LAB3.docx - Module 3 Lab Igneous Rocks and Volcanism What mineral composition is most characteristic of felsic rocks orthoclase quartz and biotite What

LAB3.docx - Module 3 Lab Igneous Rocks and Volcanism What...

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Module 3 Lab: Igneous Rocks and Volcanism What mineral composition is most characteristic of felsic rocks? orthoclase, quartz, and biotite What mineral composition is most characteristic of mafic rocks? olivine, pyroxene, and calcium-rich plagioclase What mineral composition is most characteristic of intermediate rocks? sodium-rich plagioclase and hornblende with some quartz or biotite When mafic lava breaks through fissures in the continent crust, which of the following often results? lava plateaus Which scenario is associated with mafic magma? hot, fluid lava that forms a shield volcano Which scenario is associated with felsic magma? an explosive eruption that ejects pyroclastic materials Wizard Island in Crater Lake, Oregon, is an example of a cinder cone A porphyritic rock forms when there is a period of slow cooling, followed by more rapid cooling A porphyritic rock contains both ________ and __________. phenocrysts; groundmass Specimen #2 has a phaneritic texture Specimen #2 crystallized from a felsic magma
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Unformatted text preview: Specimen #2 is granite. Specimen #5 is Obsidian Specimen #6 is Pumice Specimen #7 has a phaneritic texture Specimen #7 crystallized from an intermediate magma Specimen #7 is diorite. Specimen #8 is an intermediate igneous rock Specimen #8 is porphyritic andesite Specimen #9 crystallized from a mafic magma. Specimen #9 is Gabbro Specimen #10 is Basalt Specimen #1 is Granite Specimen #3 is Tuff Specimen #4 is Rhyolite Which of the following statements best describes Sample #1? It formed slowly underground from felsic magma. Which of the following statements best describes Sample #4? It formed quickly on the surface from felsic lava What location is associated with the composition of the magma that formed Sample #4? . continental hot spots Which of the following statements best describes Sample #6? It formed from felsic lava as gas bubbles escaped What type of plate boundary is associated with the magma that formed Sample #9? divergent boundary...
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  • Fall '19
  • Lab 3

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