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

Published online by Cambridge University Press:  05 July 2018

Ken Shibata ,
Hikari Kamioka ,
Felix V. Kaminsky ,
Vassili I. Koptil  and
Darcy P. Svisero
Ken Shibata
Affiliation:
Geological Survey of Japan, Tsukuba 305, Japan
Hikari Kamioka
Affiliation:
Geological Survey of Japan, Tsukuba 305, Japan
Felix V. Kaminsky
Affiliation:
Central Research Institute of Geological Prospecting for Base and Precious Metals, 113545, Moscow, Russia
Vassili I. Koptil
Affiliation:
Central Research Institute of Geological Prospecting for Base and Precious Metals, 113545, Moscow, Russia
Darcy P. Svisero
Affiliation:
Institute of Geosciences, University of Sao Paulo, C. P. 20899, Sao Paulo, Brazil
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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.

Keywords

carbonadoyakutitediamondflorenciterare earth elementcrust
Type
Geochemistry and Petrology
Information
Mineralogical Magazine , Volume 57 , Issue 389 , December 1993 , pp. 607 - 611
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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Footnotes

*

Present address: Department of Earth and Planetary Sciences, Nagoya University, Nagoya 464-01, Japan.

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