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

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

Benmoreite has been found, for example, on Ascension Island and Easter Island, at Mount Berlin in Antarctica, and in Atakor volcanic field, Algeria. Benmoreite lava was erupted during the 2010 eruptions of Eyjafjallajökull.[2]

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.[3] Nepheline benmoreite magmas derived from mantle sources, containing lherzolite xenoliths, display similarities to some plutonic nepheline syenites.[4]

See also


  1. ^ Sinton, J. (2006). "Maui Field Trip" (PDF). Department of Geology and Geophysics, University of Hawaii. p. 12. Retrieved 20 November 2018.
  2. ^ Oddsson, B.; Gudmundsson, M.T.; Edwards, B.R.; Thordarson, T.; Magnússon, E.; Sigurðsson, G. (2016). "Subglacial lava propagation, ice melting and heat transfer during emplacement of an intermediate lava flow in the 2010 Eyjafjallajökull eruption". Bulletin of Volcanology. 78 (7). 48. doi:10.1007/s00445-016-1041-4.
  3. ^ 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.
  4. ^ 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. S2CID 129511256.