Chapter ^ review - Chapter 6 Question review Christian...

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Chapter 6 – Question review Christian Smith 1. In Earth's crust, igneous rocks exceed sedimentary rocks in volume. Neither rock type is evenly distributed. In the interiors of continents, sedimentary rocks occur as thin veneers covering over much larger volumes of igneous and metamorphic rocks deeper in the crust. Ocean basin rocks are mainly igneous with very thin covers of sediments. Sedimentary strata many kilometers in thickness accumulate only in relatively restricted basins along the edges of continents or in deep rift basins where continental blocks are splitting apart. 2. sum of all processes, chiefly chemical, by which changes in a sediment are brought about after its deposition but before its final lithification . Because most sediments contain mineral mixtures in which not all the minerals are in chemical equilibrium with each other, changes in interstitial water composition or changes in temperature or both will usually lead to chemical alteration of one or more of the minerals present. 3. False 4. The three, most common, chemical cements in sedimentary rocks such as sandstone are silica, calcium carbonate, and the iron oxides. Calcite- cemented sandstones are typically light colored, and the calcite reacts vigorously with dilute HCl or other acids. Quartz-cemented sandstones are also light colored, but they do not visibly react with acids and the cementing material is quite hard. Sandstones with iron oxide cements are easy to recognize by their red, yellow, or brown colors.
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  • Spring '13
  • NguyenVanVuong
  • Sedimentary rocks, Christian Smith

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