Diamonds from placers in western and central Africa: A problem of primary sources

Posukhova, T. V.; Kolume, F. N.

doi:10.3103/s0145875209030053

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Thus, it is unlikely that the kimberlites discovered in the Siberian platform are the source of these diamond placers. In some other regions, e.g., Mbuji-Mayi (Congo), Ekati (Canada), and Jwaneng (Botswana), many cuboid diamonds are found in the kimberlites [8,20,21]. The characteristics of variety II diamonds, i.e., specific morphological features, the low values of δ 13 C and high levels of nitrogen in the C-form (single substitutional nitrogen impurity, type Ib-causing yellow coloration), testify to their unusual primary source [19,22].…”

Section: Introductionmentioning

confidence: 99%

The Internal Structure of Yellow Cuboid Diamonds from Alluvial Placers of the Northeastern Siberian Platform

et al. 2017

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Yellow cuboid diamonds are commonly found in diamondiferous alluvial placers of the Northeastern Siberian platform. The internal structure of these diamonds have been studied by optical microscopy, X-Ray topography (XRT) and electron backscatter diffraction (EBSD) techniques. Most of these crystals have typical resorption features and do not preserve primary growth morphology. The resorption leads to an evolution from an originally cubic shape to a rounded tetrahexahedroid. Specific fibrous or columnar internal structure of yellow cuboid diamonds has been revealed. Most of them are strongly deformed. Misorientations of the crystal lattice, found in the samples, may be caused by strains from their fibrous growth or/and post-growth plastic deformation.

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