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Abundant mantle xenoliths are found in widespread undersaturated Cenozoic basaltic rocks in Northeastern Tasmania and comprise lavas, dykes, plugs and diatremes. The basanites and nephelinites, include primitive magmas (11–14wt.% MgO) with OIB-like geochemical features. Trace element and Pb– and Sr–Nd isotope data suggest that they were generated by mixing of melts derived from low degree (<5%)...