Earth’s geodynamic evolution constrained by 182W in Archean seawater

Mundl‐Petermeier, Andrea; Viehmann, Sebastian; Tusch, Jonas; Bau, Michael; Kurzweil, Florian; Münker, Carsten

doi:10.1038/s41467-022-30423-3

Cited by 9 publications

(6 citation statements)

References 44 publications

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“…Hence, they trace the source of components affecting local seawater composition (e.g., Viehmann et al, 2015). This is in marked contrast to the 182 W systematics in the Temagami BIF investigated by Mundl-Petermeier et al (2022), where positive μ 182 W anomalies were observed. While μ 182 W tracks metal-silicate partitioning and earlier differentiation events than μ 142 Nd, generally they should show similar trends.…”

Section: Introductionmentioning

confidence: 82%

“…The Temagami region has suffered only minor metamorphism (lower greenschist facies; Jolly, 1982) and hosts sedimentary deposits, including banded iron formations (BIF) that give internal Sm-Nd and Lu-Hf isochron ages of 2.7 Ga and for which the 143 Nd isotope compositions have been shown to derive from local Abitibi seawater (Viehmann et al, 2014). The banded iron formation at Temagami is a layered marine chemical sediment with alternating bands of Fe-rich magnetite and Si-rich metachert, showing evidence that both high temperature hydrothermal fluids and subaerial terrestrial weathering affected 2.7 Ga Temagami seawater chemistry (Bau and Alexander, 2009;Viehmann et al, 2014;Bau et al, 2022;Mundl-Petermeier et al, 2022). Previous work has shown that the Temagami BIF has unaltered rare earth element (Bau and Alexander, 2009; Supplementary Information), 143 Nd and 176 Hf isotope compositions (Viehmann et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Neoarchean marine chemical sediments as archives of Hadean silicate differentiation

Wainwright,

Debaille,

Hoffmann

et al. 2024

Geochem. Persp. Let.

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Planetary differentiation had a profound influence on the geochemical signature of the Earth's silicate reservoirs. Some of the early created complementary reservoirs dissipated with time (e.g., Bennett et al., 2007) and only remnants can be observed. Here, we apply the short lived isotopic system 146 Sm-142 Nd to an alternative archive -marine chemical sediments-and show that alternating Fe-and Si-rich bands from the 2.7 billion-year-old Temagami banded iron formation (BIF), Canada, display significantly different 142 Nd isotopic compositions. The Fe-rich bands yield a depleted signature (expressed as deviation from the standard in μ notation) with an average μ 142 Nd of þ7.02 ± 0.71, while the Si-rich bands display modern mantle-like signatures (average μ 142 Nd −2.83 ± 2.32) likely being the results of mixing between different sources. These complementary signatures reflect the dominant, locally derived source of Nd in the seawater at the time of deposition. Our results promote that layering in BIFs is a syn-depositional feature, and that BIFs are unique geochemical archives capable of recording silicate reservoirs that formed during the Hadean but were still extant during the Neoarchean.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Neoarchean marine chemical sediments as archives of Hadean silicate differentiation

Wainwright,

Debaille,

Hoffmann

et al. 2024

Geochem. Persp. Let.

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“…This is because the W budget of seawater is ultimately controlled by igneous rocks (Kurzweil et al, 2021) and positive μ 182 W anomalies are dominant in global Paleoarchean rock data (e.g., Puchtel et al, 2022;Tusch et al, 2021;Willbold et al, 2011). This assumption is confirmed by the isotopic composition of banded iron formations, which show positive μ 182 W values throughout the Archean (Mundl-Petermeier et al, 2022;Tusch et al, 2021). Fluid-rock interaction involving seawater can therefore not explain the negative μ 182 W values in the volcanic rocks of the Kaapvaal Craton.…”

Section: Origin Of W-rich Fluids In the Kaapvaal Cratonmentioning

confidence: 99%

Mobilization of Tungsten in Greenstone Belts of the Archean Kaapvaal and Singhbhum Cratons

