- In geology,
felsic is a
modifier describing igneous rocks that are
relatively rich in
elements that form
feldspar and quartz. It is
contrasted with mafic...
- into four
chemical types based on
silica content:
felsic, intermediate, mafic, and ultramafic.
Felsic or
silicic lavas have a
silica content greater than...
-
syenites contain larger proportions of
mafic components and
smaller amounts of
felsic material than most granites;
those are
classed as
being of intermediate...
- The
Acasta Gneiss Complex, also
called the
Acasta Gneiss, is a body of
felsic to
ultramafic Archean ba****t rocks, gneisses, that form the northwestern...
- of the
ratio between generally dark
mafic minerals and
generally light felsic minerals in an
igneous rock. The
color index of an
igneous rock is the volume...
-
material had formed. The
series is
divided into two branches, the
continuous (
felsic minerals: feldspars) and the
discontinuous (mafic minerals). The minerals...
-
Archean felsic volcanic rocks are
felsic volcanic rocks that were
formed in the
Archean Eon (4 to 2.5
billion years ago). The term "
felsic"
means that...
-
spreading far, due to high viscosity. The
magma forming this lava is
often felsic,
having high to
intermediate levels of
silica (as in rhyolite, dacite, or...
-
especially of the
felsic type such as
felsites and rhyolites, may have a
cryptocrystalline groundm**** as
distinguished from pure
obsidian (
felsic) or tachylyte...
-
contains a high
percentage (>63%) of silica, the lava is
described as
felsic.
Felsic lavas (dacites or rhyolites) are
highly viscous and are
erupted as domes...
