-
magmas cool
beneath the
surface before they erupt. As they do this,
bubbles exsolve from the magma.
Because the
magma is viscous, the
bubbles remain trapped...
-
other compounds that
reverse negative buoyancy, or with the
addition of
exsolved gas
bubbles in the
cryomagma that were
previously dissolved into it (that...
-
ascent and eruption,
pressure drops rapidly, and
these g****es
begin to
exsolve out of the melt. A
volcanic eruption is
effusive when the
erupting magma...
- pot****ium-rich
alkali feldspar (near K-feldspar, KAlSi3O8, in composition)
includes exsolved lamellae or
irregular intergrowths of
sodic alkali feldspar (near albite...
-
temperature histories of rocks. With
declining temperature,
augite may
exsolve lamellae of
pigeonite and/or orthopyroxene.
There is also a miscibility...
- CaAl)AlSi2O8
anorthite (90 to 100) CaAl2Si2O8
Intermediate compositions of
exsolve to two
feldspars of
contrasting composition during cooling, but diffusion...
- As
rising magma encounters lower pressures,
dissolved gases are able to
exsolve and form vesicles. Some of the
vesicles are
trapped when the
magma chills...
- concentration, the
volatiles will tend to come out of
solution within the
magma (
exsolve) and form a
separate gas
phase (the
magma is super-saturated in volatiles)...
-
forms when Na-rich
feldspar exsolve in a K-rich host. The
opposite texture (antiperthitic),
where K-rich
feldspar exsolves in a Na-rich host, is very rare...
- and CO2) that are
dissolved in the lava,
causing the
gases to
rapidly exsolve (like the
bubbles of CO2 that
appear when a
carbonated drink is opened)...
