Redox through Earth history

Last updated on March 31, 2021

Redox evolution of the ocean and atmosphere in the Archean, Proterozoic, and Paleozoic, as well as its effects on the biosphere and global elemental cycles.

Kaarel Mänd
Kaarel Mänd
Research Fellow at the University of Tartu

My research focuses on investigating Precambrian redox conditions using trace metal based redox proxies.

Publications

Iron Isotopes Reveal a Benthic Iron Shuttle in the Palaeoproterozoic Zaonega Formation: Basinal Restriction, Euxinia, and the Effect on Global Palaeoredox Proxies
The Zaonega Formation in northwest Russia (~ 2.0 billion years old) is amongst the most complete successions that record the middle of …
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Iron Isotopes Reveal a Benthic Iron Shuttle in the Palaeoproterozoic Zaonega Formation: Basinal Restriction, Euxinia, and the Effect on Global Palaeoredox Proxies
Depositional and environmental constraints on the late Neoarchean Dagushan deposit (Anshan-Benxi area, North China Craton): An Algoma-type banded iron formation
The late Neoarchean, ~ 2.53 to 2.51 Ga Dagushan banded iron formation (BIF), is a typical Algoma-type BIF located in the northeast part …
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Depositional and environmental constraints on the late Neoarchean Dagushan deposit (Anshan-Benxi area, North China Craton): An Algoma-type banded iron formation
Iron and carbon isotope constraints on the formation pathway of iron-rich carbonates within the Dagushan Iron Formation, North China Craton
Banded iron formations (BIFs) are enigmatic chemical sedimentary rocks that chronicle the geochemical and microbial cycling of iron and …
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Iron and carbon isotope constraints on the formation pathway of iron-rich carbonates within the Dagushan Iron Formation, North China Craton
Oxygenated conditions in the aftermath of the Lomagundi-Jatuli Event: The carbon isotope and rare earth element signatures of the Paleoproterozoic Zaonega Formation, Russia
The c. 2.0 Ga Zaonega Formation of the Onega Basin (NW Russia) has been central in efforts to understand what led to the initial rise …
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Oxygenated conditions in the aftermath of the Lomagundi-Jatuli Event: The carbon isotope and rare earth element signatures of the Paleoproterozoic Zaonega Formation, Russia
Identifying global vs. basinal controls on Paleoproterozoic organic carbon and sulfur isotope records
Paleoproterozoic sedimentary successions are important archives of the redox evolution of Earth’s atmosphere and oceans. Efforts to …
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Identifying global vs. basinal controls on Paleoproterozoic organic carbon and sulfur isotope records
Hydrothermally induced $^{34}$S enrichment in pyrite as an alternative explanation of the Late-Devonian sulfur isotope excursion in South China
Several Late Devonian sedimentary successions host pyrite with highly positive sulfur isotope values (δ34Spyrite). These anomalous …
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Hydrothermally induced $^{34}$S enrichment in pyrite as an alternative explanation of the Late-Devonian sulfur isotope excursion in South China
Palaeoproterozoic oxygenated oceans following the Lomagundi–Jatuli Event
The oceans probably remained well-oxygenated for millions of years after the Palaeoproterozoic Lomagundi–Jatuli Event, according to high concentrations and isotope signatures of redox-sensitive metals in the 2-billion-year-old Zaonega Formation, Russia.
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Palaeoproterozoic oxygenated oceans following the Lomagundi–Jatuli Event
High-CO$\\_2$, acidic and oxygen-starved weathering at the Fennoscandian Shield at the Archean-Proterozoic transition
Chemical weathering of continental crust plays an important role in Earth‘s surface evolution and also controls the nutrient flow to …
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High-CO$\\_2$, acidic and oxygen-starved weathering at the Fennoscandian Shield at the Archean-Proterozoic transition
Multiple sulphur isotope records tracking basinal and global processes in the 1.98 Ga Zaonega Formation, NW Russia
The exceptionally organic-rich rocks of the 1.98 Ga Zaonega Formation deposited in the Onega Basin, NW Russia, have refined our …
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Multiple sulphur isotope records tracking basinal and global processes in the 1.98 Ga Zaonega Formation, NW Russia