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The morphology, distribution and composition of solid and fluid inclusions in two mantle xenoliths from Dish Hill, California, were examined. Four types of inclusions are recognized that can be used to discriminate between actual mantle processes and processes acting upon a fragment of mantle as it is entrained and carried to the Earth's surface. Solid and fluid inclusions are important sites of incompatible-element concentrations in mantle xenoliths; leaching or failure of leaching of xenolith samples may pose an analytical dilemma in assigning specific chemical signatures to mantle processes. Through the use of thin-section maps of these xenoliths, it is demonstrated that zones in xenoliths with the least amount of post-entrainment contamination can be pinpointed and the problems resulting from random leaching can be minimized.-L.C.H.
Additional Publication Details
Solid and fluid inclusions in mantle xenoliths: an analytical dilemma?