High temperature silicon isotope geochemistry

Savage, Paul S.; Armytage, R. M. G.; Georg, R. Bastian; Halliday, Alex N.

doi:10.1016/j.lithos.2014.01.003

Cited by 94 publications

(100 citation statements)

References 142 publications

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“…During this study we obtained a mean δ 30 Si of -0.24 ± 0.34‰ (2SD, n= 26) for BHVO-2 and -1.28 ± 0.26‰ (2SD, n= 17) for IRMM-017, respectively, which agrees well within uncertainties to previously published values (e.g. Reynolds et al, 2007;Savage et al, 2014;Chmeleff et al, 2008;Schuessler and von Blanckenburg, 2014). …”

Section: Tatzel Et Al (2015) Epsl -The Silicon Isotope Record Of Earsupporting

confidence: 90%

The silicon isotope record of early silica diagenesis

Tatzel

Blanckenburg

Oelze

et al. 2015

Earth and Planetary Science Letters

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Si. We suggest that the same processes redistributed stable silicon isotopes in precursor siliceous sediments of ancient chert. We infer that past environmental conditions can be reconstructed with high fidelity from the stable Si isotope composition of chert when initial seawater Si concentrations were high (such as in the Precambrian). Exchange of Si between layers during phase transformation (from opal-A to opal-CT and from opal-CT to quartz) is impeded when variable amounts of detrital minerals are present, because they control rates of silica phase transformation and hence the timing of dissolution-reprecipitation during burial.

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Section: Tatzel Et Al (2015) Epsl -The Silicon Isotope Record Of Earsupporting

confidence: 90%

The silicon isotope record of early silica diagenesis

Tatzel

Blanckenburg

Oelze

et al. 2015

Earth and Planetary Science Letters

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“…Standard data, the BHVO-2 basalt standard and the in-house Si single crystal standard were in good agreement with previously analysed data by Abraham et al (2008), the compilations by Savage et al (2014) and our own previously published data (Kempl, 2013). Table 3 shows that the δ 30 Si of the silicate phases in the new experiments ranges between -0.72 ± 0.05‰ (1 SD ) and 0.21 ± 0.16‰ (1 SD ).…”

Section: This Studysupporting

confidence: 89%

Silicon stable isotope fractionation between metal and silicate at high-pressure, high-temperature conditions as a tracer of planetary core formation

Kempl

Vroon

Wagt

et al. 2016

Netherlands Journal of Geosciences

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The largest differentiation event in Earth and other terrestrial planets was the high-pressure, high-temperature process of metal core segregation from a silicate mantle. The abundant element silicon (Si) can be partially sequestered into the metallic core during metal-silicate differentiation, depending on pressure, temperature and planetary oxidation state. Knowledge of the Si content of a planet's core can constrain the conditions of core formation, but in the absence of direct samples from planetary cores, quantifying core Si content is challenging. One relatively new tool to study core formation in terrestrial planets is based on combining measurements of the Si stable isotopic composition of planetary crust and mantle samples with measurements of the Si stable isotope fractionation between metal and silicate at high-temperature and high-pressure conditions. In this study we present the results of a small set of high-pressure, high-temperature (HPT) experiments and combine these with a review of literature data to investigate how the Si isotope fractionation behaviour between metal and silicate varies as a function specifically of experimental run time and temperature. We show that although there is no debate about the sign of fractionation, absolute values for Si isotope fractionation between metal and silicate are difficult to constrain because the experimental database remains incomplete, and because Si isotopic measurements of metals in particular suffer from the absence of a true inter-laboratory comparison. We conclude that in order to derive accurate quantitative estimates of the Si content of the core of the Earth or other planets a wide range of additional experiments will be required.

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“…This would lower the Si content required in Earth's core based on the Si isotopic offset between Earth's mantle and bulk Earth. This could reconcile the disparity between the Si content in Earth's core estimated from Si isotope analyses (∼5-10 wt%) ( 27) and recent experimental geophysics results (<4 wt%) (28,29).…”

mentioning

confidence: 66%

Silicon isotopes in angrites and volatile loss in planetesimals

Pringle

Moynier

Savage

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Inner solar system bodies, including the Earth, Moon, and asteroids, are depleted in volatile elements relative to chondrites. Hypotheses for this volatile element depletion include incomplete condensation from the solar nebula and volatile loss during energetic impacts. These processes are expected to each produce characteristic stable isotope signatures. However, processes of planetary differentiation may also modify the isotopic composition of geochemical reservoirs. Angrites are rare meteorites that crystallized only a few million years after calcium-aluminum-rich inclusions and exhibit extreme depletions in volatile elements relative to chondrites, making them ideal samples with which to study volatile element depletion in the early solar system. Here we present high-precision Si isotope data that show angrites are enriched in the heavy isotopes of Si relative to chondritic meteorites by 50-100 ppm/amu. Silicon is sufficiently volatile such that it may be isotopically fractionated during incomplete condensation or evaporative mass loss, but theoretical calculations and experimental results also predict isotope fractionation under specific conditions of metal-silicate differentiation. We show that the Si isotope composition of angrites cannot be explained by any plausible core formation scenario, but rather reflects isotope fractionation during impact-induced evaporation. Our results indicate planetesimals initially formed from volatile-rich material and were subsequently depleted in volatile elements during accretion.volatiles | accretion | isotopes | angrites | silicon

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High temperature silicon isotope geochemistry

Cited by 94 publications

References 142 publications

The silicon isotope record of early silica diagenesis

The silicon isotope record of early silica diagenesis

Silicon stable isotope fractionation between metal and silicate at high-pressure, high-temperature conditions as a tracer of planetary core formation

Silicon isotopes in angrites and volatile loss in planetesimals

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