-
Sericitic alteration or
sericitization is a
process of
mineral alteration caused by
hydrothermal fluids invading permeable country rock.
Plagioclase feldspar...
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Quartzite is a hard, non-foliated
metamorphic rock
which was
originally pure
quartz sandstone.
Sandstone is
converted into
quartzite through heating and...
- in
areas that have been
subjected to
hydrothermal alteration (also see
Sericitic alteration)
typically ****ociated with copper, tin, or
other hydrothermal...
-
enargite and
tennantite may also occur.
Greisen alteration is similar.
Sericitic alteration Guilbert, John M. and C. F. Park, Jr., The
Geology of Ore Deposits...
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Mountain Quartzite, a m****ive
white quartzite interbedded with
softer sericitic quartzite, slate, and phyllite. The
formation is
divided into upper, middle...
-
Plagioclase will be
altered to
sericite (a fine-grained
white mica) by
sericitic alteration, and
mafic minerals are
replaced by quartz.
Tourmaline may...
-
magmatic processes, silicification, chloritization,
formation of illite,
sericitic alteration,
replacement of
plagioclase by albite, and
sulfidation ****ociated...
- this way they
become schistose, and from
their feldspar minute plates of
sericitic white mica are developed,
giving the rock in some
cases very much of the...
- kilometers,
broadening westward and is
composed of
banded quartzites, aplite,
sericitic schist,
pegmatite and ironstone. The
Nyanzian Belt, by contrast, is mainly...
-
composed of
formations from the Briançonnais zone; to the
north and east,
sericitic schists and
quartzites of the Tri****ic outcrop;
moving southward, there...
