Plastic deformation in natural diamonds: Rose channels associated to mechanical twinningReport as inadecuate

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1 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie 2 Musée de Minéralogie 3 LSI - Laboratoire Simulation Interactive LIST - Laboratoire d-Intégration des Systèmes et des Technologies : DRT-LIST 4 LPGN - Laboratoire de Planétologie et Géodynamique de Nantes 5 IMN - Institut des matériaux Jean Rouxel

Abstract : Hollow channels in diamond are well acknowledged to be the result of dissolution processes. In this article we demonstrate that some hollow channels in natural diamonds are the consequence of intense plastic deformation by mechanical twinning. Two mixed-habit diamonds presenting numerous geometrical hollow tubes were studied. X-ray Laue analyses showed the presence of microtwins. At the intersection of microtwins, displacements and cracks are generated, creating the hollow channels observed. The presence of the cracks seems to have released the internal stress, as there was less to no signs of deformation at and around them. Further dissolutions are sometimes but not always seen within the cavities. Mechanical twinning, so far mostly identified in pink to purple diamonds, might be more widespread than originally thought in natural diamonds.

Keywords : High pressure high temperature cracks Natural diamond Rose channels Mechanical micro-twin Plastic deformation

Author: Marie Schoor - Jean-Claude Boulliard - Eloise Gaillou - Olivier Hardouin Duparc - Imène Estève - B Baptiste - B Rondeau - E Fri



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