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What ages of basalt might be expected at points A and B on figure 11.3, assuming the rate of spreading to have been constant?

What ages of basalt might be expected at points A and B on figure 11.3, assuming the rate of spreading to have been constant?

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
Section: Chapter Questions
Problem 1LR
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What ages of basalt might be expected at points A and B on figure 11.3, assuming the rate of spreading to have been constant?

 

West East A sea level A' rift valley В Br Br Gilbert Gauss Matuyama Brunhes Brunhes Matuyama Gauss Gilbert 50 100 normal polarity reverse polarity kilometers FIGURE 11.3 A schematic cross section of the central part of the mid-Atlantic ridge showing topography and patterns of paleomagnetic data. The dark and light areas correspond to the pattern shown on figure I1.4. 4. Estimate the time necessary for the spread of TIME MAGNETIC the South Atlantic Ocean between Africa and IN POLARITY South America by dividing the present separa- tion along the trace of the red dashed line on fig- ure 11.2 by the rate of spreading as calculated in question 2. МYВР EVENTS 0.25 Brunhes -0.50 0.75 1.00 Jaramillo - 1.25 E1.50 1.75 Olduvai - 2.00 Reunion 5. What of basalt might be expected at points ages A and B on figure 11.3, assuming the rate of spreading to have been constant? E2.25 - 2.50 2.75 Mammoth 2A 3.00 - 3.25 -3.50 - 3.75 - 4.00 FIGURE 11.4 -4.25 3 Magnetic polarity scale for the last 5.5 million years of Earth history. Purple bands indicate periods of normal polarity. White band indicate times when magnetic 4.50 - 4.75 5.00 5.25 polarity was reversed compared to modern magnetic properties. | 159 normal reverse Depth in kilometers Gilbert 3.6- 5.41 my Gauss 2.6 – 3.6 Matuyama 0.78 - 2.6 my Brunhes 0.78
Transcribed Image Text:West East A sea level A' rift valley В Br Br Gilbert Gauss Matuyama Brunhes Brunhes Matuyama Gauss Gilbert 50 100 normal polarity reverse polarity kilometers FIGURE 11.3 A schematic cross section of the central part of the mid-Atlantic ridge showing topography and patterns of paleomagnetic data. The dark and light areas correspond to the pattern shown on figure I1.4. 4. Estimate the time necessary for the spread of TIME MAGNETIC the South Atlantic Ocean between Africa and IN POLARITY South America by dividing the present separa- tion along the trace of the red dashed line on fig- ure 11.2 by the rate of spreading as calculated in question 2. МYВР EVENTS 0.25 Brunhes -0.50 0.75 1.00 Jaramillo - 1.25 E1.50 1.75 Olduvai - 2.00 Reunion 5. What of basalt might be expected at points ages A and B on figure 11.3, assuming the rate of spreading to have been constant? E2.25 - 2.50 2.75 Mammoth 2A 3.00 - 3.25 -3.50 - 3.75 - 4.00 FIGURE 11.4 -4.25 3 Magnetic polarity scale for the last 5.5 million years of Earth history. Purple bands indicate periods of normal polarity. White band indicate times when magnetic 4.50 - 4.75 5.00 5.25 polarity was reversed compared to modern magnetic properties. | 159 normal reverse Depth in kilometers Gilbert 3.6- 5.41 my Gauss 2.6 – 3.6 Matuyama 0.78 - 2.6 my Brunhes 0.78
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