quiz 6 Flashcards
The region of thermally metamorphosed rock surrounding a cooled pluton is called a(n)
aureole
what properly illustrates the principle of isostasy?
Mountains stand high because they are gravitationally balanced by their deep
crustal roots.
Why do earthquakes occur only above the brittle-ductile transition depth?
Below the transition, the rocks are too hot and deform plastically.
Normal faults are generally the result of…
stress.
tensional
An episode of mountain building is termed a(n)
orogeny
Which list properly orders metamorphic rocks from lowest grade to highest grade?
slate, phyllite, schist, and gneiss
Shields contain vast areas of exposed metamorphic rocks; this is due to the…. process.
exhumation
Preexisting rock that is subsequently altered to form a metamorphic rock is termed a
protholite
…. commonly serves as a protolith in the formation of slate.
shale
Right-lateral and left-lateral are both terms used in description of … faults
strike-slip
Metamorphism occurs at temperatures between … and ..
diagenesis; melting
Clay minerals within a buried body of slate are recrystallized at high temperatures and pressures to form mica, producing a rock called phyllite. This is an example of
metamorphism
is the process whereby rocks from depth are exposed at the surface during mountain building.
uplift
The outer portion of a craton, where deformed rocks are covered by sediments, is termed the
cratonic platform
The net chemical change in metamorphic rock induced by a reaction with hot groundwater is termed
metasomatism
Under which condition would a body of rock be most likely to exhibit brittle behavior?
low temperature
Normal, reverse, and thrust are all examples of
… faults.
dip-slip
Normal faulting is most often associated with mountain building along .. boundaries, while reverse faulting is generally observed at..
boundaries.
divergent ; convergent
A fold shaped like an elongated arch is a(n)
anticline
…. commonly serves as a protolith in the formation of marble.
limestone
which is the highest grade metamorphic rock
gneiss
The formation of the Basin and Range Province is associated with which of the following processes?
continental rifting
In the formation of gneiss from granite, distinctive compositional bands form because of
crystals dissolving, with atoms and ions migrating and reorganizing as new crystals
Two common metamorphic rocks that typically lack foliation are …
and….
quartzite; marble
The rapid, deep burial of sediments in an accretionary prism leads to the formation of a metamorphic rock termed
blueschist
Mountain ranges formed along subduction zones are formed, in part, by … in the crust.
compression and uplift
The blueschist facies is a metamorphie realm of
high pressure but relatively low temperature
The rock hornfel is often formed due to … metamorphism
thermal / contact
