Transcript Week SEVEN: Metamorphic Rocks

Week SEVEN:
Metamorphic Rocks
Metamorphic rocks have been recrystallized due to intense heat
and/or pressure. Heat and pressure can cause recrystallization
through partial melting, diffusion, and deformation.
1. Where do
metamorphic
rocks occur in
your region
and why?
 Slates and quartzite are exposed in lower Big Cottonwood canyon.
Seven miles from the mouth of the canyon there is also marble.
There is also gneiss up on the north end of Farmington. Since most
metamorphic rocks are produced at the roots of a folded
mountain belt, it makes sense that different types of metamorphic
rocks are found near the Wasatch Mountains, especially places
that have been eroded down, such as canyons.
gneiss boulder from of
the ~1.8 billion-year-old
Farmington Canyon
Complex, which
comprises the basal
outcrop of the Wasatch
Range and a bulk of the
basement rock for
.
northern Utah
2. Describe
two examples
of how
metamorphic
rocks are used
in your area.
 Marble is used all over the place for construction: tile, countertops,
statues, window casings.
Describe two
examples of
how
metamorphic
rocks are used
in your area.
Slate is used to make blackboards and patios. Blackboards are not
really used in schools anymore and replaced by white boards and
interactive boards.
Marble Crypt
in Salt Lake
City Cemetery
is the most
photographed
marble stone
in Utah.
1.Marble is a metamorphic
rock formed when limestone is
exposed to high temperatures and
pressures. Marble forms under
such conditions because the
calcite forming the limestone
recrystallizes forming a denser
rock consisting of roughly calcite
crystals.
Location: Salt Lake City Cemetery (I don’t like to take pictures
inside the cemetery).
LDS Tabernacle
Hall –Location:
Downtown Salt
Lake City
Rock:
Metamorphic:
Quartzite –
Gartra Grit
Member of
Ankarch
Formation
Utah State
CapitolInterior,
Murphy
Marble
(Location-Salt
Lake City; I did
not take this
picture)