Coupled molybdenum and niobium depletion in continental basalts

Details Coupled molybdenum and niobium depletion in continental basalts Coupled molybdenum and niobium depletion in continental basalts

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.136..715f&link_type=abstract

Earth and Planetary Science Letters, vol. 136, Issue 3-4, pp.715-721

Physics

5

Scientific paper

Molybdenum concentrations have been determined for a suite of Late Cenozoic basalt lavas from the Basin and Range province of the western United States. Lavas older than about 5 Ma, which are thought to have had a lithospheric mantle source, are strongly depleted in Nb and Mo relative to La and Nd, respectively. Lavas younger than 5 Ma, which are chemically and isotopically similar to ocean island basalt, show no such depletion in either Nb or Mo. A close geochemical coherence between Nb and Mo is consistent with their similar ionic radii (Nb 5+ , 0.64; Mo 4+ , 0.65). Both elements are probably retained in residual rutile in a dehydrating subducted slab, while the overlying lithospheric mantle is enriched in large-ion lithophile elements (including light REE), contained in silica-rich hydrous fluids expelled from the slab.

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