Sciences) Pearson, Graham (Earth and Atmospheric Sciences) Li, Long (Earth and Atmospheric Sciences) 2014-01-15 http://hdl.handle.net/10402/era.37682 en eng University of Alberta. Department of Earth and Atmospheric Sciences. 10402/era.37682 http://hdl.handle.net/10402/era.37682 other ERA : Education and Research Archive geo envir Thesis https://vocabularies.coar-repositories.org/resource_types/c_46ec/ 2014 fttriple 2023-01-22T18:35:59Z Degree: Master of Science 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. Thesis Baffin Island Baffin Hall Peninsula Nunavut Unknown Baffin Island Nunavut |
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geo envir Nichols, Katie M.A. Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds |
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Degree: Master of Science 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. |
author2 |
Stachel, Thomas (Earth and Atmospheric Sciences) Pearson, Graham (Earth and Atmospheric Sciences) Li, Long (Earth and Atmospheric Sciences) |
format |
Thesis |
author |
Nichols, Katie M.A. |
author_facet |
Nichols, Katie M.A. |
author_sort |
Nichols, Katie M.A. |
title |
Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds |
title_short |
Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds |
title_full |
Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds |
title_fullStr |
Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds |
title_full_unstemmed |
Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds |
title_sort |
diamond sources beneath the hall peninsula, baffin island, nunavut: a preliminary assessment based on chidliak diamonds |
publisher |
University of Alberta. Department of Earth and Atmospheric Sciences. |
publishDate |
2014 |
url |
http://hdl.handle.net/10402/era.37682 |
geographic |
Baffin Island Nunavut |
geographic_facet |
Baffin Island Nunavut |
genre |
Baffin Island Baffin Hall Peninsula Nunavut |
genre_facet |
Baffin Island Baffin Hall Peninsula Nunavut |
op_source |
ERA : Education and Research Archive |
op_relation |
10402/era.37682 http://hdl.handle.net/10402/era.37682 |
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other |
_version_ |
1766365724106817536 |