Eclogitic diamond formation at Jwaneng: No room for a recycled component

被引：145

作者：

Cartigny, P

Harris, JW

Javoy, M

机构：

[1] Univ Paris 07, Inst Phys Globe Paris, Lab Geochim Isotopes Stables, F-75251 Paris, France

[2] Univ Glasgow, Dept Geol & Appl Geol, Glasgow G12 8QQ, Lanark, Scotland

来源：

SCIENCE | 1998年 / 280卷 / 5368期

关键词：

D O I：

10.1126/science.280.5368.1421

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Eclogitic diamonds have a large range of delta(13)C values, whereas peridotitic diamonds do not. Paired delta(15)N-delta(13)C-N variations in 40 eclogitic diamonds from the Jwaneng kimberlite in Botswana show that neither the influence of recycled biogenic carbon nor the global and primordial heterogeneity of mantle carbon are likely for the origin of the large delta(13)C range; the data instead support a fractionation process. It is proposed that carbonatitic mantle melts from which diamonds crystallize undergo different evolutions before diamond precipitation, when percolating through either a peridotite or an eclogite. These different evolutions, reflecting the presence or absence of olivine, can account for their respective delta(13)C distributions.

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页码：1421 / 1424

页数：4

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