Larry M. Heaman, Robert A. Creaser, Harrison O. Cookenboo; Extreme enrichment of high field strength elements in Jericho eclogite xenoliths: A cryptic record of Paleoproterozoic subduction, partial melting, and metasomatism beneath the Slave craton, Canada. Geology ; 30 (6): 507–510. doi: https://doi.org/10.1130/0091-7613(2002)030<0507:EEOHFS>2.0.CO;2
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An unusual suite of zircon- and rutile-bearing eclogite xenoliths from the 172 Ma Jericho kimberlite, Northwest Territories, Canada, displays a peculiar geochemistry highlighted by extreme enrichment of high field strength elements. Most profound are the large positive Nb and Zr anomalies that are linked to a high modal abundance of niobian rutile and zircon. This peculiar geochemistry, combined with results from U-Pb geochronology, requires a complex origin involving east-dipping Paleoproterozoic subduction and partial melting of oceanic crust beneath the Slave craton, one or more metasomatic overprints prior to kimberlite entrainment, and a Mesoproterozoic thermal disturbance in the Slave lithospheric mantle possibly linked to Mackenzie igneous events.