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Skip to Search Results- 6Lai, Mei Yan
- 3Stachel, Thomas
- 3Stern, Richard A.
- 1Cartigny, Pierre
- 1Creighton, Steven
- 1Hardman, Matthew F.
- 13Graduate and Postdoctoral Studies (GPS), Faculty of
- 13Graduate and Postdoctoral Studies (GPS), Faculty of /Theses and Dissertations
- 6Earth and Atmospheric Sciences, Department of
- 4Earth and Atmospheric Sciences, Department of/Research Materials (Earth and Atmospheric Sciences)
- 2Earth and Atmospheric Sciences, Department of/Journal Articles (Earth and Atmospheric Sciences)
- 1Canadian Centre for Isotopic Microanalysis (CCIM)
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Age, origin and composition of the Attawapiskat lithospheric mantle and its diamonds (western Superior craton, Canada)
DownloadFall 2013
This study reports results from peridotitic and eclogitic xenoliths and di- amond samples from the Attawapiskat area to understand the processes of craton formation and modification in the Superior lithospheric mantle. These diamondiferous kimberlites also provide an opportunity to study the...
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Biogenic and Abiotic Carbonates in Altered Oceanic Crust (AOC) and Implications to Subduction Zone Carbon Cycle
DownloadFall 2017
Altered oceanic crust (AOC) is an important carbon reservoir for subduction-zone carbon recycling. However, the character of the carbon reservoir (e.g., total budget and isotopic signatures) in AOC has not been well constrained. Here, based on analyses of contents and isotope compositions of 73...
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Carbon and nitrogen isotope systematics in diamond: Different sensitivities to isotopic fractionation or a decoupled origin?
Download2016-11-16
Hogberg, Katie, Stachel, Thomas, Stern, Richard A.
Using stable isotope data obtained on multiple aliquots of diamonds from worldwide sources, it has been argued that carbon and nitrogen in diamond are decoupled. Here we re-investigate the carbon–nitrogen relationship based on the most comprehensive microbeam data set to date of stable isotopes...
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Cathodoluminescence images of Koidu diamonds
2022-09-01
Cathodoluminescence images of Koidu diamonds
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Fall 2011
The Renard kimberlites (52°48’26N, 72°14’52W: Quebec, Canada) are typical for primary diamond deposits: being located within Archean basement (Superior craton). Pb-Pb isotope data of clinopyroxenes also suggests an Archean age (~2.7Ga) for the subcratonic lithospheric mantle (SCLM). The Carolina...
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Descriptions of Koidu diamonds and their mineral inclusions
2022-09-01
Descriptions of Koidu diamonds and their mineral inclusions
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Diamond sources beneath the Hall Peninsula, Baffin Island, Nunavut: A preliminary assessment based on Chidliak diamonds
DownloadSpring 2014
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...
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Fall 2013
Monocrystalline gem-quality diamonds from Akwatia, Ghana and De Beers Pool, South Africa have trace-element concentrations ranging from ppt to ppm levels, but mostly are below the limit of quantification. CeN/EuN (1–6; N = chondrite normalized) and CeN/TiN (0.6 to 12) indicate mildly elevated...
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Formation of mixed paragenesis diamonds during multistage growth – constraints from in situ δ 13C–δ 15N–[N] analyses of Koidu diamonds
Download2022-01-01
Lai, Mei Yan, Stachel, Thomas, Stern, Richard A., Hardman, Matthew F., Pearson, D. Graham, Harris, Jeff W.
Abstract Inclusion-bearing diamonds from the Koidu kimberlite complex, Sierra Leone (West African Craton) were analyzed in situ for carbon and nitrogen isotope compositions, nitrogen concentrations and nitrogen aggregation states. In a suite of 105 diamonds, 78% contain eclogitic mineral...
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Geochemistry of diamonds and their mineral inclusions constraining the composition of the lithospheric mantle and recycling of crustal materials
DownloadFall 2022
Bimineralic eclogite xenoliths from Koidu have been extensively studied previously, but less attention has been directed towards diamondiferous eclogite xenoliths as well as eclogitic and peridotitic diamonds from this locality. To gain insight into the geologic history of the lithospheric mantle...