干旱区生态环境知识资源中心(Arid): Flash floods controlling Cu, Pb, As and Hg variations in fluvial sediments of a river impacted by metal mining in the Atacama Desert

Arid

DOI	10.1016/j.jsames.2021.103290
	Flash floods controlling Cu, Pb, As and Hg variations in fluvial sediments of a river impacted by metal mining in the Atacama Desert
	Aguilar, German; Valdes, Ana; Cabre, Albert; Galdames, Fernando
通讯作者	Aguilar, G (corresponding author), Univ Chile, Fac Ciencias Fis & Maternat, Adv Min Technol Ctr, Ave Tupper 2007, Santiago, Chile.
来源期刊	JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN	0895-9811
EISSN	1873-0647
出版年	2021
卷号	109
英文摘要	Solid mine wastes can be dispersed in river systems by fluvial processes contaminating distant areas. This process has been previously reported in rivers of the Atacama Desert impacted by mining. The removal of waste in these rivers is a complex environmental scenario that involves (i) mining operation plans, (ii) the spatio-temporal variability of precipitation events and, (iii) the sediment-transport pathways within the drainage network. This work presents how flash floods triggered by extreme storm events determine the redistribution and the variation of elemental concentrations of the suspended load fraction in a river with several historical and actual mine wastes situated in the Atacama Desert. The concentrations of Cu, Pb, As and Hg measured in two sampling stations of a mining segment of the Copiap ' o River after flash floods are lower compared to the concentrations measured in the period before these hydrometeorological events. However, the concentrations of these metals and metalloids increased in areas distant from the mine clusters, where the values observed before the flash floods were lower. The redistributions of the element concentrations can be explained by the occurrence of two major flood events triggered by the extreme storm events of March 2015 and May 2017. The combination of the element concentrations with calculated geo-accumulation indexes shows the potential source of geochemical anomalies for these elements. Cu and Hg anomalies are induced by historical mining activities in the Copiapo ' River while Pb and As concentrations agree with the regional background. Some Pb and As anomalies would be associated with the geology of the zone where the main cluster of mine exploitations are present. The fact that flash floods result in Cu, Pb, As and Hg concentrations in sediment load more in line with the local background, suggests that this type of hydrometeorological events probably represent the natural processes of geochemical recovery of arid river impacted by metal mining.
英文关键词	Flash floods Atacama desert Metal mining Fluvial sediments Mine tailings Cu-Pb-AS-Hg concentrations Copiapo river
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000670265900001
WOS关键词	EROSION ; CHILE ; CONTAMINATION ; ENRICHMENT ; DYNAMICS ; COPIAPO ; MERCURY ; COPPER ; TIME
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351007
作者单位	[Aguilar, German; Cabre, Albert] Univ Chile, Fac Ciencias Fis & Maternat, Adv Min Technol Ctr, Ave Tupper 2007, Santiago, Chile; [Valdes, Ana] Minist Energia, Dept Tecnol Nucl, Div Invest & Aplicac Nucl, Comis Chilena Energia Nucl, Santiago 12501, Chile; [Cabre, Albert] Univ Catolica Norte, Fac Ingn & Geol, Dept Ciencias Geol, Ave Angamos 0610, Antofagasta, Chile; [Galdames, Fernando] Univ Chile, Dept Geol, Fac Ciencias Fis & Matemat, Plaza Ercilla 803, Santiago, Chile
推荐引用方式 GB/T 7714	Aguilar, German,Valdes, Ana,Cabre, Albert,et al. Flash floods controlling Cu, Pb, As and Hg variations in fluvial sediments of a river impacted by metal mining in the Atacama Desert[J],2021,109.
APA	Aguilar, German,Valdes, Ana,Cabre, Albert,&Galdames, Fernando.(2021).Flash floods controlling Cu, Pb, As and Hg variations in fluvial sediments of a river impacted by metal mining in the Atacama Desert.JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,109.
MLA	Aguilar, German,et al."Flash floods controlling Cu, Pb, As and Hg variations in fluvial sediments of a river impacted by metal mining in the Atacama Desert".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 109(2021).