Peridotite xenoliths (green) in phonotephrite from Peridot Mesa, Arizona
Phonotephrite or phono-tephrite is a strongly alkaline volcanic rock with a composition between phonolite and tephrite.[1] This unusual igneous rock contains 7 to 12% alkali content and 45 to 53% silica content (see TAS diagram). It can be described as a mafic phonolite or a potassic tephrite. Phonotephrite lava flows and volcanic cones have been identified in Antarctica (e.g. Mount Erebus), Europe (e.g. Mount Vesuvius), North America (e.g. Satah Mountain volcanic field) and Africa (e.g. Jbel Saghro).[2][3][4][5]
^"Unusual Lava Types". Strongly Alkaline Lavas. San Diego State University. Archived from the original on 2020-11-05. Retrieved 2016-09-11.
^P. Esser, Richard; R. Kyle, Philip; McIntosh, William C. (2004). "40Ar/39Ar dating of the eruptive history of Mount Erebus, Antarctica: volcano evolution". Bulletin of Volcanology. 66 (8). Springer: 671. Bibcode:2004BVol...66..671E. doi:10.1007/s00445-004-0354-x. S2CID 129118037.
^Kuehn, Christian; Guest, Bernard; K. Russell, James; A. Benowitz, Jeff (2015). "The Satah Mountain and Baldface Mountain volcanic fields: Pleistocene hot spot volcanism in the Anahim Volcanic Belt, west-central British Columbia, Canada". Bulletin of Volcanology. Springer: 8.
^Berger, J.; Ennih, N.; Mercier, J.-C. C.; Liégeois, J.-P.; Demaiffe, D. (2009). "The role of fractional crystallization and late-stage peralkaline melt segregation in the mineralogical evolution of Cenozoic nephelinites/phonolites from Saghro (SE Morocco)". Mineralogical Magazine. 73 (1). Mineralogical Society of Great Britain and Ireland: 59. Bibcode:2009MinM...73...59B. doi:10.1180/minmag.2009.073.1.59. ISSN 1471-8022. S2CID 54866658.
^Pichavant, M.; Scaillet, B.; Pommier, A.; Iacono-Marziano, G.; Cioni, R. (2014). "Nature and Evolution of Primitive Vesuvius Magmas: an Experimental Study". Journal of Petrology. 55 (11). Oxford University Press: 2281–2310. doi:10.1093/petrology/egu057.
Phonotephrite or phono-tephrite is a strongly alkaline volcanic rock with a composition between phonolite and tephrite. This unusual igneous rock contains...
silica-undersaturated volcanic rock; essentially similar to nepheline syenite Phonotephrite – strongly alkaline volcanic rock with a composition between phonolite...
mafic to intermediate extrusive igneous rock in composition between phonotephrite and phonolite. It contains 9 to 14% alkali content and 48 to 57% silica...
low broad platform shield of Erebus. Slightly younger basanite and phonotephrite lavas crop out on Fang Ridge – an eroded remnant of an early Erebus...
open for travelers now. Pico do Fogo consists of basanite, tephrite, phonotephrite, clinopyroxene, amphibole, magnetite, olivine, melilite and leucite...
exposes intrusions of syenite. Kibo has five main lava formations: Phonotephrites and tephriphonolites of the Lava Tower group, on a dyke cropping out...
(Picrobasalt) U1 (Basanite or Tephrite)—Use normative mineralogy to decide. U2 (Phonotephrite) U3 (Tephriphonolite) F (Foidite)—When possible, classify/name according...
the northwest of Kattothyrst, has basanite lavas with an intervening phonotephrite flow on the northeast side. The Obelisk has a south end of trachybasalt...
almost entirely made of these rock types. Other igneous rocks such as phonotephrite are present in smaller quantities; these occur in the Satah Mountain...
Brava feature felsic rocks. The dominant volcanic rock is phonolite and phonotephrite although clinopyroxene nephelinite has also been recorded. Volcanic...
Mefford Knoll, benmoreite from the southeastern flank at Wedemeyer Rocks, phonotephrite from Brandenberger Bluff, and mugearite without any particular locality...
rocks dredged from Vesteris include basanite as the major component, phonotephrite and tephrite but also alkali basalt, mugearite and trachybasalt. Samples...
Global Information