Unusual noble gas compositions in polycrystalline diamonds: preliminary results from the Jwaneng kimberlite, Botswana

Honda, Masahiko; Phillips, David; Harris, Jeffrey W.; Yatsevich, Igor

doi:10.1016/j.chemgeo.2003.10.012

Cited by 31 publications

(12 citation statements)

References 43 publications

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“…Honda et al, 1993Honda et al, , 2004. In contrast, this is the first study to report Ne isotope analysis with the MAP-215 noble gas mass spectrometer at the University of Melbourne.…”

Section: Noble Gas Analysiscontrasting

confidence: 52%

The noble gas systematics of late-orogenic H2O–CO2 fluids, Mt Isa, Australia

Kendrick

Honda

Oliver

et al. 2011

Geochimica et Cosmochimica Acta

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“…Honda et al, 1993Honda et al, , 2004. In contrast, this is the first study to report Ne isotope analysis with the MAP-215 noble gas mass spectrometer at the University of Melbourne.…”

Section: Noble Gas Analysiscontrasting

confidence: 52%

The noble gas systematics of late-orogenic H2O–CO2 fluids, Mt Isa, Australia

Kendrick

Honda

Oliver

et al. 2011

Geochimica et Cosmochimica Acta

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“…Based on the geochemical indicators for the formation of the polycrystalline diamonds, some researchers invoke the subduction of the ocean floor and its subsequent mixing with the upper mantle lithosphere as a mechanism for the framesite crystallization [10,11]. Some researchers suggest the remobilization of older carbon and silicate components to form the framesites shortly before the kimberlite eruption [7].…”

Section: Introductionmentioning

confidence: 99%

A Microscopy and FTIR and PL Spectra Study of Polycrystalline Diamonds from Mengyin Kimberlite Pipes

et al. 2012

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The results of a microscopy and FTIR and PL spectra study of the natural polycrystalline diamonds from the Mengyin kimberlite pipes show that they can be classified as the euhedral faceted polycrystalline diamonds (EFPCDs) and anhedral rounded polycrystalline diamonds (ARPCDs). Different diamond grains or their points were formed in different conditions or processes. They were not formed in diamond nucleation stage, but in the diamond growth period. They probably originated from the relatively deeper mantle and were formed in the environment like the peridotitic (P) type diamond single crystals. The EFPCDs did not undergo a remarkable dissolution process during their formation and were possibly fast formed shortly before the kimberlite eruption. The ARPCDs not only were formed at a higher temperature than the EFPCDs but also underwent a notable dissolution process and had been stored relatively longer in the mantle. Fluids or melts probably participated in the formation of the ARPCDs or modified them during the period of their storage in the mantle.

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“…So, while the vesicles generated later have more of the MORB component, the earlier formed vesicles that have more time to grow have a larger fraction of air component released during early melting of subducted matter. From recent study on polycrystalline diamonds, it has been proposed that noble gases, including Ne are added to the mantle during subduction processes (Honda et al, 2003). Here, we propose that the melting of the subducted slab must have occurred at considerably shallow depths as subduction of atmospheric Ne to the very deep mantle is unlikely.…”

Section: Trapped Components: Enriched Lithospheric Subducted and Deementioning

confidence: 91%

“…So, in the present case, it seems more likely that the observed higher ratios of 40 Ar/ 36 Ar, 21 Ne/ 20 Ne and 22 Ne/ 20 Ne are due to the presence of an enriched lithospheric mantle component. Very high 40 Ar/ 36 Ar ratios up to 53070 ± 2871 have been observed in Jwaneng diamonds (Honda et al, 2003). The consistency in halogen and noble gas abundances between diamonds (including those from Jwaneng) and MORB samples have led Johnson et al (2000) to suggest MORB-like mantle source for the lithospheric volatiles.…”

Section: Trapped Components: Enriched Lithospheric Subducted and Deementioning

confidence: 94%