Lesson 4.4 Flashcards
are rocks
that have been altered, changed,
or transformed in the solid state
due to changes in pressure,
temperature conditions, and
chemical actions of hot fluids
Metamorphic rocks
refers to the alteration of rocks due to
different factors, like temperature and pressure. There are
many ways by which this occurs.
Metamorphism
Formation of Metamorphic Rocks
changes in mineral during metamorphism can happen in 3 possible ways
Recrystallization
Neomorphism
Metasomatism
occurs when
small crystals of one mineral
will slowly convert to fewer,
larger crystals of the same
mineral without melting the
rock
Recrystallization
is the process whereby minerals not only
recrystallize, but also form different minerals from the
same chemical elements
Neomorphism
is the addition or loss of elements new
minerals form with only some of the original elements,
and new elements were added through hydrothermal
migration
Metasomatism
Types of Metamorphic Rocks
Foliated metamorphic rocks
Nonfoliated metamorphic rocks
occurs only at a local area
adjacent to large
intrusions and along
fractures that are in
contact with hot fluids
is most
effective at narrow zones specifically at the
contact between the host rock and
intrusive magma or hot fluids
Contact metamorphism
occurs when there are
major igneous intrusions,
presence of extreme
pressure and heat due to
deep burial
● Metamorphism may occur when
there are major igneous intrusions
that form and cool over long periods
of time.
● Another condition that may result to
metamorphism is the presence of
extreme pressure and heat due to
deep burial or tectonic movements
of rock.
● Lastly, regional metamorphism may
happen when there is a widespread
migration of hot gases or
condensation throughout a region.
Regional metamorphism
are formed when
parallel planes of platy or
elongated minerals
creating what is called as
foliations
ex. schist, gneiss, phyllite
Foliated metamorphic
rocks
do not have layered
appearance
ex. marble, quartzite, anthracite
Nonfoliated
metamorphic rocks
shows that all rocks are related to each other
rock cycle
rock cycle
igneous->sedimenrary or metamorphic
sedimentary->igneous or metamorphic
metamorphic->all rock types
illustrates the relative stability
or weathering rate of
numerous minerals. This
series is roughly the inverse
order of original crystallization
for minerals found in the
Bowen’s reaction series.
Goldich stability series
The scale indicating the level of pressure and temperature during the formation of
a particular metamorphic rock is called _ _ . The higher the
temperature and pressure, the higher it is.
metamorphic grade
