Noble gas emplacement in shock-produced diamonds

Journal Article · Mon May 01 04:00:00 EDT 1989 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(89)90217-2· OSTI ID:5020747

Matsuda, Junichi ^[1]; Nagao, Keisuke ^[2]

---

1. Kobe Univ. (Japan)
2. Okayama Univ., Misasa (Japan)

Amounts of noble gases in shock-produced diamonds were considerably higher than those in the raw material graphite, and their elemental ratios were similar to those of air. It is evident that the shock-produced diamonds trapped the noble gases, without significant mass fractionation, from the atmosphere during the phase transition. These noble gases were mainly released at temperatures within the range of 1,700 to 2,000{degree}C, suggesting that noble gases were tightly incorporated within the diamonds and were being released during graphitization. A diamond synthesized under hydrostatic pressure was found to have noble gas abundances much lower than those in the shock-produced diamonds. The elemental abundances of noble gases in shock-produced diamonds are discussed in relation to those in ureilite diamonds.

• OSTI ID: 5020747
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 53:5; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ABUNDANCE
CARBON
CHEMICAL COMPOSITION
CHEMISTRY
COMPARATIVE EVALUATIONS
DIAMONDS
ELEMENT ABUNDANCE
ELEMENTAL MINERALS
ELEMENTS
FLUIDS
GASES
GEOCHEMISTRY
GRAPHITE
MINERALIZATION
MINERALS
NONMETALS
ORIGIN
RARE GASES
TEKTITES