The evolution of MORB and plume mantle volatile budgets: Constraints from fission Xe isotopes in Southwest Indian Ridge basalts

Parai, Rita; Mukhopadhyay, Sujoy

doi:10.1002/2014gc005566

Cited by 54 publications

(42 citation statements)

References 68 publications

(213 reference statements)

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“…Even if recycling of heavy noble gases (Ar, Kr, Xe) through subduction may occur (Holland and Ballentine, 2006;Kendrick et al, 2011;Parai and Mukhopadhyay, 2015), recycling of He and Ne into the OIB gas-rich source is not significant (Staudacher and Allègre, 1988;Holland and Ballentine, 2006). The 20 Ne/ 22 Ne ratio of 12.65 ± 0.04 is thus likely to represent the Fernandina source isotopic composition.…”

Section: Discussionmentioning

confidence: 99%

“…The air component may be derived from post-eruption contamination when samples are recovered from the seafloor (Ballentine and Barfod, 2000). It may also come from atmospheric recycling through subduction for heavy noble gases (Ar, Kr, Xe) (Holland and Ballentine, 2006;Kendrick et al, 2011;Parai and Mukhopadhyay, 2015). Noble gas studies often use step-crushing to analyse samples, and the results yield mixing trends between an atmospheric end-member and a mantle end-member.…”

Section: Introductionmentioning

confidence: 99%

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Solar wind implantation supplied light volatiles during the frst stage of Earth accretion

Péron¹,

Moreira²,

Putlitz³

et al. 2017

Geochem. Persp. Let.

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doi: 10.7185/geochemlet.1718The isotopic and elemental compositions of noble gases constitute a powerful tool to study volatile origin and evolution, due to their inertness, and can thus provide crucial information about the early stage of planetary formation. Two models are proposed to explain the light noble gas origin on Earth: the solar wind implantation model and the solar nebula gas dissolution model. However, noble gas measurements often show addition of air to the mantle-derived gas, which complicates the determination of mantle isotopic ratios. We analysed the noble gas isotopic compositions of single vesicles in samples from the Galápagos hotspot with laser ablation, in order to understand and remove this atmospheric component, as well as discriminate between the two scenarios. Based on the new high precision results and a new statistical approach, we show that the solar wind implantation model is more likely to explain the terrestrial He, Ne and Ar composition. This scenario could bring important constraints on the solar system environment during the early stage of planetary formation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solar wind implantation supplied light volatiles during the frst stage of Earth accretion

Péron¹,

Moreira²,

Putlitz³

et al. 2017

Geochem. Persp. Let.

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“…The parent isotopes, 129 I and 244 Pu, are short-life, so that they had decayed into the daughter species, 129 Xe(I) and 136 Xe(Pu), during the early Earth's evolution. Caracausi et al [2016] and Parai and Mukhopadhyay [2015] showed that this early generated ratio in MORB, 129 Xe(I)/ 136 Xe(Pu)≈ 8, is somewhat higher than in the plume rocks, ≈ 2. Figure 2.…”

Section: Nucleogenic Xenon Isotopes In the Mantlementioning

confidence: 94%

“…Precise measurements of the isotopic composition of Xe in mantle rocks and gases allowed 136 Xe(Pu) and 136 Xe(U) to be distinguished in samples of mantle plume and mid-ocean ridge basalts, but also in carbon dioxide gases [Ballentine and Holand, 2008;Caracausi et al, 2016;Parai and Mukhopadhyay, 2015]. The parent isotopes, 129 I and 244 Pu, are short-life, so that they had decayed into the daughter species, 129 Xe(I) and 136 Xe(Pu), during the early Earth's evolution.…”

