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Sorokhtin N.O., Kozlov N.E., Martynov E.V., Kozlova N.E.

The Late Archaean comatiites: Certain aspects of ore content

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Abstract. Boninites are characterised by a great range of variety and they cannot be practically compared with igneous rocks like picrites, picrite-basalts, basalts, andesites, dacite, and rhyolites. This feature is conditioned by the presence of non-equilibrium phases: quarts-normative matrix and olivine impregnation. Abundance ratio and composition of non-equilibrium phases may be different, and that causes the variety of boninites. The boninite magmas were probably generated by the process of fractional crystallisation of high-magnesium picrite and picrite-basalt melts in subvolcanic conditions. It is necessary for the formation of boninites magmas that the eruption of magma was occurred at a definite stage of crystallisation before olivine separation.

Keywords: greenstone belts, komatiites, geochemistry, distinction trends, Early Precambrian mantle, metallogeny

Printed reference: The Late Archaean comatiites: Certain aspects of ore content / N.O. Sorokhtin, N.E. Kozlov, E.V. Martynov, N.E. Kozlova // Vestnik of MSTU. 2009. V. 12, No 3. P. -.

Electronic reference: The Late Archaean comatiites: Certain aspects of ore content / N.O. Sorokhtin, N.E. Kozlov, E.V. Martynov, N.E. Kozlova // Vestnik of MSTU. 2009. V. 12, No 3. P. -. URL: http://vestnik.mstu.edu.ru/v12_3_n36/articles/09_sorok.pdf.

(In Russian, p.9, fig. 6, tables 3, ref 20, Adobe PDF)