Centennial to millennial-scale paleoenvironmental record from a coastal iron-manganese concretion

Joonas Wasiljeff; Yann Lahaye; Arttu Lehtonen; Roger Fu; Johanna M. Salminen; Radoslaw M. Michallik; Matti Kurhila; Minna Myllyperkiö; Joonas J. Virtasalo

doi:10.1038/s43247-025-02741-z

Centennial to millennial-scale paleoenvironmental record from a coastal iron-manganese concretion

Joonas Wasiljeff, Yann Lahaye, Arttu Lehtonen, Roger Fu, Johanna M. Salminen, Radoslaw M. Michallik, Matti Kurhila, Minna Myllyperkiö, Joonas J. Virtasalo

Tutkimustuotos: Lehtiartikkeli › Article › Scientific › vertaisarvioitu

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Abstract: Coastal sea ecosystems are increasingly threatened by global change and human activities. Our understanding of these changes is limited, especially in dynamic coastal regions lacking thick sediment sequences. Iron-manganese concretions, biogeochemical precipitates on the seafloor, grow in non-depositional coastal areas and record numerous marine processes and environmental variability. Establishing reliable geochronology for these precipitates has been challenging. We combine anthropogenic lead accumulation, cobalt chronometry, and radiocarbon dating to develop a high-resolution Bayesian age model for a rapidly growing iron-manganese concretion from the Baltic Sea. The concretion core formed ca. 11,000 cal. BP, with overgrown material showing successively younger ages from 7500 years ago to recent decades. Analyses of microstructure, magnetic microscopy, and bulk mineral magnetic properties, trace elements, and iron isotopic composition reveal that the concretion records environmental variability over the past 7000 years. Our study may serve as a benchmark for paleoenvironmental records from coastal iron-manganese concretions.

Alkuperäiskieli	Englanti
Artikkeli	771
Sivumäärä	12
Julkaisu	Communications Earth & Environment
Vuosikerta	6
Numero	1
DOI - pysyväislinkit	https://doi.org/10.1038/s43247-025-02741-z
Tila	Julkaistu - jouluk. 2025
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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We are grateful for the constructive comments by Rashida Doctor and two anonymous reviewers that greatly improved our work. We thank the crew of r/v Geomari for sampling assistance, Meiru Zhou for help in sample preparations in the lab, and Ilia Rodushkin for the iron isotope analyses. We also thank Xiaodong Jiang and Xiang Zhao for providing the original age model code and for initial guidance. We further acknowledge Ossi Arasalo for insightful comments and contributions during the development of the age model. We also want to thank Tomasz Goslar for the radiocarbon dating. This work was supported by the Research Council of Finland (Fermaid project, grant 332249). This study has used research facilities provided by the Finnish Marine Research Infrastructure (FINMARI) network. This is HelLabs publication #0028. No permissions were required for sampling.

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10.1038/s43247-025-02741-zLisenssi: CC BY

Centennial_to_millennial-scaleFinal published version, 4,46 MBLisenssi: CC BY

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title = "Centennial to millennial-scale paleoenvironmental record from a coastal iron-manganese concretion",

abstract = "Abstract: Coastal sea ecosystems are increasingly threatened by global change and human activities. Our understanding of these changes is limited, especially in dynamic coastal regions lacking thick sediment sequences. Iron-manganese concretions, biogeochemical precipitates on the seafloor, grow in non-depositional coastal areas and record numerous marine processes and environmental variability. Establishing reliable geochronology for these precipitates has been challenging. We combine anthropogenic lead accumulation, cobalt chronometry, and radiocarbon dating to develop a high-resolution Bayesian age model for a rapidly growing iron-manganese concretion from the Baltic Sea. The concretion core formed ca. 11,000 cal. BP, with overgrown material showing successively younger ages from 7500 years ago to recent decades. Analyses of microstructure, magnetic microscopy, and bulk mineral magnetic properties, trace elements, and iron isotopic composition reveal that the concretion records environmental variability over the past 7000 years. Our study may serve as a benchmark for paleoenvironmental records from coastal iron-manganese concretions.",

author = "Joonas Wasiljeff and Yann Lahaye and Arttu Lehtonen and Roger Fu and Salminen, \{Johanna M.\} and Michallik, \{Radoslaw M.\} and Matti Kurhila and Minna Myllyperki{\"o} and Virtasalo, \{Joonas J.\}",

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doi = "10.1038/s43247-025-02741-z",

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AU - Wasiljeff, Joonas

AU - Lahaye, Yann

AU - Lehtonen, Arttu

AU - Fu, Roger

AU - Salminen, Johanna M.

AU - Michallik, Radoslaw M.

AU - Kurhila, Matti

AU - Myllyperkiö, Minna

AU - Virtasalo, Joonas J.

PY - 2025/12

Y1 - 2025/12

N2 - Abstract: Coastal sea ecosystems are increasingly threatened by global change and human activities. Our understanding of these changes is limited, especially in dynamic coastal regions lacking thick sediment sequences. Iron-manganese concretions, biogeochemical precipitates on the seafloor, grow in non-depositional coastal areas and record numerous marine processes and environmental variability. Establishing reliable geochronology for these precipitates has been challenging. We combine anthropogenic lead accumulation, cobalt chronometry, and radiocarbon dating to develop a high-resolution Bayesian age model for a rapidly growing iron-manganese concretion from the Baltic Sea. The concretion core formed ca. 11,000 cal. BP, with overgrown material showing successively younger ages from 7500 years ago to recent decades. Analyses of microstructure, magnetic microscopy, and bulk mineral magnetic properties, trace elements, and iron isotopic composition reveal that the concretion records environmental variability over the past 7000 years. Our study may serve as a benchmark for paleoenvironmental records from coastal iron-manganese concretions.

AB - Abstract: Coastal sea ecosystems are increasingly threatened by global change and human activities. Our understanding of these changes is limited, especially in dynamic coastal regions lacking thick sediment sequences. Iron-manganese concretions, biogeochemical precipitates on the seafloor, grow in non-depositional coastal areas and record numerous marine processes and environmental variability. Establishing reliable geochronology for these precipitates has been challenging. We combine anthropogenic lead accumulation, cobalt chronometry, and radiocarbon dating to develop a high-resolution Bayesian age model for a rapidly growing iron-manganese concretion from the Baltic Sea. The concretion core formed ca. 11,000 cal. BP, with overgrown material showing successively younger ages from 7500 years ago to recent decades. Analyses of microstructure, magnetic microscopy, and bulk mineral magnetic properties, trace elements, and iron isotopic composition reveal that the concretion records environmental variability over the past 7000 years. Our study may serve as a benchmark for paleoenvironmental records from coastal iron-manganese concretions.

UR - https://www.scopus.com/pages/publications/105017659139

U2 - 10.1038/s43247-025-02741-z

DO - 10.1038/s43247-025-02741-z

M3 - Article

SN - 2662-4435

VL - 6

JO - Communications Earth & Environment

JF - Communications Earth & Environment

IS - 1

M1 - 771

ER -

Centennial to millennial-scale paleoenvironmental record from a coastal iron-manganese concretion

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