the study of rocks. Along with mineralogy, structural geology,
geochemistry, geophysics and others, it is part of geology. So, a
metamorphic one is the study of metamorphic
rocks are derived from pre-existing rocks by structural, chemical and
mineralogical changes due to changes in pressure, temperature, chemical
environment and shearing stress at depths below the zones of
cementation and weathering.
There is no melting - it is a process in solid
relationship is concluded in the metamorphic
facies concept, which
states that rocks with the same chemical composition should produce the
same metamorphic assemblage at the same temperatures and pressures.
Deformation also plays a significant role.
During the metamorphic
a metavolcanic or metasedimentary rock is finally brought back to the
surface. On its way back up it experiences retrograde metamorphism and
include hornfelsic, crystalline, granulated and brecciated.
minerals are quartz,
epidote, staurolite, sillimanite,
kyanite, amphibole, graphite, andalusite and garnet.
Some other characteristics include
related to regional structures
progressive change in mineralogy over a large area
grains over a large area
crystals, pebbles or fossils
close to igneous rocks, sometimes as an aureole
located in orogenic or precambrian terrain