Fractionation of Nb and Ta by biotite and phengite: Implications for the "missing Nb paradox"
The subchondritic Nb/Ta in both the continental crust and the depleted mantle remains enigmatic and is called the "missing Nb paradox." We present partitioning data between biotite and granitic melt for experimental and natural samples that provide evidence that Nb is compatible in biotite and phengite. Nb can thus be enriched in the residue during partial melting of crustal rocks. Additionally, biotite and phengite in equilibrium with granitic melts preferentially incorporate Nb over Ta....[Show more]
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