INDICATION OF ENVIRONMENTAL ISOTOPES IN IDENTIFYING THE GROUNDWATER RECHARGE SOURCES IN ILI RIVER VALLEY
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摘要:
重点分析了研究区潜水、浅层承压水、泉水及地表水δD、δ18O的分布特征, 并对5组水文钻探井地下水样品进行分析. 潜水δD变化范围为-97.32‰~-67.51‰, 平均值为-80.34‰; δ18O为-15.85‰~-10.66‰, 平均值为-12.08‰. 浅层承压水δD为-111.93‰~-68.38‰, 平均值为-84.79‰; δ18O为-16.01‰~-10.52‰, 平均值为-12.30‰. 泉水δD为-102.06‰~-71.63‰, 平均值为-84.10‰; δ18O为-14.21‰~-9.70‰, 平均值为-12.24‰. 地表水δD为-90.53‰~-60.99‰, 平均值为-72.58‰; δ18O在-13.20‰~-9.54‰, 平均值为-11.21‰. 地下水δ13C为-9.4‰~-5.6‰, 平均值为-8.3‰, 极差为3.8‰. 结果表明: 地下水与地表水均起源于当地大气降水. 潜水与浅层承压水水力联系较强, 潜水与浅层承压水属于同一含水系统. 与浅层承压水相比, 深层承压水年龄较大, 在20 ka左右, 属于沉积埋藏水. 深层承压水与浅层承压水的水力联系较弱. 潜水与浅层承压水的δ13C值较为接近, 且接近大气CO2的δ13C值-7‰. 研究区地下水中碳的主要来源为大气CO2.
Abstract:This study analyzes the distribution characteristics of δD and δ18O in phreatic water, shallow confined water, spring water and surface water, as well as the δ13C of five groups of groundwater samples from hydrologic drilling wells. The results show that both groundwater and surface water originate from the local meteoric water. The phreatic water and shallow confined water, belonging to the same aquifer system, have a strong hydraulic connection. The age of deep confined water is about 20 ka, older than the shallow confined water, belonging to sedimentary buried water, with weak hydraulic relation between the two. The δ13C values of phreatic water and shallow confined water are close to each other, approximating that of atmospheric CO2(-7‰) which serves as the main source of carbon in groundwater of the study area.
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Key words:
- environmental isotope /
- aquifer system /
- δD-δ18O relation /
- δ13C /
- Ili River Valley /
- Xinjiang
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表 1 氢氧稳定同位素参数统计特征值表
Table 1. Statistical eigenvalues of hydrogen and oxygen stable isotope parameters
特征值 潜水 浅层承压水 泉水 地表水 δD δ18O δD δ18O δD δ18O δD δ18O 最大值 -67.51 -10.66 -68.38 -10.52 -71.63 -9.70 -60.99 -9.54 最小值 -97.32 -15.85 -111.93 -16.01 -102.06 -14.21 -90.53 -13.20 极差值 29.81 5.19 43.55 5.49 30.43 4.51 29.54 3.66 平均值 -80.34 -12.08 -84.79 -12.30 -84.10 -12.24 -72.58 -11.21 含量单位：‰. 
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表 2 13C稳定同位素分析测试结果表
Table 2. Stable isotopic analysis and testing results of 13C
样品编号 取样深度/m δ13C/‰ ZK1 175.0 -5.6 ZK3 198.0 -9.0 ZK4 10.7 -8.0 ZK8 1.9 -9.4 ZK14 121.6 -9.4
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表 3 承压水14C测试结果
Table 3. 14C radioactive isotope test results of confined water
样品编号 取样深度/m 现代碳占比/% 校正年龄/ka ZK4 240.0 5.55±1.60 23.90±2.38 ZK3-2 236.0 6.01±0.65 23.24±0.89 ZK3-1 198.0 9.48±0.62 19.48±0.54
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