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Benmoreite is a silica undersaturated volcanic rock of intermediate composition. It is a variant of trachyandesite and belongs to the alkalic suite of igneous rocks. An origin by fractionation from basanite through nepheline hawaiite to nepheline benmoreite has been demonstrated for a volcanic suite in the McMurdo Volcanic Group of late Cenozoic age in McMurdo Sound area.[1] Nepheline benmoreite magmas derived from mantle sources containing lherzolite xenoliths display similarities to some plutonic nepheline syenites.[2]


  1. ^ Kyle, Philip R., Geology and petrology of the McMurdo Volcanic Group at Rainbow Ridge, Brown Peninsula, Antarctica, Geological Society of America Bulletin, July 1979, v. 90 no. 7 p. 676-688
  2. ^ Green, D. H., et al., Upper mantle source for some hawaiites, mugearites and benmoreites, Contributions to Mineralogy and Petrology, Volume 48, Number 1 / March, 1974