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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...
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Peridotite xenoliths in
phonotephrite, from Arizona...
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mafic to
intermediate extrusive igneous rock in
composition between phonotephrite and phonolite. It
contains 9–14%
alkali content and 48–57%
silica content...
- 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...
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exposes intrusions of syenite. Kibo has five main lava formations:
Phonotephrites and
tephriphonolites of the Lava
Tower group, on a ****
cropping out...
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laterally discontinuous volcaniclastics,
basaltic trachyandesite,
phonotephrite, and
trachyte Argentina Spring Tuff (36 Ma)
Taylor Windmill Member:...
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syenite Nephelinite Norite Obsidian Pegmatite Peridotite Phonolite Phonotephrite Porphyry Pumice Pyroxenite Quartz diorite Quartz monzonite Quartzolite...
- (Picrobasalt) U1 (Basanite or Tephrite)—Use
normative mineralogy to decide. U2 (
Phonotephrite) U3 (Tephriphonolite) F (Foidite)—When possible, classify/name according...
