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Viscous magma is associated with which type of eruption?
Explosive/pyroclastic eruption
Regional metamorphism is not common in which type of plate boundary?
Divergent boundary
What is foliation?
It is a metamorphic texture that refers to any planar fabric such as layering of dark and light bands or orientation of platy minerals.
When magma evolves to highest viscosity and piles up at the volcano’s central vent acting like a plug a what is formed:
Lava dome
Which of the following is are common metamorphic process?
Which type of metamorphism occurs over wide ranges of temperatures and pressures, over a wide geographic area, is associated with convergent tectonic settings where mountain building occurs, and produces foliated rocks like gneiss?
Regional metamorphism
How are metamorphic rocks formed?
Alteration of preexisting rocks from increased temperatures and pressures
What are the two factors used to classify metamorphic rock?
What are Index minerals?
Certain metamorphic minerals that can be used to identify Temperature-Pressure conditions that a rock went through.
Flood basalt eruptions are rare, but long lasting and can have major impacts globally because of what?
Large volumes of volcanic gas and ash being emitted.
High grade metamorphism
Where would a type of metamorphism that occurs at a relatively low temperature and high pressure environment, metamorphosing mafic igneous rocks into blueschist facies take place?
*Hint: It occurs at a plate boundary.
Subduction zone
Describe a shield volcano.
Shield volcano has a central vent, broad gentle sloping sides, and is formed mostly by low viscosity mafic lava flows
Limestone is the protolith for which metamorphic rock?
Marble
Define Low grade metamorphism:
When a metamorphic rock had formed under lower temperature and/or pressure conditions.