Metamorphism and Metamorphic Rocks Answers 1-26

Metamorphism and Metamorphic Rocks Earth: An Introduction to Physical Geology Multiple-Choice Questions 1) Which of the following forms at the highest grade of regional metamorphism? A) hornfels B) schist C) slate D) phyllite Answer : B 2) What platy, parallel, mineral grains are the most visual aspect of foliated metamorphic rocks? A) micas B) feldspars C) carbonates D) quartz Answer : A Diff: 1 3) What major change occurs during metamorphism of limestone to marble? A) calcite grains grow larger and increase in size B) clays crystallize to micas, forming a highly foliated, mica -rich rock C) limestone grains react to form quartz and feldspars D) calcite grains are dissolved away leaving only marble crystals Answer : A Diff: 1 4) Which low-grade metamorphic rock, composed of extremely fine-sized mica and other mineral grains, typically exhibits well -developed rock cleavage? A) schist B) hornfels C) quartzite D) slate Answer : D Diff: 1 Match the rock with the appropriate description. A. hornfels B. marble C. gneiss D. phyllite 5) ________ forms by contact metamorphism of mudstones and shales Answer : A Diff: 1 6) ________ foliated, fine-grained metamorphic rock formed from mudstone and shale Answer : D Diff: 1 7) ________ nonfoliated metamorphic rock consisting mostly of calcite Answer : B Diff: 1 8) ________ coarse-grained, metamorphic rock with alternating bands or stringers of light and dark minerals Answer : C Diff: 1 9) ________ is thought to form by partial melting and in situ crystallization of the melted portion. A) Magmatite B) Magnetite C) Migmatite D) Megatite Answer : C Diff: 1 10) Tektites originate in what metamorphic environment? A) low pressure and high temperature associated with volcanism B) high temperatures associated with meteorite impacts C) very high pressures and temperatures associated with deep subduction D) high temperatures and shearing stresses in an oceanic -crust transform fault Answer : B Diff: 1 11) Which one of the following is not likely to be genetically associated with impact of an asteroid or large meteorite? A) tektites B) blueschists C) coesite D) impact crater Answer : B Diff: 1 12) Which of the following statements concerning slate is not true? A) forms from shales and mudstones B) has abundant, coarse-grained mica C) rock cleavage is common D) sedimentary features may be visible Answer : B Diff: 1 13) ________ is a strong, parallel alignment of coarse mica flakes and/or of different mineral bands in a metamorphic rock. A) Rock cleavage B) Foliation C) Stress streaking D) Marbleizing Answer : B Diff: 1 14) ________ is a nonfoliated rock formed by contact metamorphism of a shale or mudstone. A) Schist B) Marble C) Gneiss D) Hornfels Answer : D Diff: 1 15) Which of the following would exhibit sheared and mechanically fragmented rocks? A) fault movements at shallow depths B) intense compression in a deep-seated, regional metamorphic zone C) heating of shales and mudstones near a pluton D) regional metamorphism of pyroclastic volcanic rocks Answer : A Diff: 1 16) Which of the following best describes the conditions of contact metamorphism? A) Pressures are very high, the rock is deeply buried, and temperatures are raised by the Earth's internal heat. B) Pressures are fairly low, the rock is in the upper part of the crust, and heat is supplied from a nearby magma body. C) Heat is generated by shearing and mechanical movements along faults. D) Depths are fairly shallow, but temperatures and pressures are so high that the rocks begin to partially melt. Answer : B Diff: 1 17) ________ forms from the metamorphism of limestone or dolostone. A) Migmatite B) Amphibolite C) Marble D) Quartzite Answer : C Diff: 1 18) What foliated, metamorphic rock is texturally intermediate between slate and schist? A) fault breccia B) phyllite C) quartzite D) gneiss Answer : B Diff: 1 19) ________ is characterized by the segregation of light- and dark-colored minerals into thin layers or bands. A) Garnet hornfels B) Granitic gneiss C) Slate D) Quartzite Answer : B Diff: 1 20) What type of foliation results from the parallel alignment of abundant, coarse-grained, mica flakes in a metamorphic rock? A) schistosity B) gneissic banding C) slaty cleavage D) phyllitic structure Answer : A Diff: 1 21) Which of the following metamorphic rocks could be used to neutralize acidic mine waters? A) granite gneiss B) quartzite C) slate D) marble Answer : D Diff: 1 22) Which of the following lists the rocks in the order of increasing grain size and increasing grade of metamorphism? A) phyllite, slate, schist B) schist, slate, phyllite C) slate, phyllite, schist D) slate, schist, phyllite Answer : C Diff: 1 23) ________ is typically formed by metamorphism of a sandstone. A) Marble B) Slate C) Amphibolite D) Quartzite Answer : D Diff: 1 24) Which of the following rocks would exhibit visible, textural evidence of having undergone some partial melting? A) fault breccia B) migmatite C) slate D) foliated hornfels Answer : B Diff: 1 25) What is the major source of heat for contact metamorphism? A) deep burial and heat from the Earth's interior B) heat from grinding and shearing on faults C) heat from the spontaneous decomposition of micas and feldspars D) heat from a nearby magma body Answer : D Diff: 1 26) In which setting would regional metamorphism be most likely? A) at shallow depths below an oceanic ridge or rift zone B) at shallow depths along major transform faults in the continental crust C) at great depths in the crust where two continents are colliding D) at shallow depths beneath the seafloor where water pressures are immense Answer : C Diff: 2