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Unformatted text preview: Exam 2, Geo416M, October 23, 2007 There is no talking or use of any resources during this exam. There are 50 questions. 1. Name this common sulfate mineral: CaSO 4 ·2H 2 O a. gypsum b. anhydrite c. apatite d. dolomite e. chert 2. What conditions are required to form evaporite minerals? a. water input must exceed water evaporation b. isolation from open ocean/lake water (commonly by a barrier) c. no rainfall d. an adjacent desert with sand dunes e. all of the above 3. The displacive growth of evaporite minerals in a muddy substrate can result in _____________. a. chickenwire texture b. varves c. Laminations d. banded iron formations 4. Chert may not form by _____________. (A) accumulation of diatom and radiolarian organisms (B) inorganic precipitation from seawater (C) diagenetic replacement in carbonates (D) polishing (sandblasting) quartz-rich granite 5. Which of the following statements about banded iron formations (BIFs) are true? (A) BIFs contain large amounts of chert (B) BIFs contain > 15% iron (C) most BIFs are younger than 550 million years old (D) BIFs are the source of significant iron ore in the Great Lakes region of the U.S.A. (E) A, B, and D only 6. Coal will form only _____________ . a. in high energy environments b. in O 2-rich environments c. in environments where organic matter is preserved d. in mountain belts 7. Which rank (class) of coal contains the greatest amount of carbon? a. anthracite b. bitumen c. lignite d. peat 8. The principal goal of sedimentary lithofacies analysis for clastic rocks is _____________ . (A) to locate hydrocarbons (B) to estimate porosity and permeability (C) to interpret depositional process and depositional environment (D) to interpret the original water depth of deposition 9. Which of the following statements about architectural analysis of clastic rocks are true? (A) different bounding surfaces identify a range of spatial scales for different processes (B) each package of rock represents a different depositional environment (C) the method is focused on vertical variability of lithofacies (D) the method can only be conducted on rock cores collected from wells (E) A and B only 10. Till refers to _____________ . (A) any coarse-grained sediment (B) coarse-grained sediment deposited directly by a glacier (C) the contact between a glacier and a standing body of water (lake or ocean) (D) the basal scour surface below a glacier 11. In glacial systems, the equilibrium line _____________ . (A) separates the accumulation zone from the ablation zone (B) is the contact between a glacier and a standing body of water (lake or ocean) (C) is defined by the position of the end moraine (D) is the basal scoured surface below a glacier 12. For an alluvial fan, a horizontal cross section proceeding from upslope to downslope regions (and oriented perpendicular to the mountain front) exhibits a characteristic _____________ profile....
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This note was uploaded on 04/27/2008 for the course GEO 416M taught by Professor Staff during the Spring '08 term at University of Texas.
- Spring '08