Geochemistry and Petrogenesis of Amphibolites, Kolar Schist Belt, South India: Evidence for Komatiitic Magma Derived by Low Percentages of Melting of the Mantle

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Abstract
The Kolar Schist Belt of the Dharwar Craton of South India is an Archean greenstone belt dominated by metavolcanic rocks. The mafic metavolcanic rocks occur as komatiitic and tholeiitic amphibolites. The komatiitic amphibolites occur along the margins of the N–S trending, synformal belt. They are much less abundant than the tholeiitic amphibolites and have 14 to 21–3 wt. per cent MgO. The komatiitic amphibolites from the west/central part of the belt have two distinctive REE patterns: (1) those enriched in the middle to light REE but depleted in Ce relative to Nd; and (2) those with patterns that are convex up, i.e. depleted in both light and heavy REE, although more depleted in the light REE. Associated tholeiites have light REE depleted to flat REE patterns. Komatiitic and tholeiitic amphibolites from the eastern part of the belt have enriched light REE patterns.

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