K isotopes as a tracer for continental weathering and geological K cycling
The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable potassium (K) isotopes can potentially overcome the limitations of existing isotopic proxies. Here we report on a systematic investigation of...
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| Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 116; no. 18; pp. 8740 - 8745 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
National Academy of Sciences
30.04.2019
|
| Subjects | |
| Online Access | Get full text |
| ISSN | 0027-8424 1091-6490 1091-6490 |
| DOI | 10.1073/pnas.1811282116 |
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| Abstract | The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable potassium (K) isotopes can potentially overcome the limitations of existing isotopic proxies. Here we report on a systematic investigation of K isotopes in dissolved load and sediments from major rivers and their tributaries in China, which have drainage basins with varied climate, lithology, and topography. Our results show that during silicate weathering, heavy K isotopes are preferentially partitioned into aqueous solutions. Moreover, δ
41K values of riverine dissolved load vary remarkably and correlate negatively with the chemical weathering intensity of the drainage basin. This correlation allows an estimate of the average K isotope composition of global riverine runoff (δ
41K = −0.22‰), as well as modeling of the global K cycle based on mass balance calculations. Modeling incorporating K isotope mass balance better constrains estimated K fluxes for modern global K cycling, and the results show that the δ
41K value of seawater is sensitive to continental weathering intensity changes. Thus, it is possible to use the δ
41K record of paleo-seawater to infer continental weathering intensity through Earth’s history. |
|---|---|
| AbstractList | The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable potassium (K) isotopes can potentially overcome the limitations of existing isotopic proxies. Here we report on a systematic investigation of K isotopes in dissolved load and sediments from major rivers and their tributaries in China, which have drainage basins with varied climate, lithology, and topography. Our results show that during silicate weathering, heavy K isotopes are preferentially partitioned into aqueous solutions. Moreover, δ
K values of riverine dissolved load vary remarkably and correlate negatively with the chemical weathering intensity of the drainage basin. This correlation allows an estimate of the average K isotope composition of global riverine runoff (δ
K = -0.22‰), as well as modeling of the global K cycle based on mass balance calculations. Modeling incorporating K isotope mass balance better constrains estimated K fluxes for modern global K cycling, and the results show that the δ
K value of seawater is sensitive to continental weathering intensity changes. Thus, it is possible to use the δ
K record of paleo-seawater to infer continental weathering intensity through Earth's history. The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable potassium (K) isotopes can potentially overcome the limitations of existing isotopic proxies. Here we report on a systematic investigation of K isotopes in dissolved load and sediments from major rivers and their tributaries in China, which have drainage basins with varied climate, lithology, and topography. Our results show that during silicate weathering, heavy K isotopes are preferentially partitioned into aqueous solutions. Moreover, δ41K values of riverine dissolved load vary remarkably and correlate negatively with the chemical weathering intensity of the drainage basin. This correlation allows an estimate of the average K isotope composition of global riverine runoff (δ41K = -0.22‰), as well as modeling of the global K cycle based on mass balance calculations. Modeling incorporating K isotope mass balance better constrains estimated K fluxes for modern global K cycling, and the results show that the δ41K value of seawater is sensitive to continental weathering intensity changes. Thus, it is possible to use the δ41K record of paleo-seawater to infer continental weathering intensity through Earth's history.The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable potassium (K) isotopes can potentially overcome the limitations of existing isotopic proxies. Here we report on a systematic investigation of K isotopes in dissolved load and sediments from major rivers and their tributaries in China, which have drainage basins with varied climate, lithology, and topography. Our results show that during silicate weathering, heavy K isotopes are preferentially partitioned into aqueous solutions. Moreover, δ41K values of riverine dissolved load vary remarkably and correlate negatively with the chemical weathering intensity of the drainage basin. This correlation allows an estimate of the average K isotope composition of global riverine runoff (δ41K = -0.22‰), as well as modeling of the global K cycle based on mass balance calculations. Modeling incorporating K isotope mass balance better constrains estimated K fluxes for modern global K cycling, and the results show that the δ41K value of seawater is sensitive to continental weathering intensity changes. Thus, it is possible to use the δ41K record of paleo-seawater to infer continental weathering intensity through Earth's history. The potassium stable isotope system is a powerful new geochemical tool for understanding continental weathering linked to Earth’s climate. Potassium isotopes fractionate strongly during silicate weathering, and δ 41 K values in riverine dissolved loads correlate with the silicate weathering intensity of drainage basins. We provide an estimate of the δ 