Episodic diamond genesis at Jwaneng, Botswana, and implications for Kaapvaal craton evolution

Richardson, Sylvia O.

doi:10.1016/s0024-4937(04)00149-5

Cited by 8 publications

(14 citation statements)

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“…BMS added at this time were eclogitic and preferentially added in the west, explaining both the timing and distribution of 2.9 Ga eclogitic diamond growth (Shirey et al 2004aAulbach et al 2009a). Subsequent repeated episodes of sulfide re-introduction into the lithosphere accompanying metasomatism and marginal subduction are documented by peridotitic BMS grains in mantle xenoliths and xenocrysts ) and multiple episodes of Proterozoic diamonds with eclogitic sulphides (e.g., Pearson et al 1998;Richardson et al 2004;Aulbach et al 2009b). The few examples of peridotitic BMS-containing diamonds in the Kaapvaal craton have proved to be young.…”

Section: The Age Of the Continental Lithospheric Mantle And The Assemmentioning

confidence: 86%

“…Osmium concentrations are often several orders of magnitude lower than peridotitic BMS, e.g., < 1.5 µg·g −1 (e.g., Pearson et al 1998;Pearson and Shirey 1999;Aulbach et al 2009a), while rhenium contents are only moderately lower in eclogitic BMS than peridotitic BMS (≤ 2.2 µg·g Os are also high (often > 100; e.g., Pearson et al 1998, Aulbach et al 2009a and sometimes exceptionally high (> 1500; Richardson et al 2004 …”

Section: Diamond-hosted Sulfidesmentioning

confidence: 99%

“…This technique produced the first successful date on a suite of diamonds from Koffiefontein, South Africa ). Since then this has been the preferred method for the dating of diamond formation (e.g., Pearson et al 1999a,b;Pearson and Shirey 1999;Richardson et al 2001Richardson et al , 2004Richardson et al , 2009Shirey et al 2001Shirey et al , 2002Aulbach et al 2004aAulbach et al ,b, 2009aAulbach et al ,b,c, 2011Westerlund et al 2004Westerlund et al , 2006Smit et al 2010).…”

Section: Dating the Formation Of Diamondsmentioning

confidence: 99%

“…This review represents the first time that BMS in mantle rocks and diamonds are discussed together for the purposes of age determination. The interested reader should also consult other articles that have discussed these topics individually (e.g., Shirey and Walker 1998;Burton et al 1999Burton et al , 2012Pearson and Shirey 1999;Luguet et al 2001Luguet et al , 2003Luguet et al , 2004Luguet et al , 2007Luguet et al , 2008; Richardson et al 2001Richardson et al , 2004Richardson et al , 2009Shirey et al 2001Shirey et al , 2002Shirey et al , 2004aShirey et al ,b, 2013Alard et al 2002Alard et al , 2005Aulbach et al 2004aAulbach et al ,b, 2009aAulbach et al ,b,c, 2011Harvey et al 2006Harvey et al , 2010Harvey et al , 2011 …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mantle Sulfides and their Role in Re–Os and Pb Isotope Geochronology

Harvey¹,

Warren²,

Shirey³

2016

Highly Siderophile and Strongly Chalcophile Elements in High-Temperature Geochemistry and Cosmochemistry

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Section: The Age Of the Continental Lithospheric Mantle And The Assemmentioning

confidence: 86%

Section: Diamond-hosted Sulfidesmentioning

confidence: 99%

Section: Dating the Formation Of Diamondsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mantle Sulfides and their Role in Re–Os and Pb Isotope Geochronology

Harvey¹,

Warren²,

Shirey³

2016

Highly Siderophile and Strongly Chalcophile Elements in High-Temperature Geochemistry and Cosmochemistry

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“…Diamonds are generally considered to be robust containers for these inclusions, effectively shielding them chemically during their ascent to the Earth's surface and preserving their composition. Inclusions are generally thought to have been formed syngenetically with the host diamond (as indicated by the imposed diamond morphology of the inclusions e.g., Sobolev, 1977;Meyer, 1987;Bulanova, 1995;Richardson et al, 2001Richardson et al, , 2004 -although see Taylor and Anand, 2004;Agrosì et al, 2016;Nestola et al, 2017 for a different viewpoint) and their study thus allows us an insight into mantle geochemistry, geodynamics, and diamond mineralisation processes that cannot be achieved by other means.…”

Section: Introductionmentioning

confidence: 99%

Homogenisation of sulphide inclusions within diamonds: A new approach to diamond inclusion geochemistry

McDonald

Hughes

Butler

et al. 2017

Geochimica et Cosmochimica Acta

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Base metal sulphide (BMS) inclusions in diamonds provide a unique insight into the chalcophile and highly siderophile element composition of the mantle. Entombed within their diamond hosts, these provide a more robust (closed system) sample, from which to determine the trace element, Re-Os and S-isotopic compositions of the mantle than mantle xenoliths or orogenic peridotites, as they are shielded from alteration during ascent to the Earth's crust and subsequent surface weathering. However, at temperatures below 1100°C some BMS inclusions undergo subsolidus re-equilibration from an original monosulphide solid solution (Mss) and this causes fractionation of the major and trace elements within the inclusions. Thus to study the subjects noted above, current techniques require the entire BMS inclusion to be extracted for analyses. Unfortunately, 'flaking' of inclusions during break-out is a frequent occurrence and hence the risk of accidentally under-sampling a portion of the BMS inclusion is inherent in current practices. This loss may have significant implications for Re-Os isotope analyses where incomplete sampling of a Re-rich phase, such as chalcopyrite that typically occurs at the outer margins of BMS inclusions, may induce significant bias in the Re-Os and 187 Os/ 188 Os measurements and resulting model and isochron ages. We have developed a method for the homogenisation of BMS inclusions in diamond prior to their break-out from the host stone. Diamonds are heated to 1100°C and then quenched to chemically homogenise any sulphide inclusions for both major and trace elements. Using X-ray Computed Microtomography (mCT) we determine the shape and spatial setting of multiple inclusions within a host stone and crucially show that the volume of a BMS inclusion is the same both before and after homogenisation. We show that the homogenisation process significantly reduces the inherent variability of in situ analysis when compared with unhomogenised BMS, thereby widening the scope for multiple methods for quantitative analysis, even on 'flakes' of single BMS inclusions. Finally we show that the trace elements present in peridotite (P-type) and eclogitic (E-type) BMS are distinct, with P-type diamonds having systematically higher total platinum-group element (particularly Os, Ir, Ru) and Te and As concentrations. These distinctions suggest that the PGE and semi-metal budgets of mantle-derived partial melts will be significantly dependent upon the type(s) and proportions of sulphides present in the mantle source.

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Sm-Nd isochron ages coupled with C-N isotope data of eclogitic diamonds from Jwaneng, Botswana

Gress

Koornneef

Thomassot

et al. 2021

Geochimica et Cosmochimica Acta

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Episodic diamond genesis at Jwaneng, Botswana, and implications for Kaapvaal craton evolution

Cited by 8 publications

References 0 publications

Mantle Sulfides and their Role in Re–Os and Pb Isotope Geochronology

Mantle Sulfides and their Role in Re–Os and Pb Isotope Geochronology

Homogenisation of sulphide inclusions within diamonds: A new approach to diamond inclusion geochemistry

Sm-Nd isochron ages coupled with C-N isotope data of eclogitic diamonds from Jwaneng, Botswana

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