新疆木垒煤田区域地下水补给来源分析

摘要/Abstract

摘要： 查清煤矿区地下水的补给及流动模式是矿区安全开采的重要基础保障之一。通过环境同位素示踪剂（²H和¹⁸O）以及地下水¹⁴C测年技术，识别出新疆木垒煤矿区地下水的补给来源。结果显示：该区中部平原区地下水的主要补给来源为高海拔山区降水，南部地区潜水的平均补给高程约为1 700~2 300 m。¹⁴C测年结果与同位素δ¹⁸O低值表明，第三系碎屑岩类孔隙裂隙水是晚更新世寒冷气候条件下补给形成的；侏罗系孔隙裂隙水、基岩裂隙水与现代潜水之间存在有一定程度的水力联系，地下水的补给流动途径是基岩裂隙水在出山口渗出地表后部分通过山前透水层渗入地下，进而补给潜水及第三系裂隙水或侏罗系孔隙裂隙水。

关键词: 环境同位素, 地下水, 补给来源

Abstract: The coal resources are considerable rich in Mulei region, Xinjiang, China. However, the development of the local coal resources is seriously limited because of the shortage and uneven distribution of water resources. In addition, the water gushing in coal mining process is one of the major threats to the mining safety. Therefore, this paper aims to identify the groundwater recharge sources in Mulei mining area, which is significant for the safety guarantee in mining operations and water suppling. Thirty-three water samples were collected from precipitation, surface water and groundwater in the study area, and by using stable isotopes analysis, water chemistry measurement, radioactive tritium and carbon-14 dating method, the recharge sources were identified and the flow pattern of groundwater was delineated in Mulei mining area, Xinjiang. Oxygen-18 components of the Quaternary unconfined groundwater in the two sides of the boundary line from Dahongliu valley to the middle part of Mingsha mountain had different characteristics; the δ¹⁸O value of groundwater varied from -14.8‰ to -12.8‰ with mean value of -13.9‰ in the west side, and varied from -17.3‰ to 15.4‰ with mean value of -16.1‰ in the east side. This two mean values of δ¹⁸O were 3.2‰ and 5.4‰ lower respectively, than the weighted average δ¹⁸O value of precipitation in Urumqi, indicating that the main recharge source of groundwater in the central area was originated from the higher elevated mountain precipitation, and the recharge elevation was about 1 700-2 300 meters. The low δ¹⁸O value of the Tertiary confined groundwater and the carbon-14 dating results show that the groundwater was recharged under the Late Pleistocene cold climates. Moreover, there was a certain relationship among the Jurassic pore fissure water, the bedrock fissure water and the modern unconfined groundwater; the flow pattern is probably that the bedrock fissure water infiltrated fast into underground through the piedmont permeable layer after seeped from the mountain-pass, and then recharged the fissure water and the Tertiary or Jurassic fissure water. This study is significant for guiding the safety exploitation of mining and security of water supply in Mulei mining area.

Key words: environmental isotopes, groundwater, recharge sources

中图分类号:

P641.8

卫文, 杨振京, 白铭, 陈宗宇. 新疆木垒煤田区域地下水补给来源分析[J]. 干旱区地理, 2016, 39(6): 1230-1237.

WEI Wen, YANG Zhen-jing, BAI Ming, CHEN Zong-yu. Application of environmental isotopes to identify recharge sources of groundwater in Mulei mining area, Xinjiang[J]. , 2016, 39(6): 1230-1237.

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