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Magnetite-serpentine-calcite dykes at Premier Mine and aspects of their relationship to kimberlite and to carbonatite of alkalic carbonatite complexes

Magnetite-serpentine-calcite dykes at Premier Mine and aspects of their relationship to kimberlite and to carbonatite of alkalic carbonatite complexes

Physics and Chemistry of the Earth 9(none): 0-70

Magnetite-serpentine-calcite rocks at Premier Mine are shown to be igneous dykes which, in some cases, have caused extensive carbonatization of country rock kimberlite. Previous theories of a metasomatic origin for the dykes have probably resulted from studies of carbonatized kimberlite and not of the dykes themselves. The magnetite-serpentine-calcite rock is considered to represent a residual, vapour-rich liquid which separated from crystallizing kimberlite and was subsequently intruded as a separate phase. Though qualifying as carbonatite, the dyke rocks differ radically from typical carbonatite of alkalic carbonatite complexes in that serpentine is an interstitial phase, and in the manner in which they have metasomatized their wall rocks. Thus, no direct relationship toward carbonatite of alkalic carbonatite complexes can be proved.

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Accession: 019359361

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DOI: 10.1016/0079-1946(75)90007-5

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