Arid
DOI10.1016/j.gexplo.2017.01.005
Recharge, groundwater flow pattern and contamination processes in an arid volcanic area: Insights from isotopic and geochemical tracers (Bara aquifer system, Republic of Djibouti)
Awaleh, Mohamed Osman1; Baudron, Paul2,3,4; Soubaneh, Youssouf Djibril5; Boschetti, Tiziano6; Hoch, Farhan Bouraleh1; Egueh, Nima Moussa1; Mohamed, Jalludin1; Dabar, Omar Assowe1; Masse-Dufresne, Janie2; Gassani, Jean1
通讯作者Awaleh, Mohamed Osman
来源期刊JOURNAL OF GEOCHEMICAL EXPLORATION
ISSN0375-6742
EISSN1879-1689
出版年2017
卷号175页码:82-98
英文摘要

Fractured volcanic aquifers are the main water resources in the arid climate of the Republic of Djibouti. Nonetheless, these strategic reservoirs are overexploited and their comprehensive understanding is therefore a pre-requisite for a sustainable use. A geochemical and isotopic survey, including major ion chemistry, H-2, O-18, C-13, H-3, Sr-82/Sr-86, N-15 was performed and combined with existing C-14 data to study recharge, contamination processes and groundwater flow patterns inside and between the compartments of a complex aquifer system composed by basaltic rocks and by alluvium located in Petit Bara, Grand Bara, and Mouloud areas (Southwest of Djibouti). A main feature was the common trend from a fresh Na-Cl-HCO3 water type (alluvium groundwaters) to an intermediate water type (alluvium and basalt groundwaters) and finally to a Na-Cl-SO4 water type (most mineralized basalt groundwater). Elementary and isotopic nitrate evidenced and located anthropogenic and geogenic origins of nitrate. Alluvium groundwaters had delta H-2 and delta O-18 signature of modern precipitation while basalt groundwaters were significantly depleted and enriched in delta C-13 due to water-rock interactions. Modern radiocarbon and tritium were evidenced in the alluvium groundwaters, While recalculated radiocarbon ages located recharge of the basalt groundwaters in the early to mid-Holocene. These features revealed a common evolutionary pattern, with a recharge from wadi-rivers to the alluvium and a downward circulation to the basalt through major faults, combined with a mixing with a more geochemically evolved groundwater. Accordingly, highly saline groundwater at the outlet of the Petit Bara plain was found to be diluted by modern recharge in the alluvium. Two major basaltic aquifer compartments were found to be connected (Grand Bara and Mouloud), revealing a global northeastward flowpath below the endorheic Grand Bara plain. (C) 2017 Elsevier B.V. All rights reserved.


英文关键词Djibouti Hydrochemistry Volcanic aquifer Stable isotopes Nitrogen isotopes
类型Article
语种英语
国家Djibouti ; Canada ; France ; Italy
收录类别SCI-E
WOS记录号WOS:000394472600008
WOS关键词MAIN ETHIOPIAN RIFT ; GEOTHERMAL-FIELD ; MANTLE SOURCES ; AFAR RIFT ; NITRATE ; ORIGIN ; HYDROCHEMISTRY ; SR-87/SR-86 ; EVOLUTION ; ASAL
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/200460
作者单位1.CERD, Inst Sci Terre, Route Aeroport,BP 486, Djibouti Ville, Djibouti;
2.Polytech Montreal, Dept Genies Civil Geol & Mines, CP 6079,Succ Ctr Vile, Montreal, PQ H3C 3A, Canada;
3.UMR G EAU, BP 5095, F-34196 Montpellier 5, France;
4.GEOTOP Res Ctr, Montreal, PQ, Canada;
5.Univ Quebec, Dept Biol Chim & Geog, 300 Allee Ursulines, Rimouski, PQ G5L 3A1, Canada;
6.Univ Parma, Dept Phys & Earth Sci Macedonio Melloni, Parco Area Sci 157-A, I-43124 Parma, Italy
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GB/T 7714
Awaleh, Mohamed Osman,Baudron, Paul,Soubaneh, Youssouf Djibril,et al. Recharge, groundwater flow pattern and contamination processes in an arid volcanic area: Insights from isotopic and geochemical tracers (Bara aquifer system, Republic of Djibouti)[J],2017,175:82-98.
APA Awaleh, Mohamed Osman.,Baudron, Paul.,Soubaneh, Youssouf Djibril.,Boschetti, Tiziano.,Hoch, Farhan Bouraleh.,...&Gassani, Jean.(2017).Recharge, groundwater flow pattern and contamination processes in an arid volcanic area: Insights from isotopic and geochemical tracers (Bara aquifer system, Republic of Djibouti).JOURNAL OF GEOCHEMICAL EXPLORATION,175,82-98.
MLA Awaleh, Mohamed Osman,et al."Recharge, groundwater flow pattern and contamination processes in an arid volcanic area: Insights from isotopic and geochemical tracers (Bara aquifer system, Republic of Djibouti)".JOURNAL OF GEOCHEMICAL EXPLORATION 175(2017):82-98.
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