# Answers: Internal Processes and Structures (Isostasy)

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1 Answers: Internal Processes and Structures (Isostasy) 1. Analyse the adjustment of the crust to changes in loads associated with volcanism, mountain building, erosion, and glaciation by using the concept of isostasy Isostasy refers to the concept of how the lithosphere floats on top of the asthenosphere. As a volcano is adding dense rock to the crust the lithosphere will sink lower into the asthenosphere. Mountain building is a result of the crust being folded, and this will cause the lithosphere to sink further into the asthenosphere. However, the opposite occurs during erosion as sediment is carried off the mountain the crust will rebound and float higher. During the ice ages the massive ice sheets pushed down on the continental crust to make it float lower. As the ice sheets melted the continental crusts has rebounded. So Northern Canada and Scandinavia are still rising. 2. Explain how mountains can rise even though they are eroding? Mountains can rise even though being eroded because as a lot of material is carried off the mountain top the lithosphere floats higher. 3. Which of the following is a result of isostatic adjustment? a) Glacial flow down a valley b) Crust sinking beneath a delta c) Displacement along a transform fault d) Mountain building at a convergent plate boundary 4. Which of the following before and after sequences shows the correct Isostatic response? Use the following map that shows rates of crustal uplift in Scandinavia to answer question 5. The numbered lines join points of equal crustal uplift. 5. At location X, the crust is rising a) fastest because this is where the Pleistocene ice cap was the thickest. b) fastest because this is where the Pleistocene ice cap was the thinnest. c) slowest because this is where the Pleistocene ice cap was the thickest. d) slowest because this is where the Pleistocene ice cap was the thinnest Answers to Workbook 4

2 Use the following diagram to answer question 6 and After the sediments have been eroded, location X in the granite will be at a higher elevation above sea level. What is the name given to this process. Isostasy 7. Describe why the granite is now above sea level. As the overlying sediment erodes weight is removed from the lithosphere. As a result the lithosphere crust can float higher on the asthenosphere. The granite batholith will be at a higher elevation than before. Use the following cross-section of part of the coast of western Vancouver Island to answer question 8 8. One prominent feature of the coastal section is the series of beaches at different heights above sea level. Give two geologically reasonable explanations for how the beaches could have formed. The first should involve plate tectonics, and the second explanation should involve glaciation. Draw diagrams to help illustrate your answer. a) Explanation 1 (Plate Tectonics) Vancouver Island rises as the Juan de Fuca plate subducts below the North American plate. The tremendous forces of collision lift and create mountains, thus leaving beaches abandoned. b) Explanation 2 (Glaciation) During the ice age the enormous weight of the glaciers pushed the lithosphere down. But when the glaciers melted the weight was removed and the lithosphere has rebounded, thus leaving beaches abandoned. In this diagram the two beaches furthest west are submerged because the lithosphere has sunk lower Answers to Workbook 4

3 Answers: Internal Processes and Structures (Structural Geology) 1. Describe the factors that determine if a rock will behave in a plastic or brittle manner when stressed. When rocks behave in a plastic manner they undergo a large deformation for little added stress. The rock will not return to its original shape. When rocks behave in a brittle manner the rocks break before any real plastic deformation occurs. Temperature and pressure both affect whether a rock will behave in a plastic manner or brittle: there is more temperature and pressure inside the Earth, and these rocks tend to behave in a more plastic manner than those colder and less pressurized rocks near the surface. Another factor is tensile vs. compression stress. Different rocks behave differently when subjected to squeezing or pulling. Or the same rock may behave in a plastic manner when compressed, but a brittle manner when stretched. 2. Distinguish between faults and joints. Where there is no movement along a fracture in the rocks it is a joint, but if there is relative movement it is a fault. 3. Draw dip-slip (normal, reverse, thrust), strike-slip (left lateral, right lateral), and transform faults. Include arrows showing appropriate forces associated with the various types of faults (compressional, tensional and shear forces.) Normal Fault If the hanging wall (above) moves down relative to the footwall (below). Tensional forces. Hanging Wall Hanging Wall Footwall Reverse Fault If the hanging wall moves up relative to the footwall. Compressional forces. Footwall Thrust A reverse fault with a very shallow (low angle) dip. Compressional forces Answers to Workbook 4

