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Diffusion in diamond. I. Carbon isotope mapping of natural diamond

Published online by Cambridge University Press:  05 July 2018

J. A. Craven ,
B. Harte ,
D. Fisher  and
D. J. Schulze
J. A. Craven
Affiliation:
Grant Institute of Earth Science, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JW, UK
B. Harte*
Affiliation:
Grant Institute of Earth Science, University of Edinburgh, King’s Buildings, Edinburgh EH9 3JW, UK
D. Fisher
Affiliation:
DTC Research Centre, Belmont Road, Maidenhead SL6 6JW., UK
D. J. Schulze
Affiliation:
Department of Geology, University of Toronto, Mississauga, Ontario, Canada L5L 1C6
*
* E-mail: [email protected]
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Abstract

Recent advances in ion microprobe instrumentation and techniques have enabled the mapping of C isotope ratios across the whole of a polished plate of a natural diamond from Guaniamo, Venezuela. The resultant map of C isotope variation closely matches the cathodoluminescence image of the growth structure of the diamond and, therefore, indicates an extremely limited scale of diffusion of C atoms sincethetimeof diamond formation. This result is compatible with thelimite d mobility of N atoms shown by theIaAB aggregation stateof thediamond. Inclusions in thediamond aree clogitic, in common with many Guaniamo diamonds with temperatures of formation of around 1200ºC. At such temperature the IaAB aggregation state indicates a mantle residence time on the order of 1 Ga. Such temperatures of formation and mantle residence times are common to many natural diamonds; thus the extremely limited diffusion of C isotopes shown by the mapping indicates that many diamonds will retain the C isotope compositions of their initial formation.

Keywords

diffusiondiamondion microprobeC isotope mapping.
Type
Research Article
Information
Mineralogical Magazine , Volume 73 , Issue 2 , April 2009 , pp. 193 - 200
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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