Section: Nucleogenic Xenon Isotopes In the Mantlementioning

confidence: 99%

“…Parameters in (1) are: the initial concentration of 238 U DDP = 238 U BSE = 1.6 × 10 −10 mol g −1 [see Table 17.1 in Tolstikhin and Kramers, 2008]; the ratios of 129 Xe(I)/ 136 Xe(Pu) DDP = 2.1 (Figure 3b), 244 Pu/ 238 U DDP,0 = 0.007 [Hudson et al, 1989] The radiogenic Xe isotope ratios in mantle rocks and gases, calculated relative to isotope composition of the average carbonaceous chondrite xenon after Parai and Mukhopadhyay [2015] and Caracausi et al [2016]. These authors considered the different 129 Xe(I)/ 136 Xe(Pu) ratios in MORB-source and PLUMR-source materials as indication of different formation and evolution of the respective mantle reservoirs.…”

Section: Nucleogenic Xenon Isotopes In the Mantlementioning

confidence: 99%

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The late Earth's accretion: Processes and materials

Tolstikhin¹

2018

Russ. J. Earth Sci.

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In accord with the standard Earth accretion scenario, the late accretion supervened the last collision with a massive proto-planet, segregation of the core, and (partial) solidification of the magma ocean. These processes took place ≈ 40 Ma after Sun formation or somewhat later. Traces of the processes and respective materials have been preserved as specific elemental and isotopic abundances in the earth's mantle. Pu-238 U-129 I-Xe systematics trace the accreting materials and the rate of mantle mixing and degassing. Recently proposed interpretations of this last systematics appear to be precarious and are particularly discussed in this contribution. During the late accretion a terrestrial regolith, including chondritic and solar-wind-irradiated materials, was rapidly accumulating on the surface of the early thick basaltic crust, enriched in incompatible elements. This early crust had not been preserved. Its overturn(s) into the mantle during several 100th Ma after Sun formation and (partial) isolation from the mantle convection allow all principal observations, related to the informative systematics mentioned above, to be satisfied, providing the transfer of the crust®olith "cake" was not accompanying by fractionation and degassing, in contrast to present-day slab subduction.

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Origin of Light Noble Gases (He, Ne, and Ar) on Earth: A Review

Péron

Moreira

Agranier

2018

Geochem Geophys Geosyst

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We review the different scenarios for the origin of light noble gases (He, Ne, and Ar) on Earth. Several sources could have contributed to the Earth's noble gas budget: implanted solar wind, solar nebula gas, chondrites, and comets. Although there is evidence for “solar‐like” neon in the Earth's mantle, questions remain as to its origin. A new compilation of noble gas data in lunar soils, interplanetary dust particles, micrometeorites, and solar wind allows examination of the implanted solar wind composition, which is key to understanding the “solar‐like” mantle neon isotope composition. We show that lunar soils that reflect this solar‐wind‐implanted signature have a 20Ne/22Ne ratio very close to that of ocean island basalts. New data and calculations illustrate that the measured plume source 20Ne/22Ne ratio is close to the primitive mantle ratio, when taking into account mixing with the upper mantle (that has lower 20Ne/22Ne ratio). This favors early solar wind implantation to account for the origin of light volatiles (He, Ne, and possibly H) in the Earth's mantle: they were incorporated by solar wind irradiation into the Earth's precursor grains during the first few Myr of the solar system's formation. These grains must have partially survived accretion processes (only a few percent are needed to satisfy the Earth's budget of light volatiles). As for the atmosphere, the neon isotope composition can be explained by mixing 36% of mantle gases having this solar‐wind‐implanted signature and 64% of chondritic gases delivered in a late veneer phase.

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The evolution of MORB and plume mantle volatile budgets: Constraints from fission Xe isotopes in Southwest Indian Ridge basalts

Cited by 54 publications

References 68 publications

Solar wind implantation supplied light volatiles during the frst stage of Earth accretion

Solar wind implantation supplied light volatiles during the frst stage of Earth accretion

The late Earth's accretion: Processes and materials

Origin of Light Noble Gases (He, Ne, and Ar) on Earth: A Review

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