Cited by 86Geochemistry and Elemental AnalysisPaleontology and Stratigraphy of FossilsGeological and Geochemical Analysis

Sources of rare-earth elements and iron in Paleoproterozoic iron-formations from the Transvaal Supergroup, South Africa: evidence from neodymium isotopes

Bau, Michael, Höhndorf, Axel, Dulski, Peter, Beukes, Nicolas J.·1997·The Journal of Geology

Abstract

Neodymium isotopic data are reported for pure chemical sediments from the Siderian Kuruman and Penge Iron-Formations (IFs) in the Transvaal Supergroup, South Africa. From a large sample set for which petrographical and chemical data was available, we selected samples which best represent the pure chemical sediment and still carry the primary rare-earth element (REE) distribution for isotope analyses. Both the Kuruman IF ( + 1.9 and +1.1) and the Penge IF (+ 0.2 and -0.2) show $$\epsilon_{Nd} (2.5 Ga)$$ values more radiogenic than published values for epiclastic sediments from the slightly older Black Reef Formation (-5.1 to -3.2). This suggests that REE and iron in the Transvaal IFs were predominantly, though not exclusively, derived from hydrothermal alteration of oceanic crust. The $$\epsilon_{Nd} (2.5 Ga)$$ value of the Kuruman IF is similar to that proposed for the Hamersley IF in western Australia, suggesting that $$\epsilon_{Nd}(t) values of + 1 \pm 1$$ were typical of IF-depositing open ocean waters at the Archean/Proterozoic boundary.

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Crossref · 10.1086/606152

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21 of 21 references verified0 citation errors · 0 not checkable

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  • Aqueous fluids and their precipitates display Y/Ho ratios significantly higher than the molar ratio of 52 shown by common igneous rocks and epiclastic sediments, reaching molar ratios up to 90.

    “Aqueous fluids and their precipitates display Y/Ho ratios significantly higher than the molar ratio of 52 shown by common igneous rocks and epiclastic sediments (Bau, 1996, and references therein), reaching molar ratios up to 90 (Zhang et al., 1994; Bau et al., 1997; Nozaki et al., 1997).”

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Authors
Bau, M., Höhndorf, A., Dulski, P., & Beukes, N. J.
Affiliations
GFZ Helmholtz Centre for Geosciences (DE)
Venue
The Journal of Geology
Published
1997-01
Volume
105
Issue
1
Pages
121-129
ISSN
  • 0022-1376 (ISSN-L)
  • 1537-5269
OpenAlex
W2090903612
Cited by
86
References
21
Citations by year
2026: 4 · 2025: 3 · 2024: 6 · 2023: 6 · 2022: 5 · 2021: 7 · 2020: 6 · 2019: 1 · 2018: 3 · 2017: 5 · 2016: 7 · 2015: 3 · 2014: 4 · 2013: 2 · 2012: 2
FWCI
2.03
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Geology (publishedVersion)
  • Publication Database GFZ (GFZ German Research Centre for Geosciences) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
iron-formation, rare earth elements, Nd isotopes, Transvaal Supergroup, Paleoproterozoic, hydrothermal alteration, oceanic crust, Archean-Proterozoic boundary, open ocean, Hamersley Group

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