气候变化领域集成服务门户(CCPortal): Steady erosion rates in the Himalayas through late Cenozoic climatic changes

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DOI	10.1038/s41561-020-0585-2
	Steady erosion rates in the Himalayas through late Cenozoic climatic changes
	Lenard S.J.P.; Lavé J.; France-Lanord C.; Aumaître G.; Bourlès D.L.; Keddadouche K.
发表日期	2020
ISSN	17520894
起始页码	448
结束页码	452
卷号	13 期号:6
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.
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
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206802
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
推荐引用方式 GB/T 7714	Lenard S.J.P.,Lavé J.,France-Lanord C.,et al. Steady erosion rates in the Himalayas through late Cenozoic climatic changes[J],2020,13(6).
APA	Lenard S.J.P.,Lavé J.,France-Lanord C.,Aumaître G.,Bourlès D.L.,&Keddadouche K..(2020).Steady erosion rates in the Himalayas through late Cenozoic climatic changes.Nature Geoscience,13(6).
MLA	Lenard S.J.P.,et al."Steady erosion rates in the Himalayas through late Cenozoic climatic changes".Nature Geoscience 13.6(2020).