Sunda arc mantle source [Delta-O-18] value revealed by intracrystal isotope analysis
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
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Anmerkungen
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Nature communications. - 12 (2021) , 3930, ISSN: 2041-1723
- Schlagwort
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Geowissenschaften
Geochemie
Vulkanismus
- Ereignis
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Veröffentlichung
- (wo)
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Freiburg
- (wer)
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Universität
- (wann)
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2022
- Urheber
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Deegan, Frances M.
Whitehouse, Martin J.
Troll, Valentin R.
Geiger, Harri
Jeon, Heejin
Roux, Petrus le
Harris, Chris
Helden, Marcel van
González-Maurel, Osvaldo
- Beteiligte Personen und Organisationen
- DOI
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10.1038/s41467-021-24143-3
- URN
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urn:nbn:de:bsz:25-freidok-2258290
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:37 MESZ
Datenpartner
Deutsche Nationalbibliothek. Bei Fragen zum Objekt wenden Sie sich bitte an den Datenpartner.
Beteiligte
- Deegan, Frances M.
- Whitehouse, Martin J.
- Troll, Valentin R.
- Geiger, Harri
- Jeon, Heejin
- Roux, Petrus le
- Harris, Chris
- Helden, Marcel van
- González-Maurel, Osvaldo
- Albert-Ludwigs-Universität Freiburg. Professur für Mineralogie und Petrologie
- Universität
Entstanden
- 2022
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