Iron isotopic systematics and ferric iron carriers of Phanerozoic continental red beds and implications for atmospheric oxygenation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F25%3A00638885" target="_blank" >RIV/67985831:_____/25:00638885 - isvavai.cz</a>
Alternative codes found
RIV/61989592:15310/25:73634446 RIV/00025798:_____/25:10169549
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0009254125004188?dgcid=author" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0009254125004188?dgcid=author</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.chemgeo.2025.123028" target="_blank" >10.1016/j.chemgeo.2025.123028</a>
Alternative languages
Result language
angličtina
Original language name
Iron isotopic systematics and ferric iron carriers of Phanerozoic continental red beds and implications for atmospheric oxygenation
Original language description
Continental red beds (CRB) are characteristic for their predominant red colour due to the widespread presence of ferric oxides (hematite or goethite) that might suggest distinctly oxygenated atmospheric conditions during their formation. Therefore, elemental and isotopic systematics of iron, a redox-sensitive element, can provide critical constraints on Fe cycling and possibly also palaeoredox conditions. However, our knowledge of the iron isotopic systematics (δ56Fe) of CRB remains very limited. This prevents to evaluate whether these rocks are useful to trace past atmospheric oxygenation. To fill the gap, we present an extensive dataset of Fe elemental and isotopic data, paralleled by Mössbauer and diffuse reflectance spectra, for classic Phanerozoic examples of CRB supplemented by the analyses of colour detrital grain coatings. The data reveal goethite as the principal phase within grey-green siliciclastic lithologies and detrital grain coatings. These samples show a positive correlation between Fe3+/FeT and δ56Fe (fine-grained lithologies) suggesting percolation of late-stage diagenetic fluids at variable redox and pH conditions connected with hematite dissolution. In contrast, the red facies are characterized by the predominance of hematite, largely variable FeT contents and δ56Fe values overlapping with those estimated for the upper continental crust. The overall lighter and more homogeneous δ56Fe values in Phanerozoic red beds compared to their Palaeoproterozoic (∼2.2 Ga) counterparts are consistent with more oxygenated atmosphere during the Phanerozoic. Therefore, the appearance of CRB may serve as an important marker of atmospheric oxygenation in the past.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA22-15405S" target="_blank" >GA22-15405S: Early diagenetic cycling of redox-sensitive geochemical proxies and palaeoclimatologic significance of continental red beds</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Chemical Geology
ISSN
0009-2541
e-ISSN
1872-6836
Volume of the periodical
695
Issue of the periodical within the volume
November
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
16
Pages from-to
123028
UT code for WoS article
001583395000001
EID of the result in the Scopus database
2-s2.0-105015539586