High-density fluid microinclusion-bearing diamonds from the De Beers Pool and Finsch mines, South Africa

Weiss, Yaakov
Kiro, Yael
Class, Cornelia
Winckler, Gisela
Harris, Jeff W
Goldstein, Steve L
Fifteen microinclusion-bearing fibrous diamonds from the De Beers Pool and Finsch kimberlites, South Africa, were analyzed for their major and trace element, He isotopic compositions, and nitrogen content and aggregation state. High-density fluid (HDF) microinclusions of saline compositions were found in 9 of the diamonds, silicic compositions in 1 diamond and carbonatitic in 4 diamonds. Some of the diamonds encapsulate also micro-mineral inclusions, and one diamond did not contain HDFs but rather only micro-mineral inclusions. All HDFs are enriched in incompatible elements; the fractionated nature of these patterns is more pronounced in the carbonatitic HDFs. 3He/4He isotopic ratios in the saline HDFs are 2.66-4.43 (Ra normalized) compared to 0.07-0.69 in the diamonds with silicic and carbonatitic HDF compositions.
How to cite this dataset:
Weiss, Y., Kiro, Y., Class, C., Winckler, G., Harris, J. W., Goldstein, S. L., 2021. High-density fluid microinclusion-bearing diamonds from the De Beers Pool and Finsch mines, South Africa, Version 1.0. Interdisciplinary Earth Data Alliance (IEDA). https://doi.org/10.26022/IEDA/111776. Accessed 2024-04-25.
DOI Creation Date:
Yaakov Weiss, Yael Kiro, Cornelia Class, Gisela Winckler, Jeff W. Harris, Steven L. Goldstein; Helium in diamonds unravels over a billion years of craton metasomatism; under review.

Weiss, Y., Goldstein, S.L., 2018. The involvement of diamond-forming fluids in the metasomatic ‘cocktail’ of kimberlite sources. Mineralogy and Petrology, 1-19.

Weiss, Y., Navon, O., Goldstein, S.L., Harris, J.W., 2018. Inclusions in diamonds constrain thermo-chemical conditions during Mesozoic metasomatism of the Kaapvaal cratonic mantle. Earth and Planetary Science Letters 491, 134-147.
Creative Commons Attribution-ShareAlike 4.0 International [CC-BY-SA-4.0]
Funding source(s):
ISF grant No. 2015/18
National Science Foundation: 1348045
National Science Foundation: 1725323
Coverage Scope: Regional (Continents, Oceans)
Geographic Location: South Africa
User Contributed Keyword(s):
Diamonds, Inclusions, High-density fluids, U-Th/He dating, Major elements, Trace elements, Helium
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