Week 10 - Quiz 10 - Ch. 7 - Metamorphic Rocks
Certain minerals are only stable in a small range of temperatures and as such can tell us what temperature the rock metamorphosed at. We call these geobarometers. True False
False
Certain minerals are only stable in a small range of temperatures and as such can tell us what temperature the rock metamorphosed at. We call these isograds. True False
False
Certain minerals are only stable in a small range of temperatures and as such can tell us what temperature the rock metamorphosed at. We call these protoliths. True False
False
Contact metamorphism occurs where mountain chains form at convergent boundaries. True False
False
During contact metamorphism the rock is altered due to high temperatures and very high pressures. True False
False
In order of increasing metamorphic grade, the foliated rocks are: slate, phyllite, gneiss, schist, migmatite. True False
False
Marble is metamorphosed quartzite. True False
False
Metamorphism at convergent boundaries where mountain building occurs is referred to as contact metamorphism. True False
False
Metamorphism of the ocean crust due to hydrothermal fluids is referred to as contact metamorphism. True False
False
Metamorphism of the ocean crust due to hydrothermal fluids is referred to as regional metamorphism. True False
False
Quartzite is metamorphosed limestone. True False
False
Sandstone is metamorphosed Quartzite. True False
False
The rate at which the temperature increases with depth into Earth's interior is called the geothermometer. True False
False
Where rocks surrounding hot magmatic intrusions are altered due to high temperatures we get metasomatism. True False
False
Where rocks surrounding hot magmatic intrusions are altered due to high temperatures we get regional metamorphism. True False
False
What is the general term we apply to minerals that tell us the pressure at which the rock metamorphosed? Baromineral Geothermometer Geobarometer Thermomineral
Geobarometer
What is the general term we apply to minerals that tell us the pressure at which the rock metamorphosed? Geobarometer Baromineral Thermomineral Geothermometer
Geobarometer
What do we call the rate at which temperature increases from Earth's surface in to its interior? Geobarometric pressure Geothermal gradient Moho (Mohorovicic Discontinuity) Metamorphic grade
Geothermal gradient
What is the general term we apply to minerals that tell us the temperature at which the rock metamorphosed? Geobarometer Baromineral Thermomineral Geothermometer
Geothermometer
Which of the following foliated metamorphic rocks would be said to have the highest grade? Gneiss Phyllite Schist Slate
Gneiss
Which of the following rocks is a foliated metamorphic rock? Gneiss Hornfels Marble Quartzite
Gneiss
Which of the following sequences of foliated metamorphic rocks lists the rocks in correct order from highest grade to lowest grade? Slate, phyllite, schist, gneiss Gneiss, schist, phyllite, slate Schist, gneiss, phyllite, slate Phyllite, slate, gneiss, schist
Gneiss, schist, phyllite, slate
Which of the following rocks is the protolith (parent rock) of Marble? Sandstone Limestone Granite Basalt
Limestone
Which of the following rocks is NOT a foliated metamorphic rock? Slate Marble Gneiss Schist
Marble
What is metasomatism? Metamorphism due to pressure Metamorphism due to temperature Metamorphism of rock due to fluids Metamorphism due to impact by meteorite
Metamorphism of rock due to fluids
What are the two most dominant forms of metamorphism? Felsic and mafic (Bio)chemical and clastic Regional and contact Intrusive and extrusive
Regional and contact
Which of the following types of metamorphism is the most common (due to covering large areas)? Contact metamorphism Shock metamorphism Metasomatism Regional metamorphism
Regional metamorphism
Which of the following types of metamorphism would best describe metamorphism at convergent boundaries? Contact metamorphism Metasomatism Shock metamorphism Regional metamorphism
Regional metamorphism
Which of the following statements is the most fitting description of metamorphic rocks? Rocks formed from the alteration of pre-existing rocks due to high temperatures and/or pressures Rocks formed from the alteration of loose sediments due to chemically-rich waters Rocks formed from the cooling and crystallization of liquid rock Rocks formed from the accumulation of chunks of pre-existing rocks
Rocks formed from the alteration of pre-existing rocks due to high temperatures and/or pressures
Which of the following statements is the most fitting description of metamorphic rocks? Rocks formed from the cooling and crystallization of liquid rock Rocks formed from the alteration of pre-existing rocks due to high temperatures and/or pressures Rocks formed from the accumulation of chunks of pre-existing rocks Rocks formed from the alteration of loose sediments due to chemically-rich waters
