Part C Iceland is unique along the Mid-Atlantic Ridge because it is the only par

Question

Part C Iceland is unique along the Mid-Atlantic Ridge because it is the only part of the ridge that is elevated above sea level. Why might this be the case? Select all that apply. View Available Hintfs) The new crust generated in Iceland is hot and therefore less dense. Compression from plate movement is thrusting part of the seafloor higher, elevating Iceland Iceland is receiving magma from decompression melting along the Mid-Atlantic Ridge. Iceland is receiving magma from a mantle plume Shear stress from offset segments of the divergent boundary are reorienting part of the seafloor making it taller Submit

Explanation / Answer

Ans:- option (A,C,D,E)

Please see the explanation:-

Iceland is very unique in case of magmatic activity because two of the major geological processes are recently happening under iceland. Iceland is the only place in the world where there is both M-O-R type volcanism in a sea floor spreading setting and hence a DECOMPRESSION type of melting and also a Plume related volcanism and hence a HOTSPOT related magmatism also. This plume may be originated from a depth of about 600-700 km depth or even at a depth of 2700 km at core mantle boundary. The plume is sub vertical, narrow column of HOT and BUOYANT and hence help the ridge to stand tall.  The broad iceland plate boundary also has segmented rift zone linked by transform fault zone and the rift propagation and transform fault migration away from the HOTSPOT helps in rearranging the plate boundary and deform and exhume the oceanic crust.

  Hence option A,C,D and E are correct answers.

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