deeper layer contains 15-20% harzburgite and 80-85% lherzolite. garnet; trace elements; diamonds T estimates on eclogite xenoliths show that all were derived from the deeper layer. Xenolith data and garnet compositions indicate that the shallow layer is more magnesian ) than the deeper layer (Fo 91-92 ), and both layers are more olivine rich than South
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Griffin et al. (1999) studied this question.
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