- gl****y matrix.
Vitrophyres can be
alternatively described as
rocks having vitrophyric texture. This
texture results from the
rapid quenching of a lava where...
- the north-east side of
Plinth Peak. An unusual,
thick apron of
welded vitrophyric breccia may
represent the
explosive collapse of an
early lava dome, depositing...
- cane. The lava
historically erupted from
Izalco consists of
vesicular vitrophyric olivine basalts. Izalco's
formation was
preceded by
fumorolic activity...
-
vesicular and
minor proportions of amygdaloid, porphyric,
trachytic and
vitrophyric texture.
Hydrothermal alteration has been reported.
Cerro del Leon is...
- Mare
Basalt - 79515
Medium basalt Ilmenite Basalt - 79516 Fine
basalt Vitrophyric Ilmenite Basalt - 79517 Dark
matrix breccia Dark
Matrix Breccia - 79518...
- has
coloured them black, brown, red or yellow, and
their appearance is
vitrophyric or porphyritic.
Several dry
valleys originate on Llullaillaco, including...
- slopes,
which were
burned in place. An unusual,
thick apron of
welded vitrophyric breccia may
represent the
explosive collapse of a
former lava dome which...
- Formation, up to 150 m
thick of compound,
weakly to
strongly welded,
vitrophyric,
including pumice-,
andesite and
rhyolite lavas from the
Mangakino caldera...
-
carbon dioxide. The
rocks in the
volcanic field have
porphyritic to
vitrophyric textures. The
trachytes and
mugearites formed through magmatic differentiation...
- 10-20%
quartz and
alkali feldspar phenocrysts. Rare
occurrences of a
vitrophyric tuff at the base of the main bed
contain ferrohedenbergite and fayalite...
