Using a modified Griggs apparatus with a claimed accuracy of ±50 MPa in differential stress, Jin et al. (2001) deformed hot-pressed quartz eclogite (50% garnet, 40% omphacite, and 10% quartz), garnet aggregate, and omphacite aggregate. They found that “the flow properties of eclogite are very similar to those of peridotite” (p. 667) and that “garnetite is only 2–3 times as strong as harzburgite” (p. 669). Based on these data, they suggest “delamination of oceanic crust from the underlying lithosphere due to contrasting rheologies is unlikely to occur during subduction either at shallow mantle depths or in the lower part of...

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