Redox control on the tungsten isotope composition of seawater
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 th...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2021-05, Vol.118 (18), p.1-6 |
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| creator | Kurzweil, Florian Archer, Corey Wille, Martin Schoenberg, Ronny Münker, Carsten Dellwig, Olaf |
| description | 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 (δ186/184W between +0.347 and +0.810 ‰) that contrast with the homogenous W isotope composition of the open ocean (refined δ186/184W of +0.543 ± 0.046 ‰). Consistent with experimental studies, the preferential scavenging of isotopically light W by Mn-oxides increases the δ186/184W of surrounding seawater, whereas the redissolution of Mn-oxides causes decreasing seawater δ186/184W. 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 δ186/184W. Stable W isotope compositions of chemical sediments that potentially preserve changing seawater W isotope signatures might therefore reflect global changes in marine redox conditions. |
| doi_str_mv | 10.1073/pnas.2023544118 |
| format | Article |
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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 (δ186/184W between +0.347 and +0.810 ‰) that contrast with the homogenous W isotope composition of the open ocean (refined δ186/184W of +0.543 ± 0.046 ‰). Consistent with experimental studies, the preferential scavenging of isotopically light W by Mn-oxides increases the δ186/184W of surrounding seawater, whereas the redissolution of Mn-oxides causes decreasing seawater δ186/184W. 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 δ186/184W. Stable W isotope compositions of chemical sediments that potentially preserve changing seawater W isotope signatures might therefore reflect global changes in marine redox conditions.</description><identifier>ISSN: 0027-8424</identifier><identifier>EISSN: 1091-6490</identifier><identifier>DOI: 10.1073/pnas.2023544118</identifier><identifier>PMID: 33906947</identifier><language>eng</language><publisher>United States: National Academy of Sciences</publisher><subject>Chemical composition ; Chemical sediments ; Earth ; Evolution ; Hypoxia ; Isotope composition ; Isotopes ; Oceans ; Oxygen ; Physical Sciences ; Scavenging ; Seawater ; Sediments ; Trace elements ; Tungsten ; Tungsten isotopes ; Water circulation ; Water column</subject><ispartof>Proceedings of the National Academy of Sciences - PNAS, 2021-05, Vol.118 (18), p.1-6</ispartof><rights>Copyright National Academy of Sciences May 4, 2021</rights><rights>2021</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c509t-8ee9f17cdcce3925a448cffcdc60f07a9834ae0be6fc346ae4caf703e03062d53</citedby><cites>FETCH-LOGICAL-c509t-8ee9f17cdcce3925a448cffcdc60f07a9834ae0be6fc346ae4caf703e03062d53</cites><orcidid>0000-0001-6406-559X ; 0000-0002-6070-6297 ; 0000-0002-8202-1475 ; 0000-0003-1083-4730 ; 0000-0002-0028-8812</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/27040320$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/27040320$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>230,314,723,776,780,799,881,27901,27902,53766,53768,57992,58225</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/33906947$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Kurzweil, Florian</creatorcontrib><creatorcontrib>Archer, Corey</creatorcontrib><creatorcontrib>Wille, Martin</creatorcontrib><creatorcontrib>Schoenberg, Ronny</creatorcontrib><creatorcontrib>Münker, Carsten</creatorcontrib><creatorcontrib>Dellwig, Olaf</creatorcontrib><title>Redox control on the tungsten isotope composition of seawater</title><title>Proceedings of the National Academy of Sciences - PNAS</title><addtitle>Proc Natl Acad Sci U S A</addtitle><description>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 (δ186/184W between +0.347 and +0.810 ‰) that contrast with the homogenous W isotope composition of the open ocean (refined δ186/184W of +0.543 ± 0.046 ‰). Consistent with experimental studies, the preferential scavenging of isotopically light W by Mn-oxides increases the δ186/184W of surrounding seawater, whereas the redissolution of Mn-oxides causes decreasing seawater δ186/184W. 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 δ186/184W. Stable W isotope compositions of chemical sediments that potentially preserve changing seawater W isotope signatures might therefore reflect global changes in marine redox conditions.</description><subject>Chemical composition</subject><subject>Chemical sediments</subject><subject>Earth</subject><subject>Evolution</subject><subject>Hypoxia</subject><subject>Isotope composition</subject><subject>Isotopes</subject><subject>Oceans</subject><subject>Oxygen</subject><subject>Physical Sciences</subject><subject>Scavenging</subject><subject>Seawater</subject><subject>Sediments</subject><subject>Trace elements</subject><subject>Tungsten</subject><subject>Tungsten isotopes</subject><subject>Water circulation</subject><subject>Water column</subject><issn>0027-8424</issn><issn>1091-6490</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNpdkUlLBDEQhYMoOi5nT0qDFy-tlaWXHBRkcANBED2HmKloDz2dNkm7_HszjI7LqSjeV496PEJ2KRxRqPhx3-lwxIDxQghK6xUyoiBpXgoJq2QEwKq8FkxskM0QpgAgixrWyQbnEkopqhE5ucOJe8-M66J3bea6LD5jFofuKUTssia46HpM-qx3oYlNApzNAuo3HdFvkzWr24A7X3OLPFyc34-v8pvby-vx2U1uCpAxrxGlpZWZGINcskILURtr016ChUrLmguN8IilNVyUGoXRtgKOwKFkk4JvkdOFbz88znBiMH2rW9X7Zqb9h3K6UX-VrnlWT-5V1RRKzmQyOPwy8O5lwBDVrAkG21Z36IagWEElp4WQc_TgHzp1g-9SvEQxTktZQZ2o4wVlvAvBo10-Q0HNq1HzatRPNeli_3eGJf_dRQL2FsA0ROeXOqtAAGfAPwEyaJV9</recordid><startdate>20210504</startdate><enddate>20210504</enddate><creator>Kurzweil, Florian</creator><creator>Archer, Corey</creator><creator>Wille, Martin</creator><creator>Schoenberg, Ronny</creator><creator>Münker, Carsten</creator><creator>Dellwig, Olaf</creator><general>National Academy of Sciences</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7QL</scope><scope>7QP</scope><scope>7QR</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TK</scope><scope>7TM</scope><scope>7TO</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0001-6406-559X</orcidid><orcidid>https://orcid.org/0000-0002-6070-6297</orcidid><orcidid>https://orcid.org/0000-0002-8202-1475</orcidid><orcidid>https://orcid.org/0000-0003-1083-4730</orcidid><orcidid>https://orcid.org/0000-0002-0028-8812</orcidid></search><sort><creationdate>20210504</creationdate><title>Redox control on the tungsten isotope composition of seawater</title><author>Kurzweil, Florian ; 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| subjects | Chemical composition Chemical sediments Earth Evolution Hypoxia Isotope composition Isotopes Oceans Oxygen Physical Sciences Scavenging Seawater Sediments Trace elements Tungsten Tungsten isotopes Water circulation Water column |
| title | Redox control on the tungsten isotope composition of seawater |
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