Using 87Sr/86Sr, δ18O and δ2H isotopes along with major chemical composition to assess groundwater salinization in lower Shire valley, Malawi

被引：20
|
作者：
Monjerezi, Maurice [1 ,3 ]
Vogt, Rolf D. [1 ]
Aagaard, Per [2 ]
Gebru, Asfaw Gebretsadik [1 ]
Saka, John D. K. [3 ]
机构：
[1] Univ Oslo, Dept Chem, N-0315 Oslo, Norway
[2] Univ Oslo, Dept Geosci, N-0315 Oslo, Norway
[3] Univ Malawi, Chancellor Coll, Dept Chem, Zomba, Malawi
来源：
APPLIED GEOCHEMISTRY | 2011年 / 26卷 / 12期
关键词：
MODELING STREAMWATER CHEMISTRY; SOILWATER END-MEMBERS; STRONTIUM ISOTOPES; SALINE GROUNDWATER; MURRAY BASIN; FLOW PATHS; WATER; EVOLUTION; AQUIFER; AUSTRALIA;
D O I：
10.1016/j.apgeochem.2011.08.003
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Groundwater resources in some parts of the lower section of Shire River valley, Malawi, are not useable for rural domestic water supply due to high salinity. In this study, a combined assessment of isotopic (Sr-87/Sr-86, delta O-18 and delta H-2) and major ion composition was conducted in order to identify the hydro-geochemical evolution of the groundwater and thereby the causes of salinity. Three major end-members (representing fresh-and saline groundwater, and evaporated recharge) were identified based on major ion and isotopic composition. The saline groundwater is inferred to result from dissolution of evaporitic salts (halite) and the fresh groundwater shows influence of silicate weathering. Conservative mixing models show that brackish groundwater samples result from a three component mixture comprising the identified end-members. Hence their salinity is interpreted to result from mixing of fresh groundwater with evaporated recharge and saline groundwater. On the other hand, the groundwater with low TDS, found at some distance from areas of high salinity, is influenced by mixing of evaporated recharge and fresh groundwater only. Close to the Shire marshes, where there is shallow groundwater, composition of stable isotopes of water indicates that evaporation may also be an important factor. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2201 / 2214
页数：14
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