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.