Deep Drilling Results in the Atlantic Ocean: Ocean Crust by Talani M

By Talani M

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Published via the yankee Geophysical Union as a part of the Maurice Ewing Series.

The moment Maurice Ewing Symposium used to be dedicated to the consequences of deep drilling ends up in the Atlantic Ocean. This topic used to be selected for 2 purposes. First, Maurice Ewing was once one of many leaders of JOIDES (Joint Oceanographic associations For Deep Earth Sampling), the organization of oceanographic associations that was once shaped to arrange and sponsor drilling within the deep ocean, and which has persisted to supply medical recommendation to the Deep Sea Drilling undertaking. moment, the 1st section of foreign software of Ocean Drilling within the Atlantic was once entire and it appeared a great time to evaluate the results of drilling ends up in the Atlantic that have been received over virtually a decade.

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Arrows show direction of motions of plates. Assuming east-west spreading, the pattern in the Famous Area is like that in (b) with three quarters of the fracture zone area appearing to be formed by ordinary spreading processes and thereafter deformed. Typical Crust Versus Fracture Zone Crust When we speak about a "typical" oceanic section we usually think of crust which was formed at a spreading center, faulted, and then carried away, pretty much undisturbed. In fact, a certain, not insignificant portion of the sea floor is either formed in fracture zones or highly deformed by them.

If g represents the distance of the fault generation position from the axis, Yl the observed distance from the axis to the first inward facing fault and ~y the mean fault spacing, then g = Y1 ~y (Flg. 12) · -:2 Table II shows observations of the width of the spacing of the inner walls (or first pair of major inward facing faults) for the different survey areas, and the calculated values of g, using the appropriate fault spacing. The wide variation of Y1 between segments of the same survey area, separated by fracture zones, reflects the relative ages of the first fault scarp.

More detailed profiles have been obtained by Deep Tow which is better able to resolve steep slopes. Macdonald and Luyendyk (1977) and Macdonald and Atwater (1978) concluded that outward facing faults were generated in the upper part of the median valley wall complex, and that beyond 20 km from the axis, they contributed as much to the relief of the crestal mountains as did the inward facing faults, thereby cancelling the shoaling depths of the median valley wall complex. They also concluded that tilting of blocks contributed less than 20% of the contribution by faulting.

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