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Sunda arc mantle so...
Sunda arc mantle source delta O-18 value revealed by intracrystal isotope analysis
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- Deegan, Frances (författare)
- Uppsala universitet,Naturresurser och hållbar utveckling
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- Whitehouse, Martin J. (författare)
- Swedish Museum Nat Hist, Dept Geosci, Stockholm, Sweden.
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- Troll, Valentin R. (författare)
- Uppsala universitet,Naturresurser och hållbar utveckling,Univ Padjajaran UNPAD, Fac Geol Engn, Bandung, Indonesia.
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- Geiger, Harri (författare)
- Uppsala universitet,Naturresurser och hållbar utveckling,Univ Freiburg, Inst Earth & Environm Sci, Freiburg, Germany.
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- Jeon, Heejin (författare)
- Swedish Museum Nat Hist, Dept Geosci, Stockholm, Sweden.
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- le Roux, Petrus (författare)
- Univ Cape Town, Dept Geol Sci, Cape Town, South Africa.
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- Harris, Chris (författare)
- Univ Cape Town, Dept Geol Sci, Cape Town, South Africa.
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- van Helden, Marcel (författare)
- Vrije Univ Amsterdam, Dept Earth Sci, Amsterdam, Netherlands.
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- Gonzalez-Maurel, Osvaldo (författare)
- Univ Cape Town, Dept Geol Sci, Cape Town, South Africa.
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(creator_code:org_t)
- 2021-06-24
- 2021
- Engelska.
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Ingår i: Nature Communications. - : Springer Nature. - 2041-1723. ; 12
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://www.nature.c...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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) delta O-18 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. 30km at Merapi to <= 20km at Agung. Here we show that mean clinopyroxene delta O-18 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 delta O-18 values of 5.7 (+/- 0.2 1SD) indistinguishable from the delta O-18 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. Subduction zone volcanoes are underlain by extensive magma plumbing systems, which can obscure original mantle source signals. Here, the authors show that intra-crystal oxygen isotope analysis of clinopyroxenes from the Sunda arc (Indonesia) reveal the delta 18 O value of the sub-arc mantle.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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