Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

Frances M. Deegan (), Martin J. Whitehouse, Valentin R. Troll, Harri Geiger, Heejin Jeon, Petrus le Roux, Chris Harris, Marcel Helden and Osvaldo González-Maurel
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Frances M. Deegan: Uppsala University
Martin J. Whitehouse: Swedish Museum of Natural History
Valentin R. Troll: Uppsala University
Harri Geiger: Uppsala University
Heejin Jeon: Swedish Museum of Natural History
Petrus le Roux: University of Cape Town
Chris Harris: University of Cape Town
Marcel Helden: Vrije Universiteit Amsterdam
Osvaldo González-Maurel: University of Cape Town

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Magma plumbing systems underlying subduction zone volcanoes extend from the mantle through the overlying crust and facilitate protracted fractional crystallisation, assimilation, and mixing, which frequently obscures a clear view of mantle source compositions. In order to see through this crustal noise, we present intracrystal Secondary Ion Mass Spectrometry (SIMS) δ18O values in clinopyroxene from Merapi, Kelut, Batur, and Agung volcanoes in the Sunda arc, Indonesia, under which the thickness of the crust decreases from ca. 30 km at Merapi to ≤20 km at Agung. Here we show that mean clinopyroxene δ18O values decrease concomitantly with crustal thickness and that lavas from Agung possess mantle-like He-Sr-Nd-Pb isotope ratios and clinopyroxene mean equilibrium melt δ18O values of 5.7 ‰ (±0.2 1 SD) indistinguishable from the δ18O range for Mid Ocean Ridge Basalt (MORB). The oxygen isotope composition of the mantle underlying the East Sunda Arc is therefore largely unaffected by subduction-driven metasomatism and may thus represent a sediment-poor arc end-member.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24143-3

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DOI: 10.1038/s41467-021-24143-3

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