The selenium isotopic variations in chondrites are mass-dependent; Implications for sulfide formation in the early solar system

Labidi, Jabrane; König, Stephan; Kurzawa, Timon; Yierpan, Aierken; Schoenberg, Ronny

doi:10.1016/j.epsl.2017.10.032

Cited by 27 publications

(28 citation statements)

References 68 publications

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“…of the mean obtained following replicate measurements; n= number of chondrite subtypes analysed; Fig. 2 ) 19 . The significantly lighter and homogeneous δ 82/76 Se value of enstatite chondrites (-0.40 ± 0.08‰, n=3) compared to that of the BSE discard these meteorites as the source of the Se isotopic signature of the BSE ( Fig.…”

Section: Implications For the Nature Of The Late Veneermentioning

confidence: 99%

“…2 ). Ordinary chondrites (-0.21 ± 0.10‰, n=9) and CO (-0.20 ± 0.07‰, n=2) and CV (-0.24 ± 0.10‰, n=2) carbonaceous chondrites can also be discarded as their mean δ 82/76 Se values are indistinguishable from each other 19 but are statistically significantly different than that of the BSE (Student’s t-test, two-tail P-value < 0.0001; Fig. 2 ).…”

Section: Implications For the Nature Of The Late Veneermentioning

confidence: 99%

“…Also shown are published data for the BSE 27 (2 s.d. analytical precision; average based on iron meteorites and igneous reference materials) and meteorites 19 . 2 s.d.…”

Section: Figurementioning

confidence: 99%

“…This Se-Te depleted mantle provides an ideal background for the late veneer to leave a diagnostic signature of these elements. In addition, a recent high-precision study reported distinguishable Se isotope compositions between different classes of chondrites 19 . Altogether, this shows that Se isotopes may potentially be a strong diagnostic tool to identify the type of chondrite representative of the late veneer composition that left its mark in the BSE, provided that such a BSE signature can be established.…”

mentioning

confidence: 98%

“…Altogether, this shows that Se isotopes may potentially be a strong diagnostic tool to identify the type of chondrite representative of the late veneer composition that left its mark in the BSE, provided that such a BSE signature can be established. However, a Se isotope composition of the BSE with similar high-precision to that of chondrites 19 is still missing. We here address this issue by investigating, for the first time, the Se isotope composition of mantle peridotites with a high-precision analytical technique.…”

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confidence: 99%

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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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Section: Implications For the Nature Of The Late Veneermentioning

confidence: 99%

Section: Implications For the Nature Of The Late Veneermentioning

confidence: 99%

“…Also shown are published data for the BSE 27 (2 s.d. analytical precision; average based on iron meteorites and igneous reference materials) and meteorites 19 . 2 s.d.…”

Section: Figurementioning

confidence: 99%

mentioning

confidence: 98%

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confidence: 99%

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

et al. 2019

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Chemical Sample Processing for Combined Selenium Isotope and Selenium‐Tellurium Elemental Investigation of the Earth's Igneous Reservoirs

Yierpan

König

Labidi

et al. 2018

Geochem Geophys Geosyst

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The redox‐sensitive, chalcophile, and volatile Se stable isotope system offers new perspectives to investigate the origin and evolution of terrestrial volatiles and the roles of magmatic and recycling processes in the development of the redox contrast between Earth's reservoirs. Selenium isotope systematics become more robust in a well‐constrained petrogenetic context as can be inferred from Se‐Te elemental signatures of sulfides and igneous rocks. In this study, we present a high‐yield chemical sample processing method that allows the determination of Se‐Te concentrations and Se isotope composition from the same sample digest of silicate rocks by hydride generation isotope dilution (ID) quadrupole inductively coupled plasma mass spectrometry (ICP‐MS) and double spike (DS) multicollector (MC)‐ICP‐MS, respectively. Our procedure yields ∼80% Se‐Te recoveries with quantitative separation of relevant interfering elements such as Ge and HG‐buffering metals. Replicate analyses of selected international reference materials yield uncertainties better than 0.11‰ (2 s.d.) on δ82/76Se and 3% (r.s.d.) on Se concentration for DS MC‐ICP‐MS determinations for as low as ∼10 ng sample Se. The precision of Se‐Te concentration measurements by ID ICP‐MS is better than 3% and 5% (r.s.d.) for total amounts of ∼0.5–1 ng Se and ∼0.2–0.5 ng Te, respectively. The basaltic reference materials have variable Se‐Te contents, but their δ82/76Se values are rather uniform (on average 0.23 ± 0.14‰; 2 s.d.) and different from the chondritic value. This altogether provides the methodology and potential to extend the limited data set of coupled Se isotope and Se‐Te elemental systematics of samples relevant to study the terrestrial igneous inventory.

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

et al. 2019

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The selenium isotopic variations in chondrites are mass-dependent; Implications for sulfide formation in the early solar system

Cited by 27 publications

References 68 publications

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

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

Chemical Sample Processing for Combined Selenium Isotope and Selenium‐Tellurium Elemental Investigation of the Earth's Igneous Reservoirs

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

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