Determination of silicon isotope ratios in silicate materials by high-resolution MC-ICP-MS using a sodium hydroxide sample digestion method

Boorn, Sander H. J. M. van den; Vroon, P.Z.; Belle, Coos C. van; Wagt, Bas van der; Schwieters, Johannes; Bergen, Manfred J. van

doi:10.1039/b600933f

Cited by 75 publications

(82 citation statements)

References 36 publications

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“…Basile-Doelsch et al, 2005;Robert and Chaussidon, 2006) is still 3 times less precise than MC-ICPMS. Several recent studies have reported high-precision MC-ICPMS Si isotope measurements of cherts, primarily from Archean successions (Andre et al, 2006;van den Boorn et al, 2007van den Boorn et al, , 2010Steinhoefel et al, 2009Steinhoefel et al, , 2010Abraham et al, 2011). Here we report high-precision MC-ICPMS Si isotope data for a suite of well-characterized chert samples with ages ranging from $2530 to $750 Ma.…”

Section: Introductionmentioning

confidence: 98%

“…However, it is clear from the sedimentary geology and petrography that these materials vary in mode of formation and environmental setting, raising the question of whether long term trends might principally reflect the succession in sample dominance from hydrothermal cherts in the Early Archean, to iron formation in late Archean and Paleoproterozoic basins, to pertidal cherts in younger Proterozoic basins (e.g. Fischer and Knoll, 2009;van den Boorn et al, 2010). Added to this is the potentially complicating issue that isotope fractionation accompanies silica adsorption onto iron oxides, with the lighter isotope preferentially enriched in the precipitate Opfergelt et al, 2009).…”

Section: Samplesmentioning

confidence: 99%

“…They interpreted their combined O and Si isotope data from Precambrian cherts to reflect seawater paleo-temperatures. Subsequent studies have highlighted the importance of the source of Si in determining the isotopic composition of preserved cherts (van den Boorn et al, 2007(van den Boorn et al, , 2010Steinhoefel et al, 2009;Heck et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Si isotope variability in Proterozoic cherts

Chakrabarti

Knoll

Jacobsen

et al. 2012

Geochimica et Cosmochimica Acta

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We report Si-isotopic compositions of 75 sedimentologically and petrographically characterized chert samples with ages ranging from $2600 to 750 Ma using multi-collector inductively coupled plasma mass spectrometry. d 30 Si values of the cherts analyzed in this study show a $7& range, from À4.29 to +2.85. This variability can be explained in part by (1) simple mixing of silica derived from continental (higher d 30 Si) and hydrothermal (lower d 30 Si) sources, (2) multiple mechanisms of silica precipitation and (3) Rayleigh-type fractionations within pore waters of individual basins.We observe $3& variation in peritidal cherts from a single Neoproterozoic sedimentary basin (Spitsbergen). This variation can be explained by Rayleigh-type fractionation during precipitation from silica-saturated porewaters. In some samples, postdissolution and reprecipitation of silica could have added to this effect. Our data also indicate that peritidal cherts are enriched in the heavier isotopes of Si whereas basinal cherts associated with banded iron formations (BIF) show lower d 30 Si. This difference could partly be due to Si being derived from hydrothermal sources in BIFs. We postulate that the difference in d 30 Si between non-BIF and BIF cherts is consistent with the contrasting genesis of these deposits. Low d 30 Si in BIF is consistent with laboratory experiments showing that silica adsorbed onto Fe-hydroxide particles preferentially incorporates lighter Si isotopes.Despite large intrabasinal variation and environmental differences, the data show a clear pattern of secular variation. Low d 30 Si in Archean cherts is consistent with a dominantly hydrothermal source of silica to the oceans at that time. The monotonically increasing d 30 Si from 3.8 to 1.5 Ga appears to reflect a general increase in continental versus hydrothermal sources of Si in seawater, as well as the preferential removal of lighter Si isotopes during silica precipitation in iron-associated cherts from silica-saturated seawater. The highest d 30 Si values are observed in 1.5 Ga peritidal cherts; in part, these enriched values could reflect increasing sequestration of light silica during soil-forming processes, thus, delivering relatively heavy dissolved silica to the oceans from continental sources. The causes behind the reversal in trend towards lower d 30 Si in cherts younger than 1.5 Ga old are less clear. Cherts deposited 1800-1900 Ma are especially low d 30 Si, a possible indication of transiently strong hydrothermal input at this time.

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Section: Introductionmentioning

confidence: 98%

Section: Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Si isotope variability in Proterozoic cherts

Chakrabarti

Knoll

Jacobsen

et al. 2012

Geochimica et Cosmochimica Acta

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“…The sample introduction system consisted of a Cetac Aridus I desolvating system containing an elemental Scientific PFA microcentric Aspire nebuliser system (dry plasma mode). A mass resolution of about R Power = 4300 in high-resolution mode and of R Power = 2500 in medium resolution mode were sufficient (Van den Boorn et al, 2006) to resolve all Si isotopes from common polyatomic interferences. Secondary Si isotope standards included the Hawaiian basalt BHVO-2 and an in-house calibrated Si single crystal (Kempl, 2013).…”

Section: Fig 8 a Schematic Of Beam Splitting In A Multi-collector mentioning

confidence: 99%

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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“…Through the use of standard-sample-standard bracketing, reliable δ 30 Si measurements can be obtained with analytical errors under conventional MC-ICP-MS that are either equivalent to or lower than those achieved with IRMS (Cardinal et al, 2003). Further advances in recent years have been made by using an alkaline fusion rather than HF dissolution stage to increase the sensitivity and reduce silicon fractionation during sample introduction van den Boorn et al, 2006). Reynolds et al, 2006a,b).…”

Section: Silicon Isotopesmentioning

confidence: 99%