A Hydrochemical Method for Identifying Orbital Imprints of Dust in Paleofluvial Sequences
| Title: | A Hydrochemical Method for Identifying Orbital Imprints of Dust in Paleofluvial Sequences |
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| Authors: | Zhongyi Yan, Yibo Yang, Wenxia Han, Yudong Liu, Xiaoming Liu, Xiaomin Fang |
| Source: | Geophysical Research Letters, Vol 51, Iss 14, Pp n/a-n/a (2024) |
| Publisher Information: | Wiley, 2024. |
| Publication Year: | 2024 |
| Collection: | LCC:Geophysics. Cosmic physics |
| Subject Terms: | Geophysics. Cosmic physics, QC801-809 |
| More Details: | Abstract Mineral dust plays an important role in Earth's climate system, yet it is difficult to identify dust imprints in paleofluvial sediments, especially on orbital timescales. Here, we present high‐resolution authigenic carbonate Ca–Mg–Sr compositions in a fluvial sequence under the transport pathway of Asian dust. The Mg/Ca, Sr/Ca, and Mg/Sr ratios exhibit distinct transitions in both secular trends and orbital cycles at ∼8 Ma. Before ∼8 Ma, given similar Mg and Sr partitioning behaviors during carbonate formation, hydroclimate changes yielded strong orbital signals in the Sr/Ca and Mg/Ca ratios but no detectable signals in the Mg/Sr ratios. After ∼8 Ma, given the strengthened input of Mg‐rich dust during cold‒dry periods, the Mg/Sr and Mg/Ca ratios clearly exhibited orbital signals, but the Sr/Ca ratio did not. Such transitions in carbonate composition corroborate the dust‐induced changes in fluvial hydrochemistry, offering an innovative methodology for detecting orbital dust cycles in paleofluvial systems. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1944-8007 0094-8276 |
| Relation: | https://doaj.org/toc/0094-8276; https://doaj.org/toc/1944-8007 |
| DOI: | 10.1029/2024GL109988 |
| Access URL: | https://doaj.org/article/37852ce9a979454da723246a64f8f23e |
| Accession Number: | edsdoj.37852ce9a979454da723246a64f8f23e |
| Database: | Directory of Open Access Journals |
| ISSN: | 19448007 00948276 |
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| DOI: | 10.1029/2024GL109988 |
| Published in: | Geophysical Research Letters |
| Language: | English |