Flashcards
Geology 2nd Midterm
Cards in this deck (18)
- 1How are metamorphic rocks formed?transformation of pre-existing rocks
- 2What are the factors needed for metamorphic rocks to form?high temperature,
high pressure,
oriented stress,
pre-existing rocks
solid state- no metling
different rock types
natural processes
transformation - 3What is metasomatism?transformation of pre-existing rocks
by removing or adding chemicals, due temperature, pressure or chemically reactive fluids (hydrothermic and other fluids) - 4igneous rocks form from?melted rocks, when it cools geologic clock starts
- 5What are the factors of metamorphism?Temperature
pressure
oriented stress
chemically reactive fluid - 6What are temperature sources?Earth core heat
radioactive decay
migrating molten magma - 7What is the rate of change of temperature with depth?Geothermal gradient
- 8What are the effects of temperature?bond breakage in crystal structures
formation of new crystals/ minerals
textural realignments - 9What are the two types of pressure studied?Lithostatic pressure
Fluid pressure - 10Which pressure is due the weight of overlying layers at any point, & increase with depthLithostatic pressure
- 11Which kind of pressure is due to fluid phaseFluid pressure
- 12What is the Geostatic gradient?Rate of change of pressure towards the Earth's center
- 13What are the two types of oriented stress?Directional stress
Textural changes - 14What is directional stress?compression &
distension - 15Foliations are part of which kind of oriented stress?Textural changes
- 16What are the chemically reactive fluid characteristics?atomic and ionic changes
chemical and physical alteration
new minerals formation - 17Where can the chemical reactive fluids be found?Water
-Lake
-Sea
-Rivers
-Ocean - 18What are the types of metamorphism?classification base
regional metamorphism
contact metamorphism
burial metamorphism
high pressure and low temperature metamorphism
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- GEOL Geology Flashcards on Geology 2nd Midterm, created by itzel.jm on 12/11/2014.
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- itzel.jm
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