Cited by 78Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

A Zn isotope perspective on the rise of continents

Pons, M.‐L., Fujii, T., Rosing, M., Quitté, G., Télouk, P., Albarède, F.·2013·Geobiology

Abstract

Zinc isotope abundances are fairly constant in igneous rocks and shales and are left unfractionated by hydrothermal processes at pH < 5.5. For that reason, Zn isotopes in sediments can be used to trace the changing chemistry of the hydrosphere. Here, we report Zn isotope compositions in Fe oxides from banded iron formations (BIFs) and iron formations of different ages. Zinc from early Archean samples is isotopically indistinguishable from the igneous average (δ(66) Zn ~0.3‰). At 2.9-2.7 Ga, δ(66) Zn becomes isotopically light (δ(66) Zn < 0‰) and then bounces back to values >1‰ during the ~2.35 Ga Great Oxygenation Event. By 1.8 Ga, BIF δ(66) Zn has settled to the modern value of FeMn nodules and encrustations (~0.9‰). The Zn cycle is largely controlled by two different mechanisms: Zn makes strong complexes with phosphates, and phosphates in turn are strongly adsorbed by Fe hydroxides. We therefore review the evidence that the surface geochemical cycles of Zn and P are closely related. The Zn isotope record echoes Sr isotope evidence, suggesting that erosion starts with the very large continental masses appearing at ~2.7 Ga. The lack of Zn fractionation in pre-2.9 Ga BIFs is argued to reflect the paucity of permanent subaerial continental exposure and consequently the insignificant phosphate input to the oceans and the small output of biochemical sediments. We link the early decline of δ(66) Zn between 3.0 and 2.7 Ga with the low solubility of phosphate in alkaline groundwater. The development of photosynthetic activity at the surface of the newly exposed continents increased the oxygen level in the atmosphere, which in turn triggered acid drainage and stepped up P dissolution and liberation of heavy Zn into the runoff. Zinc isotopes provide a new perspective on the rise of continents, the volume of carbonates on continents, changing weathering conditions, and compositions of the ocean through time.

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Crossref · 10.1111/gbi.12030

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  • These variations were considered rapid and governed by preferential incorporation of isotopically heavy Zn into carbonates and a significant increase in marine sediments exposed to weathering around 2.7 Ga due to increased continental land mass.

    “Variations were considered to be rapid and governed by two factors: preferential incorporation of isotopically heavy Zn into carbonates and a significant increase in the amount of marine sediments exposed to weathering around 2.7 Ga coincident as the result of increased continental land mass.”
  • A single study on Zn isotopes in iron formations found some of the most enriched δ66Zn values between 2.7 and 1.8 Ga.

    “A single study on Zn isotopes in IF (Pons et al., 2013) found some of the most enriched δ 66 Zn values between 2.7 Ga and 1.8 Ga.”

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Authors
Pons, M. ‐., Fujii, T., Rosing, M., Quitté, G., Télouk, P., & Albarède, F.
Affiliations
  • Lyon 1 Université (FR)
  • Kyoto University (JP)
  • Natural History Museum of Denmark (DK)
Corresponding author
Pons, M.‐L.
Venue
Geobiology
Publisher
Wiley
Published
2013-02-20
Volume
11
Issue
3
Pages
201-214
ISSN
  • 1472-4669 (ISSN-L)
  • 1472-4677
OpenAlex
W2063758912
Cited by
78
References
118
Citations by year
2026: 6 · 2025: 5 · 2024: 7 · 2023: 2 · 2022: 5 · 2021: 7 · 2020: 2 · 2019: 5 · 2018: 15 · 2017: 7 · 2016: 6 · 2015: 3 · 2014: 5 · 2013: 3
FWCI
3.84
Type
journal article
Language
en
Open access
closed
Locations
  • Geobiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • École Normale Supérieure
  • Danmarks Grundforskningsfond
  • École Normale Supérieure de Lyon
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
zinc isotopes, banded iron formations, iron-formation, Great Oxidation Event, phosphate cycling, iron hydroxide, continental weathering, subaerial exposure, alkaline groundwater, acid drainage, early Archean, paleoceanography, paleoatmosphere
MeSH terms
Carboxylic Acids, Chromatography, Ion Exchange, Ferric Compounds, Oceans and Seas, Phosphates, Seawater, Mass Spectrometry, Zinc Isotopes, Geologic Sediments, Evolution, Planetary

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