Yu, Zhaojie;
Song, Zehua;
Tang, Xiaojie;
Wilson, David J;
Bayon, Germain;
Huang, Yi;
Kang, Xiaoying;
... Colin, Christophe; + view all
(2025)
Neodymium isotopes in marginal seawater trace continental weathering inputs.
Geochimica et Cosmochimica Acta
10.1016/j.gca.2025.12.003.
(In press).
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Abstract
Continental weathering of silicate rocks has long been proposed as an important regulator of Earth’s climate over geological timescales. However, whether silicate weathering fluxes have increased, decreased, or remained unchanged during the Cenozoic, and across glacial-interglacial cycles, remains under debate. A major source of uncertainty stems from the multiple controls on weathering proxies and a lack of consistency between existing records. Seawater neodymium (Nd) isotopes have been extensively used to trace the mixing and evolution of water masses in the open ocean. Here, an emerging application of seawater Nd isotopes to trace continental weathering inputs based on marine sediment records from marginal settings is reviewed and applied to the northern Indian Ocean. Seawater Nd isotope observations and reconstructions in the Bay of Bengal spanning a range of timescales (modern – millennial – orbital – tectonic) reveal a strong influence of South Asian continental weathering inputs, which may be related to drivers such as Himalayan tectonic uplift and monsoon precipitation. The long-term evolution of seawater Nd isotopes in the Bay of Bengal has the potential to trace the evolving Himalayan weathering inputs since the Oligocene, and to reveal the links between tectonics, climate, and weathering, while there were also weathering changes on orbital timescales in the Pleistocene. While demonstrating the strong potential of marginal seawater Nd isotopes in tracing past continental weathering inputs, more research on particle-seawater interaction processes and on the quantitative relationship between Nd isotopes and weathering inputs is still needed.
| Type: | Article |
|---|---|
| Title: | Neodymium isotopes in marginal seawater trace continental weathering inputs |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.gca.2025.12.003 |
| Publisher version: | https://doi.org/10.1016/j.gca.2025.12.003 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For the purpose of open access, the author(s) has applied a Creative Commons Attribution (CC BY) licence to any Author Accepted Manuscript version arising from this submission. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10218970 |
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