chapter 4 - ROCK TYPE Same chemical composition and...

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Understanding Earth Chapter 4: IGNEOUS ROCKS Solids from Melts Grotzinger • Jordan • Press • Siever
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Rocks and the Rock Cycle Rock: A naturally occurring aggregate of one or more minerals (e.g. granite), or a body of non- crystalline material (e.g. obsidian glass), or of solid organic material (e.g. coal). Rock Cycle : A sequence of events involving the formation, alteration, destruction, and reformation of rocks as a result of … magmatism, weathering, erosion, deposition, lithification, and metamorphism.
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The Rock Cycle The rock cycle is a set of geologic processes that convert one type of rock into another Concept expressed in James Hutton’s (1899) Theory of the Earth with proof and illustrations. . . Hutton also proposed “uniformitarianism”
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Minerals in Rocks
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Minerals in rocks
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Rock Properties 1. Mineralogy 2. Texture size and shapes of constituent minerals arrangement of the grains (minerals) in the rock are controlled by …. CHEMICAL COMPOSITION + PHYSICAL CONDITIONS MINERALOGY + TEXTURE
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Unformatted text preview: ROCK TYPE Same chemical composition and mineralogy Same textures Fine Grained Coarse Grained Comparing Rocks Lava flow Extrusive Rocks Basalt basalt through microscope minerals in a fine grained matrix vessicles Petrographic sections (30 ! m thick) in transmitted light (intrusive) (extrusive) Hydrous Minerals How do these factors affect magma formation? Why do certain minerals occur together in igneous rocks? Complexity of magma creation and interaction in the crust Terminology for igneous bodies Wall rock assimilation in magmas changes magma composition wall rock the contact Note increase in crystal size of the dike away from the contact Why? Sites of Magmatism Magmatism at Divergent Plate Boundaries Ocean Crust Fragments of these materials representing ancient oceanic crust (much older than modern ocean basins) are locally preserved on continents Seaoor hydrothermal systems NOAA...
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chapter 4 - ROCK TYPE Same chemical composition and...

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