Calculating Plate Speeds Using Seafloor Paleomagnetism Chron Subchron The paleomagnetic time scale (Fig. 1) illustrates the reversals of earth's magnetic polarity through time. The time scale was developed by examining the magnetic polarity of lava flows of various ages from thousands of locations on the continents. Many years later, and by accident, a similar pattern of magnetic reversals was discovered on the sea floor (Figs. 2 and 3). In each case, the pattern of reversals on the seafloor exhibits symmetry with respect to mid-ocean ridges (i.e. East Pacific Rise, Mid-Atlantic Ridge, etc.). Can you figure out how the paleomagnetic data provides a way to calculate how fast the plates are moving away from the ridge axis? 1.0 Jaramillo Cobb Mountain Definitions Half-spreading rate is the speed at which one plate is moving away from a mid-ocean ridge. Full-spreading rate = 2x half-spreading rate (This is the rate at which the ocean basin is getting wider.) OMai 2.0 Reunice 1. Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca Ridge? Karna Mammoth 3.0 2. Calculate and compare the a) half-spreading rates and b) full spreading rates for the Lavaca and Van Buren ridges. SHOW YOUR WORK! Do your calculated results confirm that the Van Buren ridge is spreading faster? Cochiti Lavaca Ridge axis 4.0 Nunivak SHOW YOUR WORK HERE! Sidufjall Thers 50 Figure 1. Paleomagnetic Time Scale, with periods of normal polarity in black. Figure 2. Paleomagnetism across the Lavaca Ridge. Periods of normal polarity are in black. 0 10 20 30 40 50 60 Van Buren Ridge axis Kilometers SCALE Figure 3. Paleomagnetism across the Van Buren Ridge. Periods of normal polarity are in black. Radiometric Age (million year) GILBERT GAUSS MATUYAMA BRUNHES
Calculating Plate Speeds Using Seafloor Paleomagnetism Chron Subchron The paleomagnetic time scale (Fig. 1) illustrates the reversals of earth's magnetic polarity through time. The time scale was developed by examining the magnetic polarity of lava flows of various ages from thousands of locations on the continents. Many years later, and by accident, a similar pattern of magnetic reversals was discovered on the sea floor (Figs. 2 and 3). In each case, the pattern of reversals on the seafloor exhibits symmetry with respect to mid-ocean ridges (i.e. East Pacific Rise, Mid-Atlantic Ridge, etc.). Can you figure out how the paleomagnetic data provides a way to calculate how fast the plates are moving away from the ridge axis? 1.0 Jaramillo Cobb Mountain Definitions Half-spreading rate is the speed at which one plate is moving away from a mid-ocean ridge. Full-spreading rate = 2x half-spreading rate (This is the rate at which the ocean basin is getting wider.) OMai 2.0 Reunice 1. Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca Ridge? Karna Mammoth 3.0 2. Calculate and compare the a) half-spreading rates and b) full spreading rates for the Lavaca and Van Buren ridges. SHOW YOUR WORK! Do your calculated results confirm that the Van Buren ridge is spreading faster? Cochiti Lavaca Ridge axis 4.0 Nunivak SHOW YOUR WORK HERE! Sidufjall Thers 50 Figure 1. Paleomagnetic Time Scale, with periods of normal polarity in black. Figure 2. Paleomagnetism across the Lavaca Ridge. Periods of normal polarity are in black. 0 10 20 30 40 50 60 Van Buren Ridge axis Kilometers SCALE Figure 3. Paleomagnetism across the Van Buren Ridge. Periods of normal polarity are in black. Radiometric Age (million year) GILBERT GAUSS MATUYAMA BRUNHES
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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I need help with question 2. Thank you. Sorry about the mess up.
![Calculating Plate Speeds Using Seafloor Paleomagnetism
Chron
Subchron
The paleomagnetic time scale (Flg. 1) illustrates the reversals of earth's magnetic polarity through time. The time
scale was developed by examining the magnetic polarity of lava flows of various ages from thousands of locations
on the continents. Many years later, and by accident, a slmilar pattern of magnetic reversals was discovered on
the sea floor (Flgs. 2 and 3). In each case, the pattern of reversals on the seafloor exhibits symmetry with respect
to mid-ocean ridges (I.e. East Pacific Rise, Mid-Atlantic Ridge, etc.). Can you figure out how the paleomagnetic
data provides a way to calculate how fast the plates are moving away from the rldge axis?
Jaramille
Cobb Mountain
Definitions
Half-spreading rate is the speed at which one plate is moving away from a mid-ocean ridge.
Full-spreading rate 2 x half-spreading rate [This is the rate at which the ocean basin is getting wider.]
Olduval
Reunion
1. Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca
Ridge?
30
Kaena
Mammoth
2. Calculate and compare the a) half-spreading rates and b) full spreading rates for the Lavaca and Van Buren
ridges. SHOW YOUR WORK! Do your calculated results confirm that the Van Buren ridge is spreading faster?
Cochti
Lavaca Ridge axis
4.0-
SHOW YOUR WORK HERE!
Nunis ak
soufjal
Threr
5.0
Figure 1. Paleomagnetic
Time Scale, with periods of
normal polarity in black.
Figure 2. Paleomagnetism across the Lavaca Ridge. Periods of normal
polarity are in black.
0 10 20 30 40 50 60
Van Buren Ridge axis
Kilometers
SCALE
Figure 3. Paleomagnetism across the Van Buren Ridge. Periods of normal polarity are in black.
Radiometric Ag (million year)
GILBERT
MATUYAMA
BRUNHES](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F692638d6-c475-40d1-9e74-a8dd07d88b0c%2F63118cc8-e354-45c3-8825-714b4329bfb9%2Fdhs8m7e_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Calculating Plate Speeds Using Seafloor Paleomagnetism
Chron
Subchron
The paleomagnetic time scale (Flg. 1) illustrates the reversals of earth's magnetic polarity through time. The time
scale was developed by examining the magnetic polarity of lava flows of various ages from thousands of locations
on the continents. Many years later, and by accident, a slmilar pattern of magnetic reversals was discovered on
the sea floor (Flgs. 2 and 3). In each case, the pattern of reversals on the seafloor exhibits symmetry with respect
to mid-ocean ridges (I.e. East Pacific Rise, Mid-Atlantic Ridge, etc.). Can you figure out how the paleomagnetic
data provides a way to calculate how fast the plates are moving away from the rldge axis?
Jaramille
Cobb Mountain
Definitions
Half-spreading rate is the speed at which one plate is moving away from a mid-ocean ridge.
Full-spreading rate 2 x half-spreading rate [This is the rate at which the ocean basin is getting wider.]
Olduval
Reunion
1. Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca
Ridge?
30
Kaena
Mammoth
2. Calculate and compare the a) half-spreading rates and b) full spreading rates for the Lavaca and Van Buren
ridges. SHOW YOUR WORK! Do your calculated results confirm that the Van Buren ridge is spreading faster?
Cochti
Lavaca Ridge axis
4.0-
SHOW YOUR WORK HERE!
Nunis ak
soufjal
Threr
5.0
Figure 1. Paleomagnetic
Time Scale, with periods of
normal polarity in black.
Figure 2. Paleomagnetism across the Lavaca Ridge. Periods of normal
polarity are in black.
0 10 20 30 40 50 60
Van Buren Ridge axis
Kilometers
SCALE
Figure 3. Paleomagnetism across the Van Buren Ridge. Periods of normal polarity are in black.
Radiometric Ag (million year)
GILBERT
MATUYAMA
BRUNHES
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