E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||4|
|Section||Water-Rock Interaction Controlling Water Quality and Human Health Issues|
|Published online||07 June 2019|
The provenance of deep groundwater and its relation to arsenic distribution in the northwestern Hetao Basin, Inner Mongolia
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, P.R. China
2 School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, P.R. China
3 The National Institute of Metrology, Beijing 100013, PR China
* Corresponding author: email@example.com.
High arsenic (As) groundwater has been found in deep aquifer of the northwestern Hetao Basin. Little is known about the source of high As deep groundwater and its role in As distribution. Based on strontium (Sr) isotopes, this study aims to investigate the provenance of high arsenic deep groundwater (DGW). 87Sr/86Sr in DGW gradually decreased from the alluvial fans to the flat plain. Results show that fissure water, plagioclase dissolution, and shallow groundwater (SGW) controlled the 87Sr/86Sr variation. Although the reductive dissolution of As-containing iron oxide controlled the As mobilization, the leaching of phyllite and meta-basalt, incongruent dissolution of plagioclase, and vertical mixing with SGW also played an important role in increasing As concentrations in DGW approximately along the flow paths.
© The Authors, published by EDP Sciences, 2019
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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