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引用本文:陈松,桂和荣. 淮北煤田太原组灰岩水年龄及同位素地球化学特征[J]. 中国地质, 2019, 46(2): 337-345.
CHEN Song,GUI Herong. The age and isotopic characteristics of groundwater in Taiyuan Formation limestone aquifer of the Huaibei coalfield[J]. Geology in China, 2019, 46(2): 337-345(in Chinese with English abstract).
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淮北煤田太原组灰岩水年龄及同位素地球化学特征
陈松1,2, 桂和荣1,2
1.宿州学院 资源与土木工程学院, 安徽 宿州 234000;2.国家煤矿水害防治工程技术研究中心, 安徽 宿州 234000
摘要:
为了解淮北煤田太原组灰岩水年龄、水化学特征及演化,采集了淮北煤田29个矿井地下水样品进行水常规、氢氧同位素及14C测试。利用传统图示及统计方法探讨了地下水化学特征及演化,约束了地下水年龄及径流特征。结果表明:淮北煤田太原组灰岩水年龄在2900~21910 a之间变化,不同矿区之间灰岩水化学特征有明显差异。闸河矿区以较低的TDS浓度、最小的地下水年龄和最高的δD和δ18O值为特征,为淮北煤田太原组灰岩水主要的补给区;临涣矿区孙疃矿、宿县矿区桃园矿具有较大的地下水年龄、较高的TDS浓度和低的δD和δ18O值,为主要排泄区。TDS浓度等值线图和地下水年龄等值线图呈现一致的演化规律,淮北煤田东北部闸河矿区为主要补给区。太原组灰岩水径流特征主要受构造背景的控制,地下水补给条件及水岩相互作用程度决定了水体中TDS浓度和氢氧同位素富集特征。
关键词:  地下水年龄  14C  太原组  灰岩水  淮北煤田
DOI:10.12029/gc20190210
分类号:P641
基金项目:国家自然科学基金项目(41373095)、安徽省自然科学基金(1708085QE125)、安徽高校自然科学研究项目(KJ2018A0450)和安徽省博士后研究项目(2016B093)共同资助。
The age and isotopic characteristics of groundwater in Taiyuan Formation limestone aquifer of the Huaibei coalfield
CHEN Song1,2, GUI Herong1,2
1.School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, Anhui, China;2.National Engineering Research Center of Coal Mine Water Hazard Controlling, Suzhou 234000, Anhui, China
Abstract:
For the purpose of understanding the age, hydrochemical characteristics and evolution of groundwater in Taiyuan Formation limestone aquifer in the Huaibei coalfield, twenty nine groundwater samples were collected from the Huaibei coalfield, and concentrations of major ions, hydrogen and oxygen isotopes and 14C radio isotopes were analyzed. The traditional graphic and statistical methods were used to discuss the evolution of groundwater and hydrochemical characteristics as well as the age and runoff characteristics of groundwater. Some conclusions have been reached:the ages of groundwater samples in Taiyuan Formation limestone aquifer vary from 2900a to 21920a, the hydrochemical characteristics of groundwater are different in different mining areas. The groundwater samples in the Zhahe mining area have lower TDS concentrations, the minimum age and the highest values of δD and δ18O, and hence this area could be regarded as the recharge area in the Huaibei coalfield. The groundwater samples in the Suntuan mine and Taoyuan mine have largest age, higher concentrations of TDS and lower δD and δ18O values, and such areas could be considered to be the drainage areas. The contour diagrams about TDS concentrations and groundwater age show consistent patterns, suggesting that the main recharge area of groundwater in Taiyuan Formation limestone aquifers lies in the northeast area of the Huaibei coalfield. The groundwater runoff characteristics in Taiyuan Formation are mainly controlled by the tectonic setting, and the recharge conditions and water-rock interaction degrees of groundwater are main factors for the concentrations of TDS and hydrogen and oxygen isotopes.
Key words:  groundwater age  14C  Taiyuan Formation  limestone groundwater  Huaibei coalfield