Samples tak ated pal shows th en from the seamounts along the ridge were dated r

Question

Samples tak ated pal shows th en from the seamounts along the ridge were dated radiometrically, and some were eontologically by the age of the oldest fossiliferous sediments covering them. Figure 3 e ages of the seamounts plotted against distance from Kilauea on the island of Hawai. 80 Ages of volcanoes along the Hawaiian- Emperor volcanic ridge (in millions of ears) plotted against distance from Kilauea. Ages are given for selected volcanoes. Meli Seamount Figures in parentheses: (km from Kilauea/milions of years) 60 50 (3,52043.4) 40 (2432/27.7 30 20 10 (51S.1) 1,000 2,000 4,000 6,000 6,000 Distance from Kilauea in klometers From Figure 2, note the change in direction of the ridge at the Hawaiian-Emperor bend. When did it take place? 4. 5. Before the bend took place, what was the direction of plate movement? Since the bend took place, what has been the direction of movement? 7. From Figure 3, what is the rate of movement in centimeters per year? Show your calculations. Does that make sense given what we know about typical plate rates of motion? 7.

Explanation / Answer

rAs we have only figure 3 therefore, only question 7 can be attempted.

7 Distance between Kaual and Midway is = 2,432-519 = 1,913 km = 1,913 x 1000 x 100 (1 kilometre have 1000 meters and 1 meter have 100 centimetres) = 191,300,000 centimetres

Difference in time between Kaual and Midway in million of years = 27.7-5.1= 22.6 million of years = 22,600,000 years

Rate of movement = (191,300,000/22,600,000) = 8.46 centimetres per year

As far as the rate is concerned this is a bit more than normal, normally we have a movement of 4-5 centimetres per year.

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