Rare earth element patterns of carbonado and yakutite: evidence for their crustal origin

K. Shibata, H. Kamioka, F. V. Kaminsky, V. I. Koptil, D. P. Svisero

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Carbonado and yakutite are both porous aggregates of polycrystalline micrometre-size diamond, with very different characters from those of monocrystalline diamond. The genesis of carbonado is very controversial, whereas yakutite is thought to have been formed by meteorite impact. Neutron activation analyses of trace elements in carbonado and yakutite indicate that their rare earth element (REE) abundance patterns have common characteristics: heavy REEs are not much depleted and a negative Eu anomaly is observed. These patterns are quite different from those of kimberlite and monocrystalline diamond and are similar to those of crustal materials such as shale, supporting the hypothesis of a crustal origin for carbonado and yakutite. -Authors

Original languageEnglish
Pages (from-to)607-611
Number of pages5
JournalMineralogical Magazine
Volume57
Issue number4
Publication statusPublished - 1993
Externally publishedYes

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