Samples of Cenozoic (40 Ma) alkaline trachybasalts from East Antarctic Manning Massif were analysed for trace elements composition using ICP-MS technique. Strong enrichment in incompatible element coupled with high to medium concentrations of relatively non-refractory major oxide and the composition of olivine phenocrysts, suggests that the magma was derived from the source enriched in LILE, HFSE and LREE. The composition of the trachybasalts can be considered as a mixture of a wall-rock peridotite component supplying refractory mantle elements, and an additional component to supply most of alkalis, LILE and LREE to the melt. Fractionation of clinopyroxene and olivine was essential to allow the primary melt to obtain trace element characteristics of the MMAV.
|Number of pages||4|
|Publication status||Published - 1997|