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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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barry barry
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11 years ago
Discuss how oceanic crust forms. What process generates the necessary magma? Also, be sure to discuss ophiolite sequences and discuss how the formation of each layer contributes to the formation of the crust.
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11 years ago
Magma is generated through decompression melting. This magma rises to the surface to fill in the gaps between the diverging tectonic plates. Fractures created by tension provide pathways for magma to rise and spill out on to the ocean floor, creating the pillow basalts. The fractures the basalt moved through become sheeted dikes as the magma cools. Meanwhile, the magma that remained in the magma chamber formed the gabbro bodies.
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barry Authorbarry
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11 years ago
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