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Abstract

We report here the compositions of primitive high-Mg adakite lavas from the Kadavu Island Group, Fiji. Two distinctive high-Mg adakite compositions are present on Kadavu, and both are strongly enriched in Sr and La, with high Sr/Y (>120) and La/Yb (>30) values. The east Kadavu high-Mg adakite is relatively enriched in K2O and depleted in TiO2 and Nb. Our results from Kadavu suggest that there is an adakite magma series that is the result of complex
open-system magmatic processes, including magma mixing between relatively low SiO2 mantle-derived melts of high-Mg adakite composition and high SiO2, low-Mg adakite magma.
The results from Kadavu Island suggest that adakite magma suites worldwide are likely to include primitive high-Mg compositions, despite the lack of fi eld evidence in many cases.

Item Type:	Article
Authors/Creators:	Danyushevsky, LV and Falloon, TJ and Crawford, AJ and Tetroeva, SA and Leslie, RL and Verbeeten, A
Keywords:	adakite, olivine, melt inclusions, Kadavu, Fiji, slab melting, hot subduction.
Journal or Publication Title:	Geology
DOI / ID Number:	https://doi.org/10.1130/G24349A.1
Additional Information:	© 2008 Geological Society of America.
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