-
alongside phonolites. Low-degree
partial melting of
underplates of
granitic material in
collisional orogenic belts may also
produce phonolites.
Phonolite is...
-
other unusual igneous rocks such as carbonatite.
Nepheline syenites and
phonolites occur, for example, in Brazil, Canada, Cameroon, China, Greenland, Italy...
- of
basalts and
phonolites. They are
found in the east and west
areas of Chesowanja.
Besides diatoms and
silicified wood, the
phonolites consist of little...
-
Tephriphonolite or tephri-
phonolite is a
mafic to
intermediate extrusive igneous rock in
composition between phonotephrite and
phonolite. It
contains 9–14% alkali...
- The
phonolite or
clinkstone of
northern Ethiopia is a shallow-seated
igneous rock. The
phonolites intruded and
punctured the
Mesozoic sedimentary rocks...
- active. The
volcanoes are all
surmounted by
rocks composed of trachyte,
phonolite, pantellerite, or comendite.
Their activity has been
attributed either...
- romanized: Ye’Åksum ḥāwelt) is a 4th-century CE, 24-metre (79 ft) tall
phonolite stele,
weighing 160
tonnes (160 long tons; 180
short tons), in the city...
- deep
water along the
Cameroon Line. The
volcanic soils of
basalts and
phonolites,
dating to 3
million years, have been used for
plantation crops since...
-
Porphyritic tephriphonolite to
phonolite lavas of the
Caldera Rim group,
dated to 274,000–170,000
years ago
Phonolite lava
flows with
aegirine phenocrysts...
-
eruptive products of
Erebus are anorthoclase-porphyritic
tephritic phonolite and
phonolite,
which are the bulk of
exposed lava flow on the volcano. The oldest...
