Cited by 43Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

Carbonate ooids of the Mesoarchaean Pongola Supergroup, South Africa

Siahi, M., Hofmann, A., Master, S., Mueller, C.W., Gerdes, A.·2017·Geobiology

Abstract

Abstract Ooids from the Mesoarchaean Chobeni Formation, Pongola Supergroup, KwaZulu‐Natal, South Africa are older than any ooids reported to date. They are made of dolomite and ankerite and show concentric, radial‐concentric, micritic, and radial fabrics. Radial ooids are interpreted to have originated from high‐Mg‐calcite and probably formed by microbial activity in a low‐energy regime, while concentric ooids had an aragonite precursor and formed biotically under agitated/high‐energy environmental conditions. Micritic ooids formed via the recrystallization of concentric ooids. Ooids and other allochems, such as intraclasts and peloids, contain carbonaceous matter. The close association of carbonaceous matter within ooid cortices with metabolically important elements, such as N, S and P, as identified by nano‐scale secondary ion mass spectrometry analysis, allows us to propose a biologically induced origin for some ooids. By analogy with modern examples, a variety of microbial communities probably played a role in carbonate precipitation and ooid formation. Shale‐normalized rare earth element ( REE ) distribution patterns of ooids and other allochems show positive La SN , Gd SN and Y SN anomalies, superchondritic Y/Ho ratios and depleted light rare earth elements ( LREE s) relative to the heavy rare earth elements ( HREE s), which resemble those of seawater. These anomalies are less pronounced than expected for an open marine setting, which is interpreted as evidence for deposition in restricted shallow marine environments. Non‐seawater REE patterns in recrystallized matrix and pore‐ and vein‐filling carbonate likely reflect redistribution of rare earth elements during post‐depositional alteration and/or reflect differences in the elemental and REE compositions of diagenetic fluids.

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Crossref · 10.1111/gbi.12249

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  • Granular iron formations first appear in the rock record at ca. 2.90 Ga, reach their acme at ca. 1.88 Ga, and are then replaced by ironstones in the Phanerozoic record after ca. 543 Ma.

    “GIF first appear in the rock record at ca. 2.90 Ga (Siahi et al., 2017), reach their acme at ca. 1.88 Ga, and are then replaced by ironstones in the Phanerozoic record (after ca. 543 Ma) (Bekker et al., 2014).”

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Authors
Siahi, M., Hofmann, A., Master, S., Mueller, C. W., & Gerdes, A.
Affiliations
  • University of the Witwatersrand (ZA)
  • University of Johannesburg (ZA)
  • Technical University of Munich (DE)
  • Goethe University Frankfurt (DE)
Corresponding author
Siahi, M.
Venue
Geobiology
Publisher
Wiley
Published
2017-07-24
Volume
15
Issue
6
Pages
750-766
ISSN
  • 1472-4669 (ISSN-L)
  • 1472-4677
OpenAlex
W2737064551
Cited by
43
References
84
Citations by year
2026: 2 · 2025: 6 · 2024: 5 · 2023: 9 · 2022: 4 · 2021: 4 · 2020: 2 · 2019: 5 · 2018: 4 · 2017: 2
FWCI
2.53
Type
journal article
Language
en
Open access
closed
Locations
  • Geobiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Kempe Foundation
  • Technische Universität München
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
Mesoarchaean, Pongola Supergroup, microbial carbonate precipitation, rare earth elements, dolomite, ankerite, diagenetic fluids, KwaZulu-Natal
MeSH terms
Calcium Carbonate, Carbonates, Magnesium, Paleontology, Seawater, South Africa, Geologic Sediments

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