Metamorphic Rock and Mineral Geology

CHAPTER 8 Metamorphic Rock and Mineral Geology

In this chapter we discuss Metamorphic Rock and Mineral Geology.


What term describes a strong, parallel alignment of coarse mice flakes and/or different bands in a metamorphic rock?

Foliation


What metamorphic environment produces tektites?

High temperatures associated with meteorite impacts


What metamorphic rock forms during the metamorphism of limestone or dolostone?

Marble


What is the major source of heat for contact metamorphism?

Heat from a nearby magma body


In which setting would regional metamorphism be most likely?

At great depths in the crust where two continents are colliding


What term describes the zone of contact metamorphism that surrounds an intrusive magma body?

Aureole


Which of the following situations would exhibit sheared and mechanically fragmented rocks?

Fault movements at shallow depths


Which of the following rock types form during the highest grade of regional metamorphism?

Schist


What metamorphic rock forms from sandstone?

Quartzite


During metamorphism, what is the major effect of chemically active fluids?

They aid in the movement of dissolved silicate constituents and facilitate growth of the mineral grains.


Which low-grade metamorphic rock, composed of extremely fine-sized mica and other mineral grains, typically exhibits well developed rock cleavage?

Slate


What type of metamorphic facies associated with the subduction of oceanic crust and sediments forms at very high pressure but moderately low temperature?

Blueschist-


What nonfoliated metamorphic rock forms during contact metamorphic of a shale or mudstone?

Hornfelds


What type of foliation results from the parallel alignment of abundant, coarse-grained, mica flakes in a metamorphic rock?

Schistosity


What platy, parallel mineral grains are the most visual aspect of foliated metamorphic rocks?

Micas


Which of the following lists foliated metamorphic rocks in the order of increasing grain size and increasing grade of metamorphism?

Slate, phyllite, and schist


Of the following rock types, which is characterized by the segregation of light- and dark-colored minerals into thin layers or bands?

Granitic geniss


Which one of the following is not likely to be genetically associated with and impact of asteroid or large meteorite?

Blueshists


What major change occurs during metamorphism of limestone to marble?

Calcite grains increase in size


What foliated, metamorphic rock is texturally intermediate between slate and schist?

Phyllite


Which of the following statements concerning slate is not true?

Slate has abundant, coarse-grained mica


Which of the following best describes the conditions of contact metamorphism?

Pressures are fairly low, the rock may be in the upper part of the crust, and heat is supplied from a nearby magma body such as a pluton, dike, or sill.


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