The role of subduction recycling on the selenium isotope signature of the mantle: Constraints from Mariana arc lavas

Kurzawa, Timon; König, Stephan; Alt, Jeffrey C; Yierpan, Aierken; Schoenberg, Ronny

doi:10.1016/j.chemgeo.2019.03.011

Cited by 18 publications

(6 citation statements)

References 52 publications

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“…All Se isotopic compositions obtained during this study are reported relative to the NIST-3149 Se reference solution (delta-zero-anchor). Measurements of the inter-laboratory standard solution MH-495 in four different analytical sessions over a period of more than 6 months yielded an average value of δ 82/76 Se of -3.23 ± 0.15 ‰ (2 SD, N = 23, 30 ng mL −1 solutions, Table S3), in agreement with previous studies (Kurzawa et al, 2017(Kurzawa et al, , 2019Labidi et al, 2018;Yierpan et al, 2018Yierpan et al, , 2019, and our long-term reproducibility in our lab over 5 years. International rock reference material USGS BCR-2 was repeatedly digested and analyzed during the course of this study, and gave δ 82/76 Se of 0.14 ± 0.15 ‰ (2 SD, N = 4) and Se concentration of 78 ng g ˗1 , respectively (Table S4, see also König et al, 2021).…”

supporting

confidence: 89%

Supplemental Material: Extreme fractionation of selenium isotopes and possible deep biospheric origin of platinum nuggets from Minas Gerais, Brazil

Cabral¹,

al.²

2021

Preprint

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supporting

confidence: 89%

Supplemental Material: Extreme fractionation of selenium isotopes and possible deep biospheric origin of platinum nuggets from Minas Gerais, Brazil

Cabral¹,

al.²

2021

Preprint

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“…2 ) 17 . This Se isotope variability among basaltic melts might reflect additional processes 26 , emphasizing that selected peridotites, with their range of ages, may indeed represent the most robust estimate of the BSE Se isotope signature.…”

Section: Se Isotope Signature Of the Bse Inferred From Peridotitesmentioning

confidence: 95%

Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System

et al. 2019

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The origin of Earth’s volatiles has been attributed to a late addition of meteoritic material after core-mantle differentiation. The nature and consequences of this 'late veneer' are debated, but may be traced by isotopes of the highly siderophile, or iron-loving, and volatile element selenium. Here we present high-precision selenium isotope data for mantle peridotites, from double spike and hydride generation multi-collector inductively coupled plasma mass spectrometry. These data indicate that the selenium isotopic composition of peridotites is unaffected by petrological processes, such as melt depletion and melt-rock reaction, and thus a narrow range is preserved that is representative of the silicate Earth. We show that selenium isotopes record a signature of late accretion after core formation and that this signature overlaps only with that of the CI-type carbonaceous chondrites. We conclude that these isotopic constraints indicate the late veneer originated from the outer Solar System and was of lower mass than previously estimated. Thus, we suggest a late and highly concentrated delivery of volatiles enabled Earth to become habitable.

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“…In other words, considering the big picture mass balance, slab dehydration may affect the mass fraction of Se without necessarily affecting its isotope signature. Preservation of the overall isotope signature of the slab, which is further subducted into the deeper mantle, is able to explain high δ 82/76 Se of plume-related lavas that trace recycled sedimentary components subducted from a redox stratified Proterozoic ocean (Yierpan et al, 2020), as well as low δ 82/76 Se of Mariana arc lavas that include recycled materials subducted from a fully oxygenated modern ocean (Kurzawa et al, 2019).…”

Section: Implications For the Se Subduction Cyclementioning

confidence: 99%

Selenium isotope evidence for pulsed flow of oxidative slab fluids

Koenig¹,

Rosca²,

Kurzawa³

et al. 2021

Geochem. Persp. Let.

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Isotope systematics of the redox sensitive and chalcophile element selenium (Se) were investigated on exhumed parts of subducted oceanic lithosphere to provide new constraints on slab dehydration conditions during subduction. The samples show increasing δ 82/76 Se NIST3149 with higher abundances of fluid mobile elements, comprising a larger range (−1.89 to þ0.48 ‰) than that of mantle (−0.13 ± 0.12 ‰) and altered ocean crust (−0.35 to −0.07 ‰). Our data point to pronounced, local scale redox variations within the subducting crust, wherein oxidative fluids dissolve sulfides and mobilise oxidised Se species. Subsequently recrystallising sulfides preferentially incorporate isotopically lighter, reduced Se, which shifts evolving fluids and late stage sulfides to higher δ 82/76 Se NIST3149. Redistribution of Se by repeated cycles of sulfide reworking within the subducted crust can be reconciled with episodes of oxidised fluid pulses from underlying slab mantle in modern subduction zones.

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The role of subduction recycling on the selenium isotope signature of the mantle: Constraints from Mariana arc lavas

Cited by 18 publications

References 52 publications

Supplemental Material: Extreme fractionation of selenium isotopes and possible deep biospheric origin of platinum nuggets from Minas Gerais, Brazil

Supplemental Material: Extreme fractionation of selenium isotopes and possible deep biospheric origin of platinum nuggets from Minas Gerais, Brazil

Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System

Selenium isotope evidence for pulsed flow of oxidative slab fluids

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