Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca Ridge? (refer to picture attached)
Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca Ridge? (refer to picture attached)
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
Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca Ridge? (refer to picture attached)
![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
Jaramillo
Cobs Mourtain to mid-ocean ridges (i.e. East Pacific Rise, Mid-Atlantic Ridge, etc.). Can you figure out how the paleomagnetic
1.0
data provides a way to calculate how fast the plates are moving away from the ridge axis?
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.]
Olduvai
Reunion
1. Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca
Ridge?
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?
Cochiti
Lavaca Ridge axis
4.0
Nunivak
SHOW YOUR WORK HERE!
Sidufjall
Thvera
5.0
Figure 1. Paleomagnetic
Time Scale, with periods of
Figure 2. Paleomagnetism across the Lavaca Ridge. Periods of normal
polarity are in black.
normal polarity in black.
O 10 20 30 40 50 60
luluduluduluhuludulahulad
Van Buren Ridge axis
Kilometers
SCALE
Figure 3. Paleomagnetism across the Van Buren Ridge. Periods of normal polarity are in black.
Radiometric Age (million years)
GILBERT
GAUSS
MATUYAMA
BRUNHES](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5312d9d6-6d91-4637-8159-7a26db52ed60%2Fcdec15e7-b79e-484a-9ab3-ef363e81b36a%2Fnie5g0c_processed.png&w=3840&q=75)
Transcribed Image Text: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
Jaramillo
Cobs Mourtain to mid-ocean ridges (i.e. East Pacific Rise, Mid-Atlantic Ridge, etc.). Can you figure out how the paleomagnetic
1.0
data provides a way to calculate how fast the plates are moving away from the ridge axis?
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.]
Olduvai
Reunion
1. Without doing any calculations, how can you tell that the Van Buren ridge is spreading faster than the Lavaca
Ridge?
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?
Cochiti
Lavaca Ridge axis
4.0
Nunivak
SHOW YOUR WORK HERE!
Sidufjall
Thvera
5.0
Figure 1. Paleomagnetic
Time Scale, with periods of
Figure 2. Paleomagnetism across the Lavaca Ridge. Periods of normal
polarity are in black.
normal polarity in black.
O 10 20 30 40 50 60
luluduluduluhuludulahulad
Van Buren Ridge axis
Kilometers
SCALE
Figure 3. Paleomagnetism across the Van Buren Ridge. Periods of normal polarity are in black.
Radiometric Age (million years)
GILBERT
GAUSS
MATUYAMA
BRUNHES
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