chapter 7 Flashcards
__ are important economic resources for lead, zinc, gold, silver, tungsten, tin and mercury.
meteor impact sites, hydrothermal veins or marble?
hydrothermal veins
___ forces the constituents of a rock to become parallel to one another.
pressure, strain, differential stress or starch?
differential stress
__ forms when a limestone recrystallizes during metamorphism.
marble, gneiss, or coal
marble
because of the ease with which it can be split into thin flat sheets, this metamorphic rock is used for making chalkboard, pool tables, and roofs.
granite, marble, slate or quartzite?
slate
when a rock is buried to increasing depth it is subject to increasingly greater temp and pressure and will undergo ___.
contact metamorphism, shock metamorphism, or prograde metamorphism?
prograde metamorphism
the most important factors controlling the characters of metamorphic rocks include __.
temperature, pressure, water, composition of parent rock, or all or the above?
all of the above
___stress is a type of differential stress.
shearing, confining, or hydrostatic
shearing
shock metamorphism can occur as a result of __.
tsunami, earthquakes, meteor impacts or tornadoes
meteor impacts
__ is metamorphism coupled with the introduction of ions (charged atoms) from an external source.
blending, metasomatism or differentiation?
metasomatism
__ is the lowest-grade rock in progressive metamorphism.
schist, gneiss, marble or slate?
slate
__ is a very fine-grained metamorphic rock that splits along parallel planes.
slate, sandstone, or marble?
slate
the major __ classification of metamorphic rocks divides them into foliated and non-foliated groups.
crystal size, textural, mineral or genetic.
textural
the light-color layers within a typical gneiss are formed by __.
amphiboles, feldspars, olivine, or calcite?
feldspars
the deeper a rock is below the earth’s surface __.
the hotter it will be, the cooler it will be, or has no influence on temperature?
the hotter it will be
metamorphic rocks are prevalent __.
in intensely deformed portions of large mountain ranges, where the continental crust is subjected to high temperatures, pressures, and tectonic stress.
__ metamorphism takes place at considerable depth underground (generally > than 5km).
contact, regional, or burial
regional
__ is produced when grains of quartz in sandstone are welded together when the rock is subjected to high temperatures.
limestone, marble,quartzite or monzonite.
quartzite
the differential stress responsible for foliation can take place at __.
the gutenberg discontinuity, hydrothermal locations, or convergent boundaries.
convergent boundaries
a __ is characterized by parallel - oriented minerals, commonly mica.
schist, gneiss, or amphibolite
schist
the zone of contact metamorphism (the aureole), __.
is commonly broad, commonly narrow, is a thin zone, or a very thin zone.
commonly narrow, from 1-100 meters wide
__ metamorphism occurs adjacent to a pluton when a body of magma intrudes a relatively cool country rock.
sedimentary, contact, igneous, regional or burial.
contact
__ is pressure applied equally to all surfaces of a substance as a result of burial or submergence.
differential stress, confining pressure, strain, temperature or magnetism.
confining pressure
When clay minerals in a shale are subjected to elevated temperature and pressure, they may change in the solid state (that is, without melting) to form platy minerals like ___ that are at equilibrium with the new temperature/pressure conditions.
feldspar, mica or pyroxene?
mica
___ is a metamorphic rock with distinct light and dark layers that formed at high temperatures and pressures.
slate, schist, gneiss or greenstone
gneiss
the most important factor in controlling the final metamorphic product is __.
composition of pre-existing rock, temp, pressure/stress,or shock
composition of pre-existing rock
metamorphism may involve all of the following except__.
formation of new minerals, recrystallization, or complete melting of the rock.
complete melting of the rock
__ tends to deform objects into oblong or flattened forms.
strain, differential stress, temp or pressure
differential stress
__ metamorphism is the term used for the process in which rocks are altered by hot water.
aqueous, tectonic, hydrothermal, shock, or burial.
hydrothermal
the 2 most common non-foliated metamorphic rocks are __ and marble
slate, gneiss, quartzite, or phyllite
quartzite