41 K value for the global riverine input into the oceans and demonstrate the sensitivity of δ 41 K in seawater to the continental silicate weathering process. The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable potassium (K) isotopes can potentially overcome the limitations of existing isotopic proxies. Here we report on a systematic investigation of K isotopes in dissolved load and sediments from major rivers and their tributaries in China, which have drainage basins with varied climate, lithology, and topography. Our results show that during silicate weathering, heavy K isotopes are preferentially partitioned into aqueous solutions. Moreover, δ 41 K values of riverine dissolved load vary remarkably and correlate negatively with the chemical weathering intensity of the drainage basin. This correlation allows an estimate of the average K isotope composition of global riverine runoff (δ 41 K = −0.22‰), as well as modeling of the global K cycle based on mass balance calculations. Modeling incorporating K isotope mass balance better constrains estimated K fluxes for modern global K cycling, and the results show that the δ 41 K value of seawater is sensitive to continental weathering intensity changes. Thus, it is possible to use the δ 41 K record of paleo-seawater to infer continental weathering intensity through Earth’s history. The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable potassium (K) isotopes can potentially overcome the limitations of existing isotopic proxies. Here we report on a systematic investigation of K isotopes in dissolved load and sediments from major rivers and their tributaries in China, which have drainage basins with varied climate, lithology, and topography. Our results show that during silicate weathering, heavy K isotopes are preferentially partitioned into aqueous solutions. Moreover, δ41K values of riverine dissolved load vary remarkably and correlate negatively with the chemical weathering intensity of the drainage basin. This correlation allows an estimate of the average K isotope composition of global riverine runoff (δ41K = −0.22‰), as well as modeling of the global K cycle based on mass balance calculations. Modeling incorporating K isotope mass balance better constrains estimated K fluxes for modern global K cycling, and the results show that the δ41K value of seawater is sensitive to continental weathering intensity changes. Thus, it is possible to use the δ41K record of paleo-seawater to infer continental weathering intensity through Earth’s history. The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable potassium (K) isotopes can potentially overcome the limitations of existing isotopic proxies. Here we report on a systematic investigation of K isotopes in dissolved load and sediments from major rivers and their tributaries in China, which have drainage basins with varied climate, lithology, and topography. Our results show that during silicate weathering, heavy K isotopes are preferentially partitioned into aqueous solutions. Moreover, δ 41K values of riverine dissolved load vary remarkably and correlate negatively with the chemical weathering intensity of the drainage basin. This correlation allows an estimate of the average K isotope composition of global riverine runoff (δ 41K = −0.22‰), as well as modeling of the global K cycle based on mass balance calculations. Modeling incorporating K isotope mass balance better constrains estimated K fluxes for modern global K cycling, and the results show that the δ 41K value of seawater is sensitive to continental weathering intensity changes. Thus, it is possible to use the δ 41K record of paleo-seawater to infer continental weathering intensity through Earth’s history. |
| Author | Beard, Brian L. Chen, Jun Li, Weiqiang Raymo, Maureen E. |
| Author_xml | – sequence: 2 givenname: Weiqiang surname: Li fullname: Li, Weiqiang – sequence: 3 givenname: Brian L. surname: Beard fullname: Beard, Brian L. – sequence: 4 givenname: Maureen E. surname: Raymo fullname: Raymo, Maureen E. – sequence: 7 givenname: Jun surname: Chen fullname: Chen, Jun |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/30988182$$D View this record in MEDLINE/PubMed |
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| Copyright | Copyright National Academy of Sciences Apr 30, 2019 2019 |
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| Keywords | rivers fractionation K isotopes K cycling continental weathering |
| Language | English |
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| Notes | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 Edited by Mark H. Thiemens, University of California at San Diego, La Jolla, CA, and approved March 22, 2019 (received for review June 30, 2018) Author contributions: S.L., W.L., Y.C., and J.C. designed research; S.L., W.L., and X.W. performed research; W.L. and B.L.B. contributed new reagents/analytic tools; S.L., W.L., B.L.B., and M.E.R. analyzed data; and S.L. and W.L. wrote the paper. |
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| Snippet | The causal effects among uplift, climate, and continental weathering cannot be fully addressed using presently available geochemical proxies. However, stable... The potassium stable isotope system is a powerful new geochemical tool for understanding continental weathering linked to Earth’s climate. Potassium isotopes... |
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| SubjectTerms | Aqueous solutions Basins Cycles Drainage Drainage basins Fluxes Isotope composition Isotopes Lithology Mass balance Modelling Organic chemistry Physical Sciences Rivers Runoff Seawater Sediment load Sediments Tributaries Uplift Weathering |
| Title | K isotopes as a tracer for continental weathering and geological K cycling |
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