Hydrochemical and Isotopic Characteristics of Water in Mamian Pyrite Mining Area and Their Environmental Indication Significance
Deng Xingbin
Huang Shen
Ren Kun
Huang Nanrui
He Guang
Huang Huiji
Zeng Jie
Cheng Ruirui
Pan Xiaodong
Abstract：Acid mine drainage(AMD)can contribute to deterioration of the receiving water quality,accelerate the dissolution of carbonate rocks,leading to the release of CO2,which poses a wide range of hazards.Combined with the hydrogeological setting,hydrochemical and isotopic methods are employed to investigate the sources and migration mechanisms of pollutants in surface and groundwater of the Mamian mining area in Guilin,China.Results show that:(1)the chemical composition of surface water and groundwater mainly came from the weathering of carbonate and silicate rock,as well as the oxidation of sulfide,and Ca-HCO3 was the main water type in the study area,while some sites affected by AMD and domestic sewage wastewater changed to Ca-HCO3·SO4 and Ca·(K+Na)-HCO3 types;(2)sulfur and oxygen isotopes indicate that sulfide,rainwater and sewage were the three main SO42-sources for sampled surface-ground waters;and(3)changes in hydrochemical and isotopic composition indicate that the influence of AMD on surface water and groundwater gradually decreased along the flow directions,affecting to approximately 13.5 km and 1.5 km downstream,respectively.This study not only revealed the negative impact of AMD and human activities on the waters,provided basic data for the protection of water resources for the studied mine area.At the same time,the combination of isotope and water chemistry is proved to be an effective means to study the migration and transformation of pollutants in mining area,which provides a new idea for the study of pollutants in other mining areas.
Keywords：hydrochemistrysulfur and oxygen isotopesacid mine drainagesulfatekarsthydrogeology
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 1531-1544 )