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- Lava is molten rock
expelled by a volcano during an eruption.
- A lava flow is a
(moving) outpouring of lava, which is created during a non-explosive
effusive eruption. When it has stopped moving, lava solidifies to form
- The composition of a
lava determines its behavior more than the temperature of its eruption.
- The viscosity of lava is important because it determines how the lava will
- Island-arc magmas are
generated in metosomatically altered mantle. This is comfirmed by
findings in lavas of ultramafic inclusions with chromian magnesian
- Hawaiian lavas show a
much wider spread that partially overlaps the partial melts of garnet
pyroxenite, and extends toward the melts generated from carbonated
lherzolite at 3.0GPa
- The origin of
granites and the possibility of generating them by direct fractional
crystallization of mantle derived magma have been the subject of
numerous debates for a long time.
- Zeolites and
associated minerals occur in a tholeiitic basaltic pillow lava sequence
that makes up part of the Eocene Siletz River Volcanics.
- Xenoliths of igneous
material, generally ultrabasic, are abundant in some lava flows.
- The chemical
composition of analcite extracted from mafic phonolite lavas of the
Highwood Province of Montana.
- Chloritoid occurs as
a hydrothermal alteration mineral in pre-Cambrian lavas.
- Minor prehnite,
albite and quartz appear in some lavas.
- Extrusive igneous
rock forms above-ground. Extrusive igneous rock can form from lava and
pyroclastic debris, particles from lava that exploded into the
- The simplest process,
and the one that an igneous petrologist would always check out first, is
- Predominant rock types are basic lava flows characterized by high K
content which classify as high-K calcalkaline basalts and basaltic
andesites with shoshonitic affinity.
- Viscous lava is
silica-rich and tends to form a mound-like dome on top of the volcano.
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