• The Journal of the Petrological Society of Korea
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• v.12 no.2
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• pp.55-69
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• 2003

A spinifex textured komatiite sample of Early Tertiary age, from the Gorgona Islands of Colombia in South America, was petrographically and geochemically studied, and compared with the previous researches of the komatiites including other Precambrian komatiites in South Africa, Western Australia and Canada. The sample shows the komatiitic characteristics in its petrography and geochemistry very well, i.e. in high specific gravity (2.98) and density (3.2), rock forming minerals, spinifex texture, major and race element abundances and REE pattern. In particular the REE pattern for it strongly suggests that the Gorgona komatiite must have been crystallized from a magma generated from a depleted mantle as that of Munro Township area in Ontario, Canada which is pyroxenite komatiite or basaltic komatiite of Group I of the Archean.