Silicon isotope variations in the inner solar system: Implications for planetary formation, differentiation and composition

Zambardi, Thomas; Poitrasson, Franck; Corgne, Alexandre; Méheut, Merlin; Quitté, G.; Anand, M.

doi:10.1016/j.gca.2013.06.040

Cited by 81 publications

(113 citation statements)

References 98 publications

(251 reference statements)

Supporting

Mentioning

101

Contrasting

Order By: Relevance

“…Similarly, it was recently argued that the Moon has heavy zinc isotopic composition relative to the Earth due to volatile loss associated with the Moon-forming impact [80], but these variations could also be explained by ZnCl 2 volatilization during basalt eruption as has been suggested for chlorine [75]. Silicon is one of the few elements for which the lunar and terrestrial isotopic compositions are well known, providing important constraints on scenarios of Moon formation [21][22][23].…”

Section: Nuclear Isotope Anomaliesmentioning

confidence: 96%

“…Silicon isotope measurements are reported using the δ 30 Si notation, which is the deviation in parts permil of the 30 Si/ 28 Si ratio of the sample relative to the composition of the standard NBS-28: δ 30 [21,23,61,[85][86][87][88]96,97]. From these published data, we estimate that the interlaboratory reproducibility of δ 30 Si measurements is approximately ±0.023 , which we take to represent the accuracy at which silicon isotope compositions can be measured at present.…”

Section: Nuclear Isotope Anomaliesmentioning

confidence: 99%

“…Silicon isotopes can be fractionated during magmatic differentiation [88] but seem to be unaffected by partial melting (the most mafic magmas have silicon isotopic composition identical to mantle peridotites), so the BSE value can be calculated by taking the average value of primary mantle magmas (defined here as magmatic igneous rocks with SiO 2 < 49 wt%, n = 20) and mantle peridotites (n = 33), which yields a δ 30 Si value of −0.297 ± 0.025 [23,61,[85][86][87][88]96]. With an average δ 30 Si value of −0.292 ± 0.026 (n = 38), lunar samples define a silicon isotopic composition for the Moon that is identical within uncertainties to that of the BSE [21,23,85] (figure 4). Chondrites have systematically lower δ 30 Si values than the BSE, ranging from −0.7 to −0.45 [23,61,85,86].…”

Section: Nuclear Isotope Anomaliesmentioning

confidence: 99%

“…With an average δ 30 Si value of −0.292 ± 0.026 (n = 38), lunar samples define a silicon isotopic composition for the Moon that is identical within uncertainties to that of the BSE [21,23,85] (figure 4). Chondrites have systematically lower δ 30 Si values than the BSE, ranging from −0.7 to −0.45 [23,61,85,86].…”

Section: Nuclear Isotope Anomaliesmentioning

confidence: 99%

“…The difference in silicon isotopic composition between the BSE and chondrites has been interpreted to reflect equilibrium stable isotopic fractionation between silicon in metal and silicate during core formation [23,85,86,94]. According to this picture, the bulk Earth would have a δ 30 Si value similar to ordinary or carbonaceous chondrites and the heavy silicon isotopic composition of the BSE relative to chondrites would be balanced by a reservoir with a light silicon isotopic composition in the core.…”

Section: Nuclear Isotope Anomaliesmentioning

confidence: 99%

See 4 more Smart Citations

Geochemical arguments for an Earth-like Moon-forming impactor

Dauphas

Burkhardt

Warren

et al. 2014

Phil. Trans. R. Soc. A.

122

101

View full text Add to dashboard Cite

Geochemical evidence suggests that the material accreted by the Earth did not change in nature during Earth's accretion, presumably because the inner protoplanetary disc had uniform isotopic composition similar to enstatite chondrites, aubrites and ungrouped achondrite NWA 5363/5400. Enstatite meteorites and the Earth were derived from the same nebular reservoir but diverged in their chemical evolutions, so no chondrite sample in meteorite collections is representative of the Earth's building blocks. The similarity in isotopic composition (Δ 17 O, ε 50 Ti and ε 54 Cr) between lunar and terrestrial rocks is explained by the fact that the Moon-forming impactor came from the same region of the disc as other Earth-forming embryos, and therefore was similar in isotopic composition to the Earth. The heavy δ 30 Si values of the silicate Earth and the Moon relative to known chondrites may be due to fractionation in the solar nebula/protoplanetary disc rather than partitioning of silicon in Earth's core. An inversion method is presented to calculate the Hf/W ratios and ε 182 W values of the proto-Earth and impactor mantles for a given Moon-forming impact scenario. The similarity in tungsten isotopic composition between lunar and terrestrial rocks is a coincidence that can be explained in a canonical giant impact scenario if an early formed embryo (two-stage model age of 10–20 Myr) collided with the proto-Earth formed over a more protracted accretion history (two-stage model age of 30–40 Myr).

show abstract

Section: Nuclear Isotope Anomaliesmentioning

confidence: 96%

Section: Nuclear Isotope Anomaliesmentioning

confidence: 99%

Section: Nuclear Isotope Anomaliesmentioning

confidence: 99%

Section: Nuclear Isotope Anomaliesmentioning

confidence: 99%

Section: Nuclear Isotope Anomaliesmentioning

confidence: 99%

See 3 more Smart Citations

Geochemical arguments for an Earth-like Moon-forming impactor

Dauphas

Burkhardt

Warren

et al. 2014

Phil. Trans. R. Soc. A.

122

101

View full text Add to dashboard Cite

show abstract

Coupled Si and O isotope measurements of meteoritic material by laser fluorination isotope ratio mass spectrometry

et al. 2019

View full text Add to dashboard Cite

We present a procedure for the determination of the isotopic ratios of silicon and oxygen from the same aliquot of anhydrous silicate material. The sample is placed in a bromine pentafluoride atmosphere as it is heated with a CO 2 laser system releasing silicon tetrafluoride and oxygen gasses. The oxygen gas is then purified to remove other reaction by-products through several liquid nitrogen traps before being captured onto a molecular sieve and transferred to an isotope ratio mass spectrometer.The silicon tetrafluoride gas is then purified using a supplementary line by repeatedly freezing to −196°C with liquid nitrogen and then thawing with an ethanol slurry at −110°C through a series of metal and Pyrex traps. The purified gas is then condensed into a Pyrex sample tube before it is transferred to an isotope ratio mass spectrometer for silicon isotope ratio measurements. This system has silicon yields of greater than 90% for pure quartz, olivine, and garnet standards and has a reproducibility of ±0.1‰ (2σ) for pure quartz for both oxygen and silicon isotope measurements. Meteoritic samples were also successfully analyzed to demonstrate this system's ability to measure the isotopic ratio composition of bulk powders with precision. This unique technique allows for the fluorination of planetary material without the need for wet chemistry. Though designed to analyze small aliquots of meteoritic material (1.5 to 3 mg), this approach can also be used to investigate refractory terrestrial samples where traditional fluorination is not suitable.

show abstract

High-Temperature Fe Isotope Geochemistry

Beard

Weyer

2020

Iron Geochemistry: An Isotopic Perspective

View full text Add to dashboard Cite

Silicon isotope variations in the inner solar system: Implications for planetary formation, differentiation and composition

Cited by 81 publications

References 98 publications

Geochemical arguments for an Earth-like Moon-forming impactor

Geochemical arguments for an Earth-like Moon-forming impactor

Coupled Si and O isotope measurements of meteoritic material by laser fluorination isotope ratio mass spectrometry

High-Temperature Fe Isotope Geochemistry

Contact Info

Product

Resources

About