Potassium, strontium, uranium and other incompatible elements are notably absent in these features' namesake basalts.
Devals are hypothesized to be caused by discontinuities in magma chambers near these entities. Potassium, strontium, uranium and other incompatible elements are notably absent in these features' namesake basalts. Black smokers occur mainly at these locations. Basaltic magmas extruded here form pillow lavas. Striping that was discovered parallel to one of these locations showed evidence of (*) magnetic reversals. Along with slab pull, forces generated at these locations are hypothesized to drive tectonic plate motion.These systems, which are also known as spreading centers, are broken by transform faults known as fracture zones. For 10 points, name this type of underwater mountain range which surrounds divergent plate boundaries, examples of which include the East Pacific Rise and one in the center of the Atlantic.
Devals are hypothesized to be caused by discontinuities in magma chambers near these entities.
Mid-Ocean ridges