4 Strike Slip (Transform) If the relative movement along a fault is horizontal in the direction of the strike. This diagram is a right lateral strike slip fault. Shear forces. 4. Draw a diagram to explain the dip and strike of a structure. Strike is the compass direction of a line formed by the horizontal and inclined rock layers. Dip is the angle between the horizontal and inclined rocks. The strike and dip symbol would be: (Note that the symbol is always a perpendicular capital T.) Answers to Workbook 4

5 5. Draw a dome, basin, anticline, syncline, and overturned fold, and include arrows showing appropriate forces associated with these structures. Anticlines Synclines An upward fold A downward fold The oldest rocks are in the middle and the youngest rocks have eroded The youngest rocks are in the middle and the oldest rocks deep underneath Overturned folds The fold is tilted to the horizontal The limb is folded right over. Basin A downward fold in a circle. The youngest rocks are in the middle and the oldest rocks deep underneath Dome An upward fold in a circle. The oldest rocks are in the middle and the youngest rocks are eroded. Note: all folds are formed by compressional forces as found at converging plate boundaries Answers to Workbook 4

6 6. Which of the following block diagrams shows a left lateral strike-slip fault? 12. A fault that results from crustal stretching is represented in diagram A is a normal fault in which the block to the right, the hanging wall, has slipped down relative to the footwall. 13. Thrust faults would most likely occur at plate boundaries that are a) divergent b) transform c) convergent d) constructive 14. What type of faulting commonly occurs as a result of tensional stresses? a) Reverse fault b) Normal fault c) Thrust fault d) Strike slip fault Use the following diagram to answer question The structures shown in the diagram most likely formed at a boundary where the plates were a) moving apart. b) rising upwards c) coming together d) sliding past each other. These are all normal faults Answers to Workbook 4

7 16. Which of the geologic map symbols represent a tilted rock layer with a strike of 0 degrees and a dip of 45 degrees east? a) b) c) d) 17. When excessive stress is applied to rocks at great depth where temperatures and confining pressures are higher, the rocks are likely to a) rupture in a brittle fashion b) deform in a plastic manner c) continue to behave elastically, without any permanent effects of strain d) rupture in a brittle fashion initially and then begin to deform or bend in a plastic fashion Use the following map to answer question 18 and Which of the following sketches corresponds to the cross section along X and Y in the map above? 19. The name given to this structure is a) anticline b) syncline c) thrust fault d) basin 20. Which layer is the oldest? a) Black shale b) Red sandstone c) Grey limestone d) Cannot be determined e) Use the following geologic block diagram to answer questions 21 to There has been no vertical movement on fault F. Fault F would be best classified as a a) normal dip-slip fault. b) reverse dip-slip fault. c) left lateral strike-slip. d) right lateral strike-slip Answers to Workbook 4

8 22. The fold shown on the block diagram would be best described as a a) plunging syncline. b) plunging anticline. c) non-plunging syncline. d) non-plunging anticline. 23. Location P lies on the contact between the shale and the sandstone. The correct strike and dip symbol at location P would be Use the following map to answer questions 24 to Fault F would be classified as a) thrust b) normal c) reverse d) strike slip 25. Which layer is the oldest? a) limestone b) sandstone c) shale d) granite The graptolite in the limestone is older than the brachiopod in the shale. Therefore, the centre sandstone must be even older 26. What is the name of the fold which has affected the sedimentary rocks? a) Syncline. b) Anticline. The oldest rocks are in the middle, c) Plunging syncline. therefore it s an anticline. d) Plunging anticline. 27. Describe one change you would expect to see in the fossiliferous limestone due to contact metamorphism near the granite intrusion. The fossils would be destroyed by metamorphism. The limestone would be more like marble. The limestone would loose porosity 28. What changes in crystal size would be observed by a geologist as she walked the 200 metre section from X to Y across the granite? The crystals would become larger, because the cooling time would have been longer further from the edge of the granitic intrusion Answers to Workbook 4

