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Spectroscopic 2D-tomography

¹ Institut für Geowissenschaften - Mineralogie, Johannes Gutenberg-Universität, D-55099 Mainz, Germany
² Institut für Mineralogie und Geochemie, Universität zu Köln, D-50674 Köln, Germany
³ Institut für Mineralogie, Johann Wolfgang Goethe-Universität, D-60054 Frankfurt/Main, Germany
⁴ Department of Geosciences, State University of New York at Stony Brook, Stony Brook, NY 11794, U.S.A.
⁵ Division of Earth Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom
⁶ Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
⁷ Jobin Yvon GmbH, Neuhofstr. 9, D-64625 Bensheim, Germany

^* Corresponding author: nasdala{at}uni-mainz.de

We have studied high-pressure inclusions (Ca-silicates, coesite, graphite) in three large diamonds, one from the Kankan district, Guinea, and the other two from the Panda kimberlite, Ekati diamond mines, Canada. Using the in situ point-by-point mapping technique with a confocal Raman system, the mineralogy of the inclusions, as well as their area distribution pattern (e.g., of different Ca-silicate phases) and their order-disorder distribution pattern (shown for graphite/disordered carbon), were determined. Raman mapping of the host diamonds yielded 2D-tomographic pressure and strain distribution patterns and provided information on the residual pressure of the inclusions ( 2.3 GPa for a coesite inclusion and 2.6 GPa for a graphite inclusion). The inclusions are surrounded by haloes of significantly enhanced pressure, several hundred m across. These haloes exhibit complex pressure relaxation patterns that consist of micro-areas affected by both compressive and dilative strain, with the latter being intensive enough to result in apparent "negative pressures".

Key-words: diamond, graphite, coesite, larnite, walstromite, Raman spectroscopy, high pressure inclusions.

This article has been cited by other articles:

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