Quantification of Nb, Ta, Ti and V anomalies in magmas associated with subduction zones: Petrogenetic implications

Details Quantification of Nb, Ta, Ti and V anomalies in magmas associated with subduction zones: Petrogenetic implications Quantification of Nb, Ta, Ti and V anomalies in magmas associated with subduction zones: Petrogenetic implications

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68..297b&link_type=abstract

Earth and Planetary Science Letters, Volume 68, Issue 2, p. 297-308.

Physics

50

Scientific paper

This study shows that hygromagmaphile elements (elements which exhibit an affinity for the liquid phase of magma: Th, Ta, Nb, Zr, Hf, Ti, Y, V) can be plotted on an extended rare earth diagram. The position of these elements among rare earths is determined and normalization values calculated from data on ocean tholeiites and alkali basalts. This representation in the form of an extended rare earth diagram permits a detection of the behavioral anomalies of certain elements (such as Eu anomalies). These anomalies can be quantified and used for petrogenetic interpretations. We demonstrate that Nb, Ta, Ti and V anomalies observed in magmas associated with subduction zones are not due to the same cause. Ti and V anomalies are interpreted as the result of opaque fractionation between the fractional crystallization of magmas; Nb and Ta anomalies are more primitive and are associated with the presence in the mantle of a phase which is stable under the P, T and H2O conditions generated by the geodynamic context.

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