Universität zu Köln

Kurzweil, Florian ORCID: 0000-0002-8202-1475, Archer, Corey, Wille, Martin ORCID: 0000-0003-1083-4730, Schoenberg, Ronny, Munker, Carsten ORCID: 0000-0001-6406-559X and Dellwig, Olaf ORCID: 0000-0002-0028-8812 (2021). Redox control on the tungsten isotope composition of seawater. Proc. Natl. Acad. Sci. U. S. A., 118 (18). WASHINGTON: NATL ACAD SCIENCES. ISSN 0027-8424

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Abstract

Free oxygen represents an essential basis for the evolution of complex life forms on a habitable Earth. The isotope composition of redox-sensitive trace elements such as tungsten (W) can possibly trace the earliest rise of oceanic oxygen in Earth?s history. However, the impact of redox changes on the W isotope composition of seawater is still unknown. Here, we report highly variable W isotope compositions in the water column of a redox-stratified basin (?186/184W between +0.347 and +0.810 %a) that contrast with the homogenous W isotope composition of the open ocean (refined ?186/184W of +0.543 ? 0.046 %a). Consistent with experimental studies, the preferential scavenging of isotopically light W by Mn-oxides increases the ?186/184W of surrounding seawater, whereas the redissolution of Mn-oxides causes decreasing seawater ?186/184W. Overall, the distinctly heavy stable W isotopic signature of open ocean seawater mirrors predominantly fully oxic conditions in modern oceans. We expect, however, that the redox evolution from anoxic to hypoxic and finally oxic marine conditions in early Earth?s history would have continuously increased the seawater ?186/184W. Stable W isotope compositions of chemical sediments that potentially preserve changing seawater W isotope signatures might therefore reflect global changes in marine redox conditions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kurzweil, Florian UNSPECIFIED orcid.org/0000-0002-8202-1475 UNSPECIFIED Archer, Corey UNSPECIFIED UNSPECIFIED UNSPECIFIED Wille, Martin UNSPECIFIED orcid.org/0000-0003-1083-4730 UNSPECIFIED Schoenberg, Ronny UNSPECIFIED UNSPECIFIED UNSPECIFIED Munker, Carsten UNSPECIFIED orcid.org/0000-0001-6406-559X UNSPECIFIED Dellwig, Olaf UNSPECIFIED orcid.org/0000-0002-0028-8812 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-593073
DOI:	10.1073/pnas.2023544118
Journal or Publication Title:	Proc. Natl. Acad. Sci. U. S. A.
Volume:	118
Number:	18
Date:	2021
Publisher:	NATL ACAD SCIENCES
Place of Publication:	WASHINGTON
ISSN:	0027-8424
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SULFIDIC WATERS; MOLYBDENUM; FRACTIONATION; MANGANESE; ADSORPTION; SPECIATION; OXIDES; SEA; MO; FE Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59307