- A
mafic mineral or rock is a
silicate mineral or
igneous rock rich in
magnesium and iron. Most
mafic minerals are dark in color, and
common rock-forming...
- high FeO, low pot****ium, and are
usually composed of
greater than 90%
mafic minerals (dark colored, high
magnesium and iron content). The Earth's mantle...
-
feldspar (90–100%), with a
minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and
olivine are the
mafic minerals most
commonly present. Anorthosites...
- ultramafic-
mafic intrusive complex consists of
ultramafic peridotites and
pyroxenites with ****ociated
chromitite layers toward the base with more
mafic norites...
- of
alkali metals. It is
intermediate in
composition between low-silica (
mafic)
gabbro and high-silica (felsic) granite.
Diorite is
found in mountain-building...
- from the
rapid cooling of low-viscosity lava rich in
magnesium and iron (
mafic lava)
exposed at or very near the
surface of a
rocky planet or moon. More...
-
consists largely of
tonalitic and
granodioritic gneisses and
lesser amounts of
mafic and
ultramafic gneisses. It
underlies and is
largely concealed by thin,...
- volcanics. The
hangingwall to the
deposit is
broadly related to a more
mafic sequence of
volcanic rocks,
either andesite (examples
being Whim Cr**** &...
-
Bimodal volcanism is the
eruption of both
mafic and
felsic lavas from a
single volcanic centre with
little or no
lavas of
intermediate composition. This...
-
melting of
crust rock from the heat of
underlying mafic magmas. The
lighter felsic magma floats on the
mafic magma without significant mixing. Less commonly...
