Hydrogeochemistry, contaminant transport and tectonic effects in the Okposi-Uburu salt lake area of Imo State, Nigeria
作者:
BONIFACEC. E. EGBOKA,
KALUO. UMA,
期刊:
Hydrological Sciences Journal
(Taylor Available online 1986)
卷期:
Volume 31,
issue 2
页码: 205-221
ISSN:0262-6667
年代: 1986
DOI:10.1080/02626668609491040
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Hydrogeochemical data of groundwater samples from 35 boreholes drilled in the Okposi-Uburu salt lake area are analysed. The data reveal that concentrations of dissolved geochemical constituents such as calcium (Ca2+), manganese (Mn2+), magnesium (Mg2+), chloride (C1−), and sulphate (SO2+4) ions show significant areal variations. Dissolved solids, chloride and manganese ions have concentrations up to and above the objectionable limits for drinking water in the salt lake area. Concentrations of dissolved solids in this zone are about 1200 mg 1−1. Concentrations of chloride and manganese ions are 350 mg 1−1and 1.0 mg 1−1respectively. These geochemical constituents and groundwater flow patterns show that transport of contaminants away from the source zone has been greatly influenced by advection, while in areas of high velocity dispersion is the controlling factor. Temperatures for the Okposi and Uburu salt springs are 34.4 and 37.5°C respectively. Bomb tritium indicated water of pre-1953 age. Deuterium and oxygen-18 showed high isotopic enrichment. The high concentrations of dissolved salts resulted from the combined effects of migration of dissolved salts through fractures at the lake floor and evaporation from the lake surface. These findings are related to the tectonic history of the Okposi-Uburu area.
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