GEO_f416M_2010SU_1st_exam_key

GEO_f416M_2010SU_1st_exam_key - GEO416M, Sedimentary Rocks,...

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GEO416M, Sedimentary Rocks, 2010 Summer Exam 1, June 21 - 2010, Siliciclastic Sediments and Rocks 1 Name_______________________________ UT EID______________________________ Total 50 multiple-choice questions: each question worth 2 points. 2 points awarded for turning in the paper exam questions with name and correct UT EID written on front page Correct answer in red 1) The Shields diagram summarizes the environmental conditions associated with a) suspended sediment transport b) threshold of sediment motion c) turbulent versus laminar flow d) development of antidunes 2) The median particle size for the cumulative grain size curve in Figure 1 is a) 1.00 ! b) 1.75 ! c) 2.35 ! d) 3.40 ! 3) Which does NOT explain porosity correctly a) measure of a deposit to transmit interstitial fluid b) measure of fluid flow through the pore network c) about 70% for well-sorted sand near surface d) a function of grain size and sorting 4) Which line in Figure 2 represents the most well-sorted grain size distribution a) A b) B c) C d) D 5) Flow direction for the imbricated particles in Figure 3 is from a) 1 to 2 b) 2 to 1 c) 3 to 2 d) 2 to 3 6) The deposit with the lowest permeability is a) well sorted fine sand b) poorly sorted fine sand c) well sorted medium sand d) poorly sorted coarse sand 7) Figure 4 is an example of a) convoluted bedding b) fluidization c) cross bedding d) pillar structures 8) Figure 5 is an example of a) flute marks b) rain-drop imprints c) mud cracks d) pillar structures 9) Paleocurrent direction in Figure 5 is from a) 1 to 2 b) 2 to 1 c) 3 to 2 d) 2 to 3 10) The grain in the center of Figure 6 is a) feldspar b) monocrystalline quartz c) rock fragment d) polycrystalline quartz 11) History of augite (A) grain diagenesis is (see Figure 7) a) growth of rim – replacement – growth of rim – dissolution b) dissolution - growth of rim – dissolution – carbonate precipitation c) growth of rim – dissolution – growth of rim – dissolution d) overgrowth – carbonate cementation – overgrowth – carbonate cementation 12) Based on Figure 8, a sandstone with sand grains that are 6% feldspar grains, 92% quartz grains and 2% lithic grains, and has 40% matrix is a a) quartz arenite
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GEO416M, Sedimentary Rocks, 2010 Summer Exam 1, June 21 - 2010, Siliciclastic Sediments and Rocks 2 b) feldspathic arenite c) quartz wacke d) lithic wacke 13) Froude number at X in Figure 9 is a) Fr > 1 b) Fr < 1 c) Fr = 1 d) none of the above 14) Physical weathering processes include: a) thermal expansion/contraction, ionization, frost action, organic cracking b) abrasion, reduction, frost action, thermal expansion/contraction c) abrasion, thermal expansion/contraction, frost action, organic cracking d) abrasion, thermal expansion/contraction, frost action, congruent solution 15) Hydrolysis a) produces clay minerals b) uses free hydrogen ions c) acts on feldspars d) all of the above 16) Boundary shear stress is equal to the product of fluid density and a) settling velocity
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This note was uploaded on 01/19/2012 for the course GEO 416M taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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GEO_f416M_2010SU_1st_exam_key - GEO416M, Sedimentary Rocks,...

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