dc.date.accessioned | 2024-03-10T18:04:41Z | |
dc.date.available | 2024-03-10T18:04:41Z | |
dc.date.created | 2024-01-04T11:00:02Z | |
dc.date.issued | 2023 | |
dc.identifier.citation | Messling, N. Jodder, Jaganmoy Hegner, E. Hofmann, A. Wemmer, K. Willbold, M. . Mobilization of Tungsten in Greenstone Belts of the Archean Kaapvaal and Singhbhum Cratons. Geochemistry Geophysics Geosystems. 2023, 24(12) | |
dc.identifier.uri | http://hdl.handle.net/10852/109409 | |
dc.description.abstract | Abstract Due to the inherently fluid‐mobile nature of W, the 182 W 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 182 W 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 182 W as low as −8.1 ± 4.3 ppm compared to the modern mantle. Covariations of μ 182 W 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 182 W 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. | |
dc.language | EN | |
dc.publisher | The Geochemical Society | |
dc.rights | Attribution-NonCommercial 4.0 International | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc/4.0/ | |
dc.title | Mobilization of Tungsten in Greenstone Belts of the Archean Kaapvaal and Singhbhum Cratons | |
dc.title.alternative | ENEngelskEnglishMobilization of Tungsten in Greenstone Belts of the Archean Kaapvaal and Singhbhum Cratons | |
dc.type | Journal article | |
dc.creator.author | Messling, N. | |
dc.creator.author | Jodder, Jaganmoy | |
dc.creator.author | Hegner, E. | |
dc.creator.author | Hofmann, A. | |
dc.creator.author | Wemmer, K. | |
dc.creator.author | Willbold, M. | |
cristin.unitcode | 185,15,22,91 | |
cristin.unitname | Senter for planetær beboelighet | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |
dc.identifier.cristin | 2220486 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geochemistry Geophysics Geosystems&rft.volume=24&rft.spage=&rft.date=2023 | |
dc.identifier.jtitle | Geochemistry Geophysics Geosystems | |
dc.identifier.volume | 24 | |
dc.identifier.issue | 12 | |
dc.identifier.pagecount | 20 | |
dc.identifier.doi | https://doi.org/10.1029/2023GC011161 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 1525-2027 | |
dc.type.version | PublishedVersion | |