Constraints on source-forming processes of West Greenland kimberlites inferred from Hf Nd isotope systematics

Details Constraints on source-forming processes of West Greenland kimberlites inferred from Hf Nd isotope systematics Constraints on source-forming processes of West Greenland kimberlites inferred from Hf Nd isotope systematics

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.2820g&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 71, Issue 11, p. 2820-2836.

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Scientific paper

Kimberlites from West Greenland have Hf Nd isotope as well as major and trace element compositions that are similar to other Group I kimberlites, but that are distinctive in the spectrum of magmas sampled at Earth’s surface. The West Greenland kimberlites have ɛNdi that ranges from +1.6 to +3.1 and ɛHfi that ranges from -4.3 to +4.9. The samples exhibit ubiquitous negative ΔɛHfi (deviation from the ocean island basalt ɛHf ɛNd reference line), ranging from -1.8 to -11.2. The kimberlites are characterized by steep heavy rare earth element patterns, positive Ta Nb anomalies and negative Hf Zr anomalies. These chemical signals are consistent with the presence of ancient, subducted oceanic crust in the kimberlite source region. In the model we present, dewatering and possibly partial melting of rutile-bearing oceanic crust during subduction results in characteristic trace element patterns in the residual crust. During aging, the Hf Nd isotopic composition of this dewatered/partially melted EMORB-type crust evolves to negative ΔɛHfi values. Metasomatic fluids derived from this ancient subducted oceanic crust infiltrate and impart their trace element and isotopic signal on proximal peridotitic mantle. Melting of this metasomatized mantle peridotite results in kimberlite magmas.

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