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Anandhan, P.
- A Study on Variation in Ionic Composition of Aqueous System in Different Lithounits around Perambalur Region, Tamil Nadu
Abstract Views :207 |
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Authors
S. Chidambaram
1,
V. Vijayakumar
1,
K. Srinivasamoorthy
1,
P. Anandhan
1,
M. V. Prasanna
1,
S. Vasudevan
1
Affiliations
1 Department of Earth Sciences, Annamalai University, Annamalai Nagar - 608 002, IN
1 Department of Earth Sciences, Annamalai University, Annamalai Nagar - 608 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 6 (2007), Pagination: 1061-1069Abstract
Hydrogeochemistry of a region is a reflection of the hydrodynamic processes, Lithological composition and physical constraints. Case study has been carried out in a varied lithologica] terrain with Archaean, Gondwana and Cretaceous rocks to unravel the hydrogeochemical process. The study area is around Perambalur region lying between Latitudes 11°O8OO" - ll°31OO" and Longitudes 78°35'00" - 78°5950" Pco2 values of water samples show wide variation in lithology, reflecting higher saturation index in carbonate minerals Mixing of water was witnessed in the Cretaceous formation Release of bicarbonate ions into the system is mainly derived from weathering of carbonate minerals reflecting lesser significance of silicate weathering. Thermodynamic equilibrium plot shows grouping of samples in the Kaolinite field with seasonal variation Saturation index (SI) for carbonate minerals is higher than silicate minerals Dilutions of samples are noted in the Archaean formation during Post-Monsoon season and migration of SI plume of carbonate minerals is towards southeast during Post-Monsoon season Geochemical reactions determining the water chemistry of the study area are also obtained by statistical analysis.Keywords
Hydrogeochemistry, Lithological Differentiation, Saturation Index, Perambalur Area, Tamil Nadu.- Characterisation of Groundwater Chemistry in an Eastern Coastal Area of Cuddalore District, Tamil Nadu
Abstract Views :323 |
PDF Views:4
Authors
Affiliations
1 Department of Earth Sciences, Pondicherry University, Puducherry – 605 104, IN
2 Department of Earth Sciences, Annamalai University, Annamalainagar – 608 002, IN
3 National Geophysical Research Institute, Hyderabad -500 007, IN
1 Department of Earth Sciences, Pondicherry University, Puducherry – 605 104, IN
2 Department of Earth Sciences, Annamalai University, Annamalainagar – 608 002, IN
3 National Geophysical Research Institute, Hyderabad -500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 6 (2011), Pagination: 549-558Abstract
The groundwater quality detoriation due to various geochemical processes like saline water intrusion, evaporation and interaction of groundwater with brines is a serious problem in coastal environments. Understanding the geochemical evolution is important for sustainable development of water resources. A detailed investigation was carried out to evaluate the geochemical processes regulating groundwater quality in Cuddalore district of Tamilnadu, India. The area is entirely underlined by sedimentary formations, which include sandstone, clay, alluvium, and small patches of laterite soils of tertiary and quaternary age. Groundwater samples were collected from the study area and analyzed for major ions. The electrical conductivity (EC) value ranged from 962 to 11,824 μS/cm, with a mean of 2802 μS/cm. The hydrogeochemical evolution of groundwater in the study area starts from Mg-HCO3 type to Na-Cl type indicating the cation exchange reaction along with seawater intrusion. The Br/Cl ratio indicates the evaporation source for the ion. The Na/Cl ratios indicate groundwater is probably controlled by water-rock interaction, most likely by derived from the weathering of calcium-magnesium silicates. The plot of (Ca+Mg) versus HCO3 suggests ions derived from sediment weathering. The plot of Na+K over Cl reflects silicate weathering along with precipitation. Gibbs plot indicates the dominant control of rock weathering. Factor analysis indicates dominance of salt water intrusion, cation-exchange and anthropogenic phenomenon in the study.Keywords
Groundwater, Geochemical Facies, Ionic Ratios, Factor Analysis, Cuddalore, Tamil Nadu.References
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