Trace element distribution coefficients in alkaline series

Details Trace element distribution coefficients in alkaline series Trace element distribution coefficients in alkaline series

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1071l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 5, pp.1071-1081

Computer Science

32

Scientific paper

Mineral/groundmass partition coefficients for U, Th, Zr, Hf, Ta, Rb, REE, Co and Sc have been systematically measured in olivine, clinopyroxene, amphibole, biotite, Ti-magnetites, titanite, zircon and feldspars, in basaltic to trachytic lavas from alkaline series (Velay, Chaîne des Puys: Massif Central, France and Fayal: Azores). Average partition coefficients are denned within the experimental uncertainty for limited compositional ranges (basalt-hawaiite, mugearites, benmoreite-trachyte), and are useful for trace element modelling. The new results for U, Th, Ta, Zr and Hf partition coefficients show contrasting behaviour. They can thus be used as "key elements" for identifying fractionating mineral phases in differentiation processes ( e.g. Ta and Th for amphibole and mica). Partition coefficient may be calculated using the two-lattice model suggested by (1985). Such values show a considerably reduced chemical dependence in natural systems, relative to weight per cent D values. The residual variations may be accounted for by temperature or volatile influence. This calculation greatly enhances modelling possibilities using trace elements for comparing differentiation series as well as for predicting the behaviour of elements during magmatic differentiation.

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