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Garnet peridotite xenoliths from the Sloan kimberlite (Colorado) are variably depleted in their major magmaphile (Ca, Al) element compositions with whole rock Re-depletion model ages generally consistent with this depletion occurring in the mid-Proterozoic. Unlike many lithospheric peridotites, the Sloan samples are also depleted in incompatible trace elements, as shown by the composition of separated...
Chemically primitive late Cenozoic tholeiitic basalts from the northwestern U.S.A. have Os-isotopic compositions more radiogenic than observed for most basalts from the ocean basins. This result is inconsistent with the simple petrogenetic model that explains the geographically correlated Sr-, Nd- and Pb-isotopic variation in these basalts as resulting solety from melting of metasomatized lithospheric...
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