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Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

Author

Listed:
  • Frances M. Deegan

    (Uppsala University)

  • Martin J. Whitehouse

    (Swedish Museum of Natural History)

  • Valentin R. Troll

    (Uppsala University
    Universitas Padjajaran (UNPAD))

  • Harri Geiger

    (Uppsala University
    University of Freiburg)

  • 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)

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.

Suggested Citation

  • Frances M. Deegan & Martin J. Whitehouse & Valentin R. Troll & Harri Geiger & Heejin Jeon & Petrus le Roux & Chris Harris & Marcel Helden & Osvaldo González-Maurel, 2021. "Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24143-3
    DOI: 10.1038/s41467-021-24143-3
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