Hydrochemical and hydrogen and oxygen isotope characteristics of subsurface water in the Maqu Plateau

WANG Zhen; GUO Huaming; LIU Haiyan; ZHAO Weiguang; LIU Shuai; WANG Jiao; SHEN Mengmeng

doi:10.16030/j.cnki.issn.1000-3665.201912013

2021 Vol. 48, No. 1

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WANG Zhen, GUO Huaming, LIU Haiyan, ZHAO Weiguang, LIU Shuai, WANG Jiao, SHEN Mengmeng. Hydrochemical and hydrogen and oxygen isotope characteristics of subsurface water in the Maqu Plateau[J]. Hydrogeology & Engineering Geology, 2021, 48(1): 18-26. doi: 10.16030/j.cnki.issn.1000-3665.201912013

Citation:

WANG Zhen, GUO Huaming, LIU Haiyan, ZHAO Weiguang, LIU Shuai, WANG Jiao, SHEN Mengmeng. Hydrochemical and hydrogen and oxygen isotope characteristics of subsurface water in the Maqu Plateau[J]. Hydrogeology & Engineering Geology, 2021, 48(1): 18-26. doi: 10.16030/j.cnki.issn.1000-3665.201912013

Hydrochemical and hydrogen and oxygen isotope characteristics of subsurface water in the Maqu Plateau

1.
School of Water Resources and Environment Engineering, East China University of Technology, Nanchang, Jiangxi　330032, China
2.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, Jiangxi　330013, China
3.
School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing　100083, China

More Information

Corresponding author: GUO Huaming, hmguo@cugb.edu.cn

Received Date: 25 December 2019

Revised Date: 15 April 2020

Publish Date: 15 January 2021

Abstract

Abstract

Groundwater is an important source of recharge to the Yellow River in the area of the Maqu Plateau, but little is known about the groundwater hydrochemical characteristics and the formation mechanism. Phreatic water samples, surface water samples and sediment samples were collected from the study area to investigate their hydrochemical and isotopic characteristics and hydrogeochemical processes. The results show that river water and phreatic water samples have low salinity with Ca²⁺ and ${\rm{HCO}}_3^- $ being the main constituents (TDS of 72−195 mg/L and 207−459 mg/L, respectively). Concentration of arsenic (As) in water samples range from 0.46 μg/L to 17.7 μg/L. The plot of hydrogen and oxygen isotopes shows that the phreatic water and surface water are mainly recharged from local meteoric water. The river water is relatively enriched in¹⁸O and D relative to the phreatic water. The hydrochemistry of the river water are mainly influenced by evaporation, while the phreatic water is mainly influenced by rock weathering involving dissolution of carbonates. Saturation index of dolomite (SI_dolomite) in 68% phreatic water samples is below zero, indicating that the phreatic water is unsaturated with respect to dolomite. As in the groundwater are possibly the result of reductive dissolution of iron-manganese oxide minerals in the unconfined aquifer sediments, which may be sourced from adsorbed As forms in the iron-manganese oxide minerals. This study is helpful in revealing the source of shallow groundwater and genesis mechanisms of groundwater chemicals in the upper stream of the Yellow River.
- the Yellow River catchment areas /
- Maqu Plateau /
- stable isotopes /
- water-rock interactions /
- aquifer

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