globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-0585-2
论文题名:
Steady erosion rates in the Himalayas through late Cenozoic climatic changes
作者: Lenard S.J.P.; Lavé J.; France-Lanord C.; Aumaître G.; Bourlès D.L.; Keddadouche K.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:6
起始页码: 448
结束页码: 452
语种: 英语
英文关键词: beryllium isotope ; Cenozoic ; climate variation ; concentration (composition) ; cosmic ray ; drainage basin ; erosion rate ; geoaccumulation ; glaciation ; isotopic composition ; neodymium isotope ; Northern Hemisphere ; research work ; seafloor ; strontium isotope ; Bay of Bengal ; Brahmaputra River ; Ganges River ; Himalayas ; Indian Ocean
英文摘要: Sediment accumulation rates and thermal trackers suggest a substantial and global increase in erosion rates over the past few million years. That increase is commonly associated with the impact of the Northern Hemisphere glaciation, but methodological biases have led researchers to debate this hypothesis. Here, we test whether Himalayan erosion rates increased by measuring beryllium-10 (10Be) in the sediment of the Bengal Bay seabed. Sediment originated from rocks that produced 10Be under the impact of cosmic rays during erosion near surface. Thus, the 10Be concentrations indicate erosion rates. The 10Be concentration of the Bengal Bay sediment depends on the contributions of the Ganga and Brahmaputra rivers. Their sediments have distinct 10Be concentrations because of distinct elevations and erosion in their drainage basins. Variable contributions could thus complicate erosion-rate calculation. We traced these contributions by a provenance study using the strontium (Sr) and neodymium (Nd) isotopic sediment compositions. Within uncertainties of ±30%, our reconstructed past erosion rates show no long-term increase for the past six million years. This stability suggests that climatic changes during the late Cenozoic have an undetectable impact on the erosion patterns in the Himalayas, at least on the ten thousand to million year timescales accounted for by our dataset. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169636
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作者单位: Université de Lorraine, CNRS, CRPG, Nancy, France; Université Aix-Marseille, CNRS-IRD-Collège de France, UM 34 CEREGE, Technopôle de l’Environnement Arbois-Méditerranée, Aix-en-Provence, France

Recommended Citation:
Lenard S.J.P.,Lavé J.,France-Lanord C.,et al. Steady erosion rates in the Himalayas through late Cenozoic climatic changes[J]. Nature Geoscience,2020-01-01,13(6)
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