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B. Plate tectonics: mid-ocean ridges Part 1 On Figure 1, below, the diagrams labeled "MAR" and "EPR" show the distribution of crustal ages around two spreading ridges, loosely modeled after the Mid-Atlantic Ridge and the East Pacific Rise. The diagrams show the age patterns on one side of each ridge axis. Assume that these patterns are symmetric around the ridge axes. Base your answers on what is shown in these diagrams. 02 9 0 0 20 0 T T T 35 Age (myrs) 52 500 1000 Distance from Ridge (km) 500 65 Age (myrs) 20 1500 30 1000 Distance from Ridge (km) Figure 1 - Age-distance of Oceanic Crust away from Mid-Atlantic and East Pacific Ridges. 1500 Mid-Atlantic Ridge (MAR) East Pacific Rise (EPR) B1. Calculate mean half-spreading rates (in cm/yr and in km/m.y.) for each ridge. Explain how you obtained these answers. B2. Plot graphs of distance (km, x-axis) vs. water depth (km, y-axis) for the two ridges, assuming the general relationship of depth-age for the oceanic lithosphere given in Part A. Show your calculations for how you arrived at the depths you plotted. Make sure to label the axes with the variables and units, and that the direction of the y-axis is such that deeper in the ocean is down on your graph. B3. Describe why the depth-distance gradients differ for the two ridges as a consequence of spreading rate differences.

B. Plate tectonics: mid-ocean ridges Part 1 On Figure 1, below, the diagrams labeled "MAR" and "EPR" show the distribution of crustal ages around two spreading ridges, loosely modeled after the Mid-Atlantic Ridge and the East Pacific Rise. The diagrams show the age patterns on one side of each ridge axis. Assume that these patterns are symmetric around the ridge axes. Base your answers on what is shown in these diagrams. 02 9 0 0 20 0 T T T 35 Age (myrs) 52 500 1000 Distance from Ridge (km) 500 65 Age (myrs) 20 1500 30 1000 Distance from Ridge (km) Figure 1 - Age-distance of Oceanic Crust away from Mid-Atlantic and East Pacific Ridges. 1500 Mid-Atlantic Ridge (MAR) East Pacific Rise (EPR) B1. Calculate mean half-spreading rates (in cm/yr and in km/m.y.) for each ridge. Explain how you obtained these answers. B2. Plot graphs of distance (km, x-axis) vs. water depth (km, y-axis) for the two ridges, assuming the general relationship of depth-age for the oceanic lithosphere given in Part A. Show your calculations for how you arrived at the depths you plotted. Make sure to label the axes with the variables and units, and that the direction of the y-axis is such that deeper in the ocean is down on your graph. B3. Describe why the depth-distance gradients differ for the two ridges as a consequence of spreading rate differences.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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B. Plate tectonics: mid-ocean ridges Part 1 On Figure 1, below, the diagrams labeled "MAR" and "EPR" show the distribution of crustal ages around two spreading ridges, loosely modeled after the Mid-Atlantic Ridge and the East Pacific Rise. The diagrams show the age patterns on one side of each ridge axis. Assume that these patterns are symmetric around the ridge axes. Base your answers on what is shown in these diagrams. 02 9 0 20 0 9 35 EART102: Marine Geology, W20 Age (myrs) 52 500 500 1000 Distance from Ridge (km) 65 Age (myrs) 20 1500 1500 30 1000 Distance from Ridge (km) Figure 1 - Age-distance of Oceanic Crust away from Mid-Atlantic and East Pacific Ridges. Mid-Atlantic Ridge (MAR) East Pacific Rise (EPR) B1. Calculate mean half-spreading rates (in cm/yr and in km/m.y.) for each ridge. Explain how you obtained these answers. B2. Plot graphs of distance (km, x-axis) vs. water depth (km, y-axis) for the two ridges, assuming the general relationship of depth-age for the oceanic lithosphere given in Part A. Show your calculations for how you arrived at the depths you plotted. Make sure to label the axes with the variables and units, and that the direction of the y-axis is such that deeper in the ocean is down on your graph. B3. Describe why the depth-distance gradients differ for the two ridges as a consequence of spreading rate differences.
Transcribed Image Text:B. Plate tectonics: mid-ocean ridges Part 1 On Figure 1, below, the diagrams labeled "MAR" and "EPR" show the distribution of crustal ages around two spreading ridges, loosely modeled after the Mid-Atlantic Ridge and the East Pacific Rise. The diagrams show the age patterns on one side of each ridge axis. Assume that these patterns are symmetric around the ridge axes. Base your answers on what is shown in these diagrams. 02 9 0 20 0 9 35 EART102: Marine Geology, W20 Age (myrs) 52 500 500 1000 Distance from Ridge (km) 65 Age (myrs) 20 1500 1500 30 1000 Distance from Ridge (km) Figure 1 - Age-distance of Oceanic Crust away from Mid-Atlantic and East Pacific Ridges. Mid-Atlantic Ridge (MAR) East Pacific Rise (EPR) B1. Calculate mean half-spreading rates (in cm/yr and in km/m.y.) for each ridge. Explain how you obtained these answers. B2. Plot graphs of distance (km, x-axis) vs. water depth (km, y-axis) for the two ridges, assuming the general relationship of depth-age for the oceanic lithosphere given in Part A. Show your calculations for how you arrived at the depths you plotted. Make sure to label the axes with the variables and units, and that the direction of the y-axis is such that deeper in the ocean is down on your graph. B3. Describe why the depth-distance gradients differ for the two ridges as a consequence of spreading rate differences.
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Here's the depth-age relation, sorry!

Depth-age of oceanic crust: D = 2650 + 320 * t¹/2 (D is in meters, and t is in m.y.) (Despite flattening in the age-depth curve for crust older than 70 Ma, you can use this formula for all of the lithosphere.)
Transcribed Image Text:Depth-age of oceanic crust: D = 2650 + 320 * t¹/2 (D is in meters, and t is in m.y.) (Despite flattening in the age-depth curve for crust older than 70 Ma, you can use this formula for all of the lithosphere.)
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