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Open AccessFeature PaperArticle

Deformation Features of Super-Deep Diamonds

1
V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch Russian Academy of Sciences, Novosibirsk 630090, Russia
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Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk 630090, Russia
3
Budker Institute of Nuclear Physics, Siberian Branch Russian Academy of Sciences, Novosibirsk 630090, Russia
4
Geochemical Research Center, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan
*
Authors to whom correspondence should be addressed.
Minerals 2020, 10(1), 18; https://doi.org/10.3390/min10010018
Received: 22 November 2019 / Revised: 18 December 2019 / Accepted: 21 December 2019 / Published: 24 December 2019
The paper presents new data on the internal structure of super-deep (sublithospheric) diamonds from Saõ-Luiz river placers (Brazil) and from alluvial placers of the northeastern Siberian platform (Yakutia). The sublithospheric origin of these diamonds is supported by the presence of mineral inclusions corresponding to associations of the transition zone and lower mantle. The features of morphology and internal structure have been studied by optical and scanning electron microscopy (SEM), cathodoluminescence topography (CL), and electron backscatter diffraction (EBSD) techniques. Diamonds typically have complicated growth histories displaying alternating episodes of growth, dissolution, and post-growth deformation and crushing processes. Most crystals have endured both plastic and brittle deformation during the growth history. Abundant deformation and resorption/growth features suggest a highly dynamic growth environment for super-deep diamonds. High temperatures expected in the transition zone and lower mantle could explain the plastic deformations of super-deep diamonds with low nitrogen content. View Full-Text
Keywords: diamond; internal structure; electron backscatter diffraction; deformation diamond; internal structure; electron backscatter diffraction; deformation
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MDPI and ACS Style

Ragozin, A.; Zedgenizov, D.; Shatsky, V.; Kuper, K.; Kagi, H. Deformation Features of Super-Deep Diamonds. Minerals 2020, 10, 18.

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