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To constrain a contribution of deep carbonated mantle, to fractionation of Hfrelative to rare earth elements (REE) in volcanic series, we examine availablehigh-quality data on major, trace element and Nd-Hf isotope compositions ofprimitive lavas and glasses erupted during preshield, postshield and mostlyrejuvenated stage of the Hawaiian hot spot (Pacific Ocean). Strong variationsof Hf/Sm, Zr/Sm, Ti/Eu, K/Th, Nb/Th, La/K and Ba/K in the lavas are notfeatures of the melt equilibration with residual amphibole or phlogopite, andcannot be due to variable degrees of batch or dynamic melting of uncarbonatedlherzolite source. Enrichment in REE, Th and Ba relative to K, Hf, Zr, Ti andNb together and low Si, high Na, K and Ca contents in the Hawaiian lavas arecompositional features of carbonated mantle lithospheric to asthenosphericperidotite source affected by carbonatite metasomatism. In contrast, major andtrace element signatures of most primitive preshield- and postshield-stagemagmas require pyroxenite source.  The available data infer that Salt Lake Crater garnet pyroxenite xenolithshosted by the Koolau volcano lavas on Oahu, Hawaii, were derived from deepeclogite source likely generating the carbonatite melts within the Hawaiianplume. Highly radiogenic Hf and decoupled Nd-Hf isotope systematics recorded inthe Salt Lake Crater mantle xenolith series on Oahu may be explained by strongHf fractionation relative to REE owing to ancient event of carbonatitemetasomatism, which is likely related to partial melting of the deeplysubducted carbonated eclogite within the Hawaiian plume.

Genesis of primitive Hawaiian rejuvenated-stage lavas: Evidence for carbonatite metasomatism and implications for ancient eclogite source