Benmoreite

Benmoreite is a silica-undersaturated volcanic rock of intermediate composition. It is a sodium-rich variety of trachyandesite and belongs to the alkalic suite of igneous rocks.

Benmoreite lava forms the "Dragon's Teeth" landmark on Maui, Hawaii[1]

Nepheline benmoreite

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 of Antarctica.[2] Nepheline benmoreite magmas derived from mantle sources, containing lherzolite xenoliths, display similarities to some plutonic nepheline syenites.[3]

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References
  1. Sinton, J. (2006). "Maui Field Trip" (PDF). Department of Geology and Geophysics, University of Hawaii. p. 12. Retrieved 20 November 2018.
  2. Kyle, P. R.; Adams, J.; Rankin, P. C. (1979). "Geology and petrology of the McMurdo Volcanic Group at Rainbow Ridge, Brown Peninsula, Antarctica". Geological Society of America Bulletin. 90 (7): 676–688. Bibcode:1979GSAB...90..676K. doi:10.1130/0016-7606(1979)90<676:GAPOTM>2.0.CO;2.
  3. Green, D. H.; Edgar, A. D.; Beasley, P.; Kiss, E.; Ware, N. G. (1974). "Upper mantle source for some hawaiites, mugearites and benmoreites". Contributions to Mineralogy and Petrology. 48 (1): 33–43. Bibcode:1974CoMP...48...33G. doi:10.1007/BF00399108.
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