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Paper Topic:

Deep Sea Drilling Pro of the Atlantic Ocean

GEOL114 : Introduction to Oceanography

Module 3 : Water . Atmospheric Circulation

Project 1 : Bathymetry , Sediments , and Plate Tectonics

Table 1 . Completed data , with calculated values

A B C D E F G H

Site Longitude

West (degrees ) Age (million years ) Water

Depth (m ) Sediment

Thickness (m ) Depth to

Crust (m ) Distance from Ridge (degrees ) Distance Ridge (km

14 20 .9 38 -4250 -550 -4800 8 .9 988 .888889

15 18 21 -3750 -360 -4110 6 666 .666667

16 15 .7 9 -3400 -180 -3580 3 .7 411 .111111

17

6 .6 33 -4200 -530 -4730 5 .4 600

18 8 20 -3850 -390 -4240 4 444 .444444

19 23 .7 49 -4550 -944 -5494 11 .7 1300

20 26 .7 67 -4425 -1000 -5425 14 .7 1633 .33333 Plotting and interpreting depth to the ocean crust versus longitude

Figure 1 below shows the plot of the computed depth to crust (meters versus longitude (degrees

Figure 1 . Depth versus longitude

It should be noted that the Mid-Atlantic Ridge is like a mountain under the ocean , and thus it is expected to be shallower the cross section must therefore look like a mountain with the peak at the location of the ridge (Redfern ,

.26 . From the plot in Figure 1 , it can be interpolated that the region corresponding to the ridge falls in approximately 12 degrees longitude . This region is marked by a red broken line on the graph

To calculate the distance from the mid-ocean ridge (column H of Table 1 , the longitude values in column B were subtracted by 12 degrees Negative differences are regions that are to the east and positive results are to the west of the ridge . The absolute values are presented in column G , where items in red denote locations east of the ridge and items in blue , to the west

To solve for the values in column H , we need to use the conversion factor provided . If the distance from the North Pole to the equator is 10 ,000 km corresponding to 90 degrees latitude , then each degree latitude is equivalent to 111 .11 km . Moreover , at the equator 1 degree latitude equals 1 degree longitude . Therefore , each value in column G should be multiplied to a conversion factor of 111 .km /degree , or 10 ,000 km /90 degrees . This would cancel the unit of degree and leave us with a value expressed in kilometers

Plotting the Different Relationships

Age of sediment versus distance from the ridge

Figure 2 . Age of sediment versus distance from the ridge

What is the relation of age versus distance

It follows an almost linear trend with positive slope . This means that the farther you get from the ridge , the older the sediments are

Why does this relation occur

This is expected because the ridge is the boundary between two oceanic plates . Within this region , new material from the mantle is released in the form of magma . It is therefore expected that the material near the ridge is younger . Moreover , this...

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