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Benmoreite : ウィキペディア英語版
Benmoreite
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.〔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〕 Nepheline benmoreite magmas derived from mantle sources containing lherzolite xenoliths display similarities to some plutonic nepheline syenites.〔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〕
==References==



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