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DOI	10.1016/j.earscirev.2019.103039
	Weathering indices as climate proxies. A step forward based on Congo and SW African river muds
	Dinis P.A.; Garzanti E.; Hahn A.; Vermeesch P.; Cabral-Pinto M.
发表日期	2020
ISSN	0012-8815
卷号	201
英文摘要	Despite the influence of other geological and geomorphological factors, chemical weathering at the Earth's surface is strongly controlled by climate. Thus, a measure of weathering intensity determined from soils or sediments should provide information about the climatic conditions associated with their formation. Available geochemical and mineralogical data on modern fluvial and marine muds from different regions of southern Africa and its Atlantic continental margin are used to review the links between sediment composition and climatic properties together with the possible causes of variance. Although river muds may not be generated exclusively in a single sedimentary cycle and erosion and weathering processes do not necessarily take place in a spatially homogeneous way, significant relationships between mineralogical and geochemical signatures of river mud and rainfall in the corresponding catchment area were recognised. Our study shows that the composition of clay is strongly influenced by climatically-driven weathering, whilst coarser mud fractions tend to be more affected by provenance, grain size, hydraulic sorting, and recycling. In the marine environment the climatic signal may be lost even in clay, because of hydraulic fractionation, authigenic mineral growth and mixing with foreign particles. Given the ubiquitous character of fluvial muds, and the easy and non-expensive methods available for separating and analysing clay fractions, their geochemical fingerprints represent a most precious source of information concerning climate. Any geochemical parameter used as a regional proxy of climate, however, still requires that the diversity of geological, geomorphological, and biological factors that affect its value are cautiously considered. © 2019 Elsevier B.V.
英文关键词	Chemical weathering; Climate; Congo; Mud composition; Rainfall proxies; SW African margin
语种	英语
scopus关键词	catchment; chemical weathering; climatology; continental margin; fluvial deposit; formation mechanism; geomorphological response; marine sediment; mineralogy; mud; rainfall; sediment chemistry; Congo River
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209744
作者单位	MARE – Marine and Environmental Sciences Centre, Department of Earth Sciences, University of Coimbra, Coimbra, 3030-790, Portugal; Laboratory for Provenance Studies, Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milano, 20126, Italy; MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; University College London, London, WC1E 6BT, United Kingdom; Geobiotec Research Centre, Department of Geosciences of University of Aveiro, Aveiro, 3810-193, Portugal
推荐引用方式 GB/T 7714	Dinis P.A.,Garzanti E.,Hahn A.,et al. Weathering indices as climate proxies. A step forward based on Congo and SW African river muds[J],2020,201.
APA	Dinis P.A.,Garzanti E.,Hahn A.,Vermeesch P.,&Cabral-Pinto M..(2020).Weathering indices as climate proxies. A step forward based on Congo and SW African river muds.EARTH-SCIENCE REVIEWS,201.
MLA	Dinis P.A.,et al."Weathering indices as climate proxies. A step forward based on Congo and SW African river muds".EARTH-SCIENCE REVIEWS 201(2020).