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)
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
Related questions
Question
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?
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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