Evidence for the oxidation of Earth's crust from the evolution of manganese minerals.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
18 Feb 2022
18 Feb 2022
Historique:
received:
30
08
2017
accepted:
06
01
2022
entrez:
19
2
2022
pubmed:
20
2
2022
medline:
20
2
2022
Statut:
epublish
Résumé
Analysis of manganese mineral occurrences and valence states demonstrate oxidation of Earth's crust through time. Changes in crustal redox state are critical to Earth's evolution, but few methods exist for evaluating spatially averaged crustal redox state through time. Manganese (Mn) is a redox-sensitive metal whose variable oxidation states and abundance in crustal minerals make it a useful tracer of crustal oxidation. We find that the average oxidation state of crustal Mn occurrences has risen in the last 1 billion years in response to atmospheric oxygenation following a 66 ± 1 million-year time lag. We interpret this lag as the average time necessary to equilibrate the shallow crust to atmospheric oxygen fugacity. This study employs large mineralogical databases to evaluate geochemical conditions through Earth's history, and we propose that this and other mineral data sets form an important class of proxies that constrain the evolving redox state of various Earth reservoirs.
Identifiants
pubmed: 35181670
doi: 10.1038/s41467-022-28589-x
pii: 10.1038/s41467-022-28589-x
pmc: PMC8857192
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
960Informations de copyright
© 2022. The Author(s).
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