Rocks formed from the alteration of pre-existing rocks due to high temperatures and/or pressures
Which of the following rocks is the protolith (parent rock) of Quartzite? Basalt Limestone Granite Sandstone
Sandstone
Which of the following foliated metamorphic rocks would be said to have the lowest grade? Phyllite Slate Gneiss Schist
Slate
Which of the following sequences of foliated metamorphic rocks lists the rocks in correct order from lowest grade to highest grade? Slate, phyllite, gneiss, schist Gneiss, schist, phyllite, slate Slate, phyllite, schist, gneiss Phyllite, slate, gneiss, schist
Slate, phyllite, schist, gneiss
Which of the following reasons is NOT a reason why some metamorphic rocks have no foliation? Temperature and pressure were too high Parent rock is chemically uniform (i.e. made of one, very stable, mineral) There was no directed pressure present at metamorphism There are no platy minerals present in the parent rock
Temperature and pressure were too high
Which of the following statements is the best description of the term "protolith"? The layering that we see in some of the metamorphic rocks The dark bands sometimes seen in Marble The large minerals that tell us the temperature and pressure at which the rock formed The rock that the metamorphic rock used to be before it was metamorphosed
The rock that the metamorphic rock used to be before it was metamorphosed
Certain minerals are only stable in a small range of temperatures and as such can tell us what temperature the rock metamorphosed at. We call these geothermometers. True False
True
During contact metamorphism the rock is altered mostly due to high temperatures rather than high pressures. True False
True
In order of increasing metamorphic grade, the foliated rocks are: slate, phyllite, schist, gneiss, migmatite. True False
True
Marble is metamorphosed limestone. True False
True
Metamorphism at convergent boundaries where mountain building occurs is referred to as regional metamorphism. True False
True
Metamorphism of the ocean crust due to hydrothermal fluids is referred to as metasomatism. True False
True
Metasomatism mainly causes metamorphism due to alteration of rocks from hot fluids. True False
True
Quartzite is metamorphosed sandstone. True False
True
Regional metamorphism occurs where mountain chains form at convergent boundaries. True False
True
The formal term for the rock a metamorphosed rock used to be before metamorphism is "protolith". True False
True
The rate at which the temperature increases with depth into Earth's interior is called the geothermal gradient. True False
True
When large meteorites hit Earth they can alter rocks due to very high pressures - we call this shock metamorphism. True False
True
Where rocks surrounding hot magmatic intrusions are altered due to high temperatures we get contact metamorphism. True False
True
What is an isograd? The formal term for the parent rock (i.e. what the metamorphic rock was before it was metamorphosed) Large minerals that stand out in a metamorphic rock because the other minerals are much smaller An imaginary line separating different grades of metamorphism based on minerals present A mineral that tells us the temperature at which metamorphism occurred
An imaginary line separating different grades of metamorphism based on minerals present
In which of the following settings would metasomatism occur? Around impact sites where large meteorites strike the earth Around hot magmatic intrusions At divergent boundaries where hydrothermal vents form At convergent boundaries where mountain belts are forming
At divergent boundaries where hydrothermal vents form
Which of the following types of metamorphism would include alteration of rock due to heat from a magmatic intrusion? Shock metamorphism Contact metamorphism Regional metamorphism Metasomatism
Contact Metamorphism
Which of the following statements is true about the geothermal gradient where Earth's crust is thicker than average? The thickness of the crust makes no difference, when the crust is thicker than average the geothermal gradient is exactly the same as that through crust of average thickness. Under thicker crust there is no geothermal gradient, it only applies to crust of average thickness or less Under thicker crust the geothermal gradient is steeper (i.e. a greater change in temperature, with depth) Where the crust is thicker, the geothermal gradient will be shallower (i.e. smaller change in temperature with distance)
Where the crust is thicker, the geothermal gradient will be shallower (i.e. smaller change in temperature with distance)
