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Currently, there are several sources of information about the material composition of the upper mantle of the Earth. The characteristic assemblage of rocks which form at spreading ridges is called an ophiolite sequence. Ophiolite Belts of the Earth are the sections of the Earth's oceanic crust and the underlying upper mantle that has been uplifted or emplaced to be exposed within continental crustal rocks. Some aspects of the use an Ophiolite to study the composition of the upper mantle of the Earth are considered below.
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