干旱区生态环境知识资源中心(Arid): Assessment of geochemical processes in the shared groundwater resources of the Taoudeni aquifer system (Sahel region, Africa)

Arid

DOI	10.1007/s10040-023-02688-5
	Assessment of geochemical processes in the shared groundwater resources of the Taoudeni aquifer system (Sahel region, Africa)
	Trabelsi, Rim; Zouari, Kamel; Araguas, Luis J. Araguas; Moulla, Adnane S.; Sidibe, Aboubacar M.; Bacar, Teis
通讯作者	Trabelsi, R
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
出版年	2024
卷号	32 期号:1 页码:167-188
英文摘要	The Taoudeni basin occupies a large portion of the West African Craton in Mauritania, Mali, SW Burkina Faso, and Algeria. The multi-layer Taoudeni aquifer system (TAS) occurs in geological formations extending in age from the Infra-Cambrian to the Quaternary. These groundwater resources support local livelihoods, maintain vital ecosystems, and strongly affect terrestrial water and energy budgets in the region. Hydrogeochemical and stable (d(2)H, d(13)C, d(18)O) and radioactive (H-3, C-14) isotope analyses were carried out with the aim of identifying the major geochemical processes controlling groundwater quality and the recharge mechanisms. The analyzed groundwater samples showed a wide range of chemical compositions based on major ions, with limited variability, regardless of the aquifer lithology or stratigraphy. The predominant water type, Mg-Ca-HCO3, was found in most geological and hydrogeological settings. A principal component analysis of the hydrochemical data revealed the two major processes governing the geochemistry of groundwaters in the TAS. These are water-rock interaction (leaching, weathering, ion exchange) and anthropogenic contamination. Environmental isotopes revealed the presence of groundwaters with heterogeneous signatures, reflecting different recharge processes and varying groundwater ages. A widespread present-day recharge by direct infiltration of rainwater and/or by surface water was highlighted by significant tritium levels in most wells and high C-14 activities occurring mainly in shallow aquifers. However, isotopically depleted d(18)O contents with low C-14 activities were found in the confined part of the Continental Intercalaire aquifer, particularly in the Algerian part, indicating the presence of fossil groundwater, recharged under colder past climatic conditions.
英文关键词	Arid regions Isotopes Water-rock interaction Groundwater contamination Africa
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001063879400001
WOS关键词	MULTIVARIATE STATISTICAL-ANALYSIS ; CONTINENTAL INTERCALAIRE AQUIFER ; WATER-QUALITY ; HYDROGEOCHEMICAL PROCESSES ; ISOTOPIC COMPOSITION ; BASIN ; EVOLUTION ; IDENTIFICATION ; TIME ; AREA
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404089
推荐引用方式 GB/T 7714	Trabelsi, Rim,Zouari, Kamel,Araguas, Luis J. Araguas,et al. Assessment of geochemical processes in the shared groundwater resources of the Taoudeni aquifer system (Sahel region, Africa)[J],2024,32(1):167-188.
APA	Trabelsi, Rim,Zouari, Kamel,Araguas, Luis J. Araguas,Moulla, Adnane S.,Sidibe, Aboubacar M.,&Bacar, Teis.(2024).Assessment of geochemical processes in the shared groundwater resources of the Taoudeni aquifer system (Sahel region, Africa).HYDROGEOLOGY JOURNAL,32(1),167-188.
MLA	Trabelsi, Rim,et al."Assessment of geochemical processes in the shared groundwater resources of the Taoudeni aquifer system (Sahel region, Africa)".HYDROGEOLOGY JOURNAL 32.1(2024):167-188.