Lab 4_ Deformation and Geologic Maps_FA22.pdf

© Michelle Stoklosa 2020 1 Laboratory Exercise 4: Deformation, structural diagrams and geologic maps Introduction to Geology II: Earth’s Surface Processes Name____________________ Score: _______/25 Note: In this exercise, you are asked to draw on a few diagrams. The best (and preferred) way for you to do this is to print out the page(s) you need to draw on (pages 2 & 3 for this lab), sketch directly on them, then take a photo (or a scan) of your drawings. The images can then be embedded directly into the Word file that you submit or uploaded separately with your completed assignment. If you cannot print, you might instead just sketch these diagrams in a separate piece of paper, take photos of your sketches, and upload those with (or embed into) your lab exercise. INTRODUCTION In this exercise, we will be learning about the different types of deformation using structural block diagrams and geologic maps. You might want to have your textbook handy to see some examples of these structures. Note that we will be using the terminology for block diagrams as shown below (and explained in the tutorial video in Canvas) Ludman & Marshak, 2015 Part A: Strike and Dip Review the concept of strike and dip in Chapter 9 of your textbook and watch the associated video on the lab tutorial page, then proceed with task A1.

© Michelle Stoklosa 2020 2 Task A1: Determining direction of strike and dip DRAW strike and dip symbols on the map view (the top) of the block diagram below, then address the following questions. (1 point) Ludman & Marshak, 2015 Questions: (Each question worth 1 point) 1. In which direction are the beds striking, North to South or East to West (pick just one of these two choices)? 2. In which direction are the beds dipping down towards, North, South, East or West? (pick just one of these 4 choices) Task A2: Complete the block diagram Now complete the block diagram below by DRAWING in the layers on the front and sides . (1 point) Question: (1 point) 1. According to the strike and dip symbol on the block diagram above, towards which direction are the beds tilting downward, North, South, West, or East? (Assume North is to the back of the diagram, is with the diagram from Task A1.)

© Michelle Stoklosa 2020 3 Part B: Ductile Deformation & Block Diagrams Now we will look at some block diagrams and maps that illustrate ductile deformation. Please review the major ductile deformation structures in Chapter 9 of your textbook (anticline, syncline, basin, and dome), then continue. Task B1: Anticlines and synclines on block diagrams Review the lab tutorial video about how to draw an anticline on a block diagram, then address the questions below: Questions (Each question worth 1 point) 1. Show a syncline on the front of the blank block diagram below. Then complete the top and sides of the diagram. Ludman & Marshak, 2015 2. Complete the diagram below using the strike and dip symbols to guide you (complete both the front and the right side). Is this diagram showing an anticline or syncline? ___________________ Ludman & Marshak, 2015

© Michelle Stoklosa 2020 4 Task B3: Domes and Basins Domes and basins are broad downwarpings and upwarpings, respectively, of the lithosphere. Ludman & Marshak, 2015 Questions: (Each question worth 1 point) 1. For the diagrams above, does the left one show a basin or dome? 2. For the structure to the right , are the rocks exposed in the center the youngest or oldest rocks in the structure? Part C. Brittle Deformation and Block Diagrams Review the different categories of faults in your textbook. Figure 9.8 (the figure showing different categories of faults) will be especially useful to have on hand for this part of the exercise. Task C1. Strike slip fault Use the block diagram of a strike-slip fault below to answer the following questions. Ludman & Marshak, 2015

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