Geochemical analysis reveals depleted mantle origins and host rock contamination in Mesoproterozoic intrusions, indicating proto-oceanic bimodal magmatism.
sequence intruded by 1.10-1.02 Ga metadiabases, gabbros, meta-gabbros, and amphibolites associated with granitic plutons (bimodal magmatism). The original tholeiitic magmas, derived from a depleted source (! Nd(T) = +3.1 to +5.0), in a proto-oceanic setting, underwent subsequent contamination by the host rocks, as indicated by the isotopic and trace element data.
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Girardi et al. (2008) studied this question.
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