A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry
The Mahanadi delta, deposited on a series of horst and graben basement structures, is considered an extension of the East Lambert Rift of Antarctica. Current study is based on the hydrogeochemical assessment of this deltaic aquifer system and geospatial analysis thereof, to appreciate the basement s...
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doaj-4be073d22ba74231bb711878c6b3ae742020-11-25T02:59:13ZengElsevierGeoscience Frontiers1674-98712020-07-0111414311440A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistryP.P. Das0P.P. Mohapatra1S. Goswami2M. Mishra3J.K. Pattanaik4ACOAST, Amity University Harayana, Gurugram, India; Corresponding author.Department of Geology, North Odisha University, Odisha, IndiaDepartment of Earth Sciences, Sambalpur University, Samabalpur, Odisha, IndiaKhallikote University, Berhampur, Odisha, IndiaCentre for Geography and Geology, Central University of Punjab, Bhatinda, IndiaThe Mahanadi delta, deposited on a series of horst and graben basement structures, is considered an extension of the East Lambert Rift of Antarctica. Current study is based on the hydrogeochemical assessment of this deltaic aquifer system and geospatial analysis thereof, to appreciate the basement structure influence on groundwater chemistry. Major ion chemistry of subsurface waters portrays a distinct saline contamination across the terrain and varied regimes of water types, specifically with respect to southern and northern parts of this aquifer system. Findings of the study indicate a general near surface saline horizon and significant fragmentation of the hydrostatic units. This, in turn, implies noteworthy influence of formational water to salinity regimes and basin structural changes for the escape of these waters to surroundings. A plot of recent low intensity earthquakes displays proximity of epicenters to the faults as well as striking similarity to the trend of terrestrial faults indicating multiple reactivations of the faults. To further corroborate the above findings, spatial pattern analysis of individual hydrochemical variables is carried out which reveals specific clusters of sources (groundwater mixing) and sinks (groundwater dispersion) in proximity to basement fault dispositions. While the faults can be disregarded as conduits or barriers owing to their great depth, the overlying sedimentary mass, particularly, the horizons with significant clayey content have been distorted due to post rift subsidence and fault reactivations. A proximity analysis of ionic clusters points towards a greater influence of longitudinal faults to that of the transverse ones on groundwater mixing or dispersion.http://www.sciencedirect.com/science/article/pii/S1674987120300013HydrogeochemistryMahanadiGeospatialSalinityCluster analysis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
P.P. Das P.P. Mohapatra S. Goswami M. Mishra J.K. Pattanaik |
spellingShingle |
P.P. Das P.P. Mohapatra S. Goswami M. Mishra J.K. Pattanaik A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry Geoscience Frontiers Hydrogeochemistry Mahanadi Geospatial Salinity Cluster analysis |
author_facet |
P.P. Das P.P. Mohapatra S. Goswami M. Mishra J.K. Pattanaik |
author_sort |
P.P. Das |
title |
A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry |
title_short |
A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry |
title_full |
A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry |
title_fullStr |
A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry |
title_full_unstemmed |
A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry |
title_sort |
geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry |
publisher |
Elsevier |
series |
Geoscience Frontiers |
issn |
1674-9871 |
publishDate |
2020-07-01 |
description |
The Mahanadi delta, deposited on a series of horst and graben basement structures, is considered an extension of the East Lambert Rift of Antarctica. Current study is based on the hydrogeochemical assessment of this deltaic aquifer system and geospatial analysis thereof, to appreciate the basement structure influence on groundwater chemistry. Major ion chemistry of subsurface waters portrays a distinct saline contamination across the terrain and varied regimes of water types, specifically with respect to southern and northern parts of this aquifer system. Findings of the study indicate a general near surface saline horizon and significant fragmentation of the hydrostatic units. This, in turn, implies noteworthy influence of formational water to salinity regimes and basin structural changes for the escape of these waters to surroundings. A plot of recent low intensity earthquakes displays proximity of epicenters to the faults as well as striking similarity to the trend of terrestrial faults indicating multiple reactivations of the faults. To further corroborate the above findings, spatial pattern analysis of individual hydrochemical variables is carried out which reveals specific clusters of sources (groundwater mixing) and sinks (groundwater dispersion) in proximity to basement fault dispositions. While the faults can be disregarded as conduits or barriers owing to their great depth, the overlying sedimentary mass, particularly, the horizons with significant clayey content have been distorted due to post rift subsidence and fault reactivations. A proximity analysis of ionic clusters points towards a greater influence of longitudinal faults to that of the transverse ones on groundwater mixing or dispersion. |
topic |
Hydrogeochemistry Mahanadi Geospatial Salinity Cluster analysis |
url |
http://www.sciencedirect.com/science/article/pii/S1674987120300013 |
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