9 29. The contact between the granite and the shale at position P is dipping to the west. The correct strike and dip symbol at position P is Use the following sketch map of a geological structure to answer question The geological structure shown in the sketch map is either a dome or a basin. a) Give evidence involving: i) the dip and strike of the strata, and ii) the ages of the strata that a geologist could look for to prove whether the structure is a dome or a basin. i) Evidence using the dip and strike of the strata: If it were a dome all the strata, rock layers, would dip away from the centre, whereas if it were a basin all the strata would dip toward the centre. ii) Evidence using the ages of the strata: If it were a dome the oldest rocks would be at the centre, whereas if it were a basin the youngest rocks would be at the centre. b) A vertical hole drilled at location X on the structure encountered three different rock strata. Assuming that the structure is a dome, sketch, in the space provided below, the first three strata that would be encountered in the drill hole. 31. Which sketch represents a map view of a plunging anticline? A B C D Answers to Workbook 4

10 32. Explain why you made your choice for question 31. Anticlines have their oldest rocks in the middle, the Mesozoic occurred before the Cenozoic. A plunging fold occurs when the fold axis dips down from the horizontal. In this case the plunge is to the southeast. 33. In the space provided below, sketch and clearly label a cross section that contains an anticline cut by a reverse fault Answers to Workbook 4

11 Use the following map of exposed sedimentary rock layers to answer question 34 Oldest Youngest 34. The map above has been constructed by sampling the surface rocks and measuring strike direction and dip angles. a) Complete the cross section for the map area above. See above b) Name the structure found between X and Y Syncline c) Label the oldest layers and youngest layer See diagram above Answers to Workbook 4

12 Use the geological map on this page to answer questions 35 to The orientation of the strata shown on the Geological Map is a) strike east, dip 30 degrees north. b) strike south, dip 30 degrees east. c) strike north, dip 30 degrees west. d) strike west, dip 30 degrees south. 36. The movement along structure X on the Geological Map is entirely vertical. Structure X is most likely a a) joint. b) dip-slip fault. c) unconformity. d) strike-slip fault. Use the following map of outcrops to answer question This map includes the geology of various outcrops in a small region. It reveals a geological structure. a) Complete the map view of the geologic structure on the diagram. See above b) Name the geological structure. Give evidence to support your answer. A syncline because the youngest layer is in the middle c) Draw the correct strike dip symbol in the box on the diagram. See above. The strike dip direction is about 45 0 NW, but the dip angle cannot be determined Answers to Workbook 4

13 Use the following map to answer questions 38 to 43 on the next page. The map area is generally flat except for the northeast section where the land surface rises steeply in a hill formed from nearly horizontal layers of schist, gabbro and quartzite units. 38. Name the type of fold which is shown on the flat part of the map and describe, with reference to the available geologic evidence, how the fold would likely have formed. It is a dome. This is because of the general shape of the structure circular, and because the oldest rocks are in the middle of the structure. 39. Would the type of stress that formed the fault have been compressive, tensional or horizontal shear? There is no indication of any vertical displacement and so the fault must be due to horizontal shear, it is a strike slip fault. 40. Describe how the schist, gabbro and quartzite units may have come to be overlying the folded rocks and give evidence, from the geologic map, for your reasoning. The schist, gabbro and quartzite units are not of the same general shape as the dome and they are indeed much older than the rocks of the dome. In addition, these overlying units have been metamorphosed. The schist, gabbro and quartzite units have likely been thrust faulted over the top of the dome units. However, the sequence could be accreted material along an old coastline. 41. The gabbro unit has a rich concentration of magnetite towards its base. Describe how the magnetite was concentrated in this way. The magnetite was concentrated by crystal settling, while the gabbro was cooling. The magnetite crystallizes from the magma melt and settles to the bottom of the chamber because it is more dense than the magma. 42. Place the following events in correct order Events in random order Events in correct order Intrusion of the gabbro Formation of the fault Youngest Deposition of the limestone Intrusion of the diorite Formation of the fault Intrusion of the diorite Deposition of the limestone Intrusion of the gabbro Metamorphism to form the schist Metamorphism to form the schist Oldest 43. List in the correct order, the name and age of the first five rock units which would be encountered in a drill hole at point Z. Order Name of rock unit and age 1st 2nd 3rd 4th 5th Pleistocene sediment Oligocene siltstone Limestone Sandstone Green shale Answers to Workbook 4

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