Benmoreite

Benmoreite is a volcanic rock of intermediate composition. It is a silica-undersaturated sodium-rich variety of trachyandesite (the other kind is latite) and belongs to the alkaline suite of igneous rocks. It was named after Ben More, a mountain on the Isle of Mull, Scotland.

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]

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]

References

^ Sinton, J. (2006). "Maui Field Trip" (PDF). Department of Geology and Geophysics, University of Hawaii. p. 12. Retrieved 20 November 2018.
^ 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. Bibcode:2016BVol...78...48O. doi:10.1007/s00445-016-1041-4. S2CID 54939869.
^ 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.
^ 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.

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[MauiGeologyTrip2006-1] Sinton, J. (2006). "Maui Field Trip" (PDF). Department of Geology and Geophysics, University of Hawaii. p. 12. Retrieved 20 November 2018.

[Oddsson_et_al_2016-2] 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. Bibcode:2016BVol...78...48O. doi:10.1007/s00445-016-1041-4. S2CID 54939869.

[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.

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v t e Volcanoes
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v t e Types of rocks
Igneous rock	Adakite Andesite Alkali feldspar granite Anorthosite Aplite Basalt Alkali basalt Picrite basalt Basaltic trachyandesite Mugearite Shoshonite Basanite Blairmorite Boninite Carbonatite Charnockite Enderbite Dacite Diabase Diorite Napoleonite Dunite Essexite Foidolite Gabbro Granite Granodiorite Granophyre Harzburgite Hornblendite Hyaloclastite Icelandite Ignimbrite Ijolite Kimberlite Komatiite Lamproite Lamprophyre Latite Lherzolite Monzogranite Monzonite Nepheline syenite Nephelinite Norite Obsidian Pegmatite Peridotite Phonolite Phonotephrite Porphyry Pumice Pyroxenite Quartz diorite Quartz monzonite Quartzolite Rhyodacite Rhyolite Comendite Pantellerite Scoria Shonkinite Sovite Syenite Tachylyte Tephriphonolite Tephrite Tonalite Trachyandesite Benmoreite Trachybasalt Hawaiite Trachyte Troctolite Trondhjemite Tuff Websterite Wehrlite
Sedimentary rock	Argillite Arkose Banded iron formation Breccia Calcarenite Chalk Chert Claystone Coal Conglomerate Coquina Diamictite Diatomite Dolomite Evaporite Flint Geyserite Greywacke Gritstone Itacolumite Jaspillite Laterite Lignite Limestone Lumachelle Marl Mudstone Oil shale Oolite Phosphorite Sandstone Shale Siltstone Sylvinite Tillite Travertine Tufa Turbidite Varve Wackestone
Metamorphic rock	Anthracite Amphibolite Blueschist Cataclasite Eclogite Gneiss Granulite Greenschist Hornfels Calcflinta Itabirite Litchfieldite Marble Migmatite Mylonite Metapelite Metapsammite Phyllite Pseudotachylite Quartzite Schist Serpentinite Skarn Slate Suevite Talc carbonate Soapstone Tectonite Whiteschist
Specific varieties	Adamellite Appinite Aphanite Borolanite Blue Granite Epidosite Felsite Flint Ganister Gossan Hyaloclastite Ijolite Jadeitite Jasperoid Kenyte Lapis lazuli Larvikite Litchfieldite Llanite Luxullianite Mangerite Novaculite Pietersite Pyrolite Rapakivi granite Rhomb porphyry Rodingite Shonkinite Taconite Tachylite Teschenite Theralite Unakite Variolite Wad