Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

Deegan F.M., Whitehouse M.J., Troll V.R., Geiger H., Jeon H., le Roux P., Harris C., van Helden M., González-Maurel O.

Department of Earth Sciences, Natural Resources and Sustainable Development (NRHU), Uppsala University, Uppsala, Sweden; Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden; Faculty of Geological Engineering, Universitas Padjajaran (UNPAD), Bandung, Indonesia; Institute of Earth and Environmental Sciences, University of Freiburg, Freiburg, im Breisgau, Germany; Department of Geological Sciences, University of Cape Town, Cape Town, South Africa; Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands


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. © 2021, The Author(s).


Nature Communications

Publisher: Nature Research

Volume 12, Issue 1, Art No 3930, Page – , Page Count

Journal Link:

doi: 10.1038/s41467-021-24143-3

Issn: 20411723

Type: All Open Access, Gold, Green


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