Notice the black curve with triangular barbs just east of point C: a. If you cou

Question

Notice the black curve with triangular barbs just east of point C:

a. If you could take a submarine to view the sea floor along this line, what feature would you expect to see? (Hint see Fig 2.1A)

b. Based on Fig. 2.1, what lithospheric plate is located east of the black barbed line at point C?

c. Based on Fig. 2.1, what lithospheric plate is located west of the black barbed line at point C?

O 50 100 200 400 miles rankin 0-50100 Glacier voicanMount Meager 500 Kilpmet Mount Cayley : Mount Garibaldi CANA A-M. Baker· WASHINGTON MONTANA 0 Magnetic polarity time scale: ages are in millions of years ago (Mya) Glacier Mt. Rainier 2 Mountst Mt. Adams colors indicate rocks of normal magnetic polarity (+), like now The north-seeking end of a compass needle would have pointed in the general direction of the geographic Helens Mt. Hood Mt. Jefferson Three Sisters 4 Crest of Juan de Fuca Ridge 6 North Pole. Newberry olcano White areas have reversed magnetic polarity (). At those times, the north and south poles exchanged positions. The north-seeking end of a compass would have pointed in the Crater Lake OREGON 8 Mount Medicine Shasta Lake Volcano volcano Lassen Peak trench 11 general direction of CALIFORNIA the geographic South : Crest of. Gorda Ridge 2 Sea-floor spreading west spreading east

Explanation / Answer

A. If you could take a submarine to view the sea floor along this line, then the features which can be seen are given below:

There are two types of plates: continental and oceanic. Oceanic plates are made of mafic or basaltic rock. Continental plates are made of felsic or granitic rock. The main features of subduction zones include ocean trenches, volcanoes, and mountains. Other features include accretionary wedges, forearc basins, backarc basins and remnant arcs.

B. Based on Fig. 2.1, the lithospheric plate is located east of the black barbed line at point C is North American plate.

Based on Fig. 2.1, the lithospheric plate is located west of the black barbed line at point C is Juan de Fuca plate.

6. The Cascade Volcanoes were formed by the subduction of the Juan de Fuca, Explorer and the Gorda Plate (remnants of the much larger Farallon Plate) under the North American Plate along the Cascadia subduction zone.

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