Regional characteristics of groundwater sulfate source and evolution in the multi-layer aquifer system of the northern Shaanxi coal mine base, northwestern China: Evidence from geochemical and isotopic fingerprints

被引：1

作者：

Qu, Shen ^{[1
]}

Wang, Chenyu ^{[2
]}

Liang, Xiangyang ^{[3
]}

Luo, Ankun ^{[2
,3
]}

Shi, Zheming ^{[2
]}

Wang, Guangcai ^{[2
]}

Yu, Ruihong ^{[1
]}

机构：

[1] Inner Mongolia Univ, Sch Ecol & Environm, Inner Mongolia Key Lab River & Lake Ecol, Hohhot 010021, Peoples R China

[2] China Univ Geosci, Key Lab Groundwater Circulat & Environm Evolut, MOE, Beijing 100083, Peoples R China

[3] China Coal Technol & Engn Grp Corp, Xian Res Inst, Xian 710054, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2024年 / 480卷

基金：

中国国家自然科学基金;

关键词：

Groundwater sulfate; Stable isotope; MixSiar model; Regional characteristics; Shenfuyu Coalfield; DISSOLVED SULFATE; RIVER; SULFUR; ORIGIN; AREA; IDENTIFICATION; FRACTIONATION; CHEMISTRY; DRAINAGE; QUALITY;

D O I：

10.1016/j.jhazmat.2024.135866

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Groundwater sulfate contamination in mining areas has attracted widespread attention. However, deciphering the source and evolution of sulfate in large-scale mining areas remains a challenge due to intense anthropogenic influences and complex hydrogeological conditions. In this study, 94 groundwater samples were analyzed by a combination of self-organizing maps, MixSiar model, multi-isotope analyses (delta S-34, delta(OSO4)-O-18, SD and S18Owater) and hydrogeochemical methods to investigate the regional characteristics of groundwater sulfate source and evolution in China's largest coalfield (the Shenfuyu Coalfield). The results showed that the source and evolution of groundwater sulfate were controlled by human activities (mining and agricultural activities) and hydrogeological conditions. The groundwater sulfate primarily originated from pyrite oxidation, gypsum dissolution and human inputs. For the mining districts with shallow mining depths, pyrite oxidation and fertilizer contributed to groundwater sulfate. In addition, the ground cracks and abandoned mines controlled the BSR and pyrite oxidation processes. In contrast, the gypsum dissolution and cation exchange dominated the sulfate evolution in the mining districts with deep mining depths due to slow groundwater circulation. This study provided new insights into the source and evolution of groundwater sulfate in large coalfields, as well as references for regional water resource utilization and protection.

引用

页数：13