NDLI: Role of shallow alluvial stratigraphy and Holocene geomorphology on groundwater arsenic contamination in the Middle Ganga Plain, India

Content Provider	Springer Nature Link
Author	Sahu, Sudarsan Saha, Dipankar
Copyright Year	2014
Abstract	Floodplain geomorphology and Late Quaternary alluvial stratigraphy influence groundwater arsenic contamination in the Gangetic Plains in India. Elevated concentrations of arsenic (>50 µg/L) in the Middle Ganga Plain (MGP) are spatially related with dark grey to black coloured organic-rich clay sediments found both in the Active (AFP, T$_{0}$-surface) and Older Floodplains (OFP, T$_{1}$-surface) of the Ganga River. The floodplains comprise Newer Alluvium of Holocene age, mainly derived from Himalaya. Abandoned/palaeochannel cut-offs, either filled (often in OFP) or in the process of filling under fluvio-lacustrine environments (often in AFP) host such clay deposits. The settlements on anthropogenic fills (to avoid flood inundation) over such palaeochannels exhibit higher concentrations of arsenic in groundwater (max. 987 µg/L). The organic carbon from the clay bodies when released to groundwater promotes reducing environment that causes release of arsenic entrapped in the sediments. The sandy areas, such as scroll bar ridges, levees and point bar platforms, exhibit low concentrations of arsenic. The model on groundwater arsenic distribution and Holocene geomorphic units can be used for micro-level delineation of arsenic-free shallow aquifers for rural water supply in the arsenic-contaminated areas.
Starting Page	3523
Ending Page	3536
Page Count	14
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	7
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-09-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater Arsenic contamination Gangetic Plains India Quaternary geology Geomorphology Organic carbon Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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