Some of the pioneering work on the implications of seafloor magnetic anomalies w

Question

Some of the pioneering work on the implications of seafloor magnetic anomalies was conducted by Frederick Vine in the mid-20th century (Vine and Matthews, 1963; Vine, 2001). Some of his work focused on the western margin of the United States. The figure below shows the interpreted magnetic anomaly map off of the west coast of the USA.

http://en.wikipedia.org/wiki/Magnetic_anomaly#mediaviewer/File:Magnetic_anomalies_off_west_coast_of_North_America.gif

a. What are the two plates covered by the magnetic anomaly map? Are they oceanic or continental plates?

b. What is the age of the age of the oldest oceanic crust of the two plates?

c. Are these the maximum ages of these two plates? Explain your answer. Hint: the reason is not the same for the two plates.

d. What happened to the crustal material of the Juan de Fuca plate that was greater than 10 million years old?

Explanation / Answer

A) Earth

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