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. Nepheline benmoreite magmas derived from mantle sources containing lherzolite xenoliths display similarities to some plutonic nepheline syenites.
- ^ http://gsabulletin.gsapubs.org/content/90/7/676.abstract 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
- ^ http://www.springerlink.com/content/m455x70110065087/ 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