Messling,

Jodder,

Hegner

et al. 2023

Geochem Geophys Geosyst

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Due to the inherently fluid‐mobile nature of W, the 182W record of the early Earth may have been obscured by fluid‐induced mobilization of W. To investigate W mobilization in Archean greenstone sequences, we analyzed 182W isotope systematics and major and trace element concentrations in samples from the 3.53 Ga old Onverwacht Group of the Kaapvaal Craton (South Africa) and the >3.51 Ga old Badampahar Group of the Singhbhum Craton (India). Our results for mafic and ultramafic metavolcanic rocks show W/Th ratios significantly higher than primary magmatic values, which suggests fluid‐induced W enrichment. Samples least affected by secondary W enrichment (W/Th < 0.26) show no resolvable W isotope anomalies from modern mantle values in both cratons. Samples from the Kaapvaal Craton with elevated W/Th exhibit deficits in 182W as low as −8.1 ± 4.3 ppm compared to the modern mantle. Covariations of μ182W with W/Th, and Ce/Pb suggest that negative isotope signatures were introduced during secondary fluid‐mediated processes. The enrichment of W is most evident in altered ultramafic rocks comprising serpentine, resulting in additional covariations between MgO, LOI, and W/Th. The W isotope composition of serpentinized komatiites reflects the composition of younger intruding granitoids. We therefore infer the latter as a possible source of W‐rich fluids. The Badampahar Group samples exhibit little W isotope variability. A well‐resolved 182W deficit of −6.2 ± 2.9 ppm was determined in a single komatiite sample, which indicates an unknown fluid source, currently not represented in any other unit of the Singhbhum Craton.

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“…2012, Mundl‐Petermeier et al . 2022). Initially, radiogenic 182 W isotope measurements were conducted by negative‐thermal ionisation mass spectrometry (N‐TIMS) for the meteorite samples (Harper et al .…”

mentioning

confidence: 99%

“…The short-lived 182 Hf-182 W system acts as one of the most effective tools in deciphering the origin of the early solar system, and the formation and evolution of planets (Kleine et al 2009, Mundl-Petermeier et al 2022. Initially, radiogenic 182 W isotope measurements were conducted by negative-thermal ionisation mass spectrometry (N-TIMS) for the meteorite samples (Harper et al 1991).…”

mentioning

confidence: 99%

A Novel Alkali Precipitation Method for Tungsten Separation and High‐Precision Isotopic Measurement in Geological Samples

Zheng

Wang

Zhou

et al. 2023

Geostandard Geoanalytic Res

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Tungsten (W) isotopes are useful tools in geological and cosmochemical research, but the chemical separation of W is cumbersome for high‐precision measurement. Here, a novel alkali (sodium hydroxide, NaOH) precipitation method for separation and purification of W in geological samples is described, which simplifies the chemical procedure. The amphoteric character of W is exploited to separate it from most matrix elements in alkaline conditions. Subsequently, TEVA resin was applied to further purify W for measurements using a multi‐collector inductively coupled plasma‐mass spectrometer. Importantly, the introduction of a certain amount of Na in the W analyte can increase the signal intensity by approximately 1.6 times, which may be caused by Coulomb fission. Such Na‐triggered signal enhancement reduces the test portion mass required for analysis. Our results show that the Alfa Aesar W standard solution and geological reference materials JB‐3, BCR‐2 and BHVO‐2 yield 182W/184W ratios consistent with previously reported values within uncertainty. Repeated measurement of the Alfa Aesar W standard solution shows that the intermediate precision of 182W/184W was better than 5 ppm (2s), which is sufficient to identify subtle 182W isotope variations in terrestrial and extra‐terrestrial samples. Above all, the alkali precipitation method in this study optimises the experimental process and mass spectrometric analysis.

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Earth’s geodynamic evolution constrained by 182W in Archean seawater

Cited by 9 publications

References 44 publications

Neoarchean marine chemical sediments as archives of Hadean silicate differentiation

Neoarchean marine chemical sediments as archives of Hadean silicate differentiation

Mobilization of Tungsten in Greenstone Belts of the Archean Kaapvaal and Singhbhum Cratons

A Novel Alkali Precipitation Method for Tungsten Separation and High‐Precision Isotopic Measurement in Geological Samples

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