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High-Mg adakites from Kadavu Island Group, Fiji, southwest Pacific: Evidence for the mantle origin of adakite parental melts

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posted on 2023-06-23, 11:06 authored by LV Danyushevsky, Trevor FalloonTrevor Falloon, Anthony CrawfordAnthony Crawford, S Tetroeva, RAJ Leslie, AC Verbeeten
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 magrna suites worldwide are likely to include primitive high-Mg compositions, despite the lack of field evidence in many cases. © 2008 The Geological Society of America.

History

Publication title

Geology

Volume

36

Issue

6

Article number

6

Number

6

Pagination

499-502

Department/School

Earth Sciences, CODES ARC

Publisher

Geological Soc Amer, Inc

Publication status

  • Published

Rights statement

Copyright 2008 Geological Society of America.

Repository Status

  • Open

Socio-economic Objectives

280107 Expanding knowledge in the earth sciences