同位素技术解析安阳河与地下水相互作用

河流与地下水相互作用研究是水文学研究的难点和热点。安阳河与地下水相互作用研究,对于安阳市水资源科学开发与管理具有重要意义。安阳河冲洪积扇地表水与地下水转化率为17%～27%。潜水位标高为80 m,向下游逐渐变成多层含水层（水位40 m）。当地降水环境同位素监测数据表明,当地大气降水线与全球大气降水线接近平行,表明该线代表本地区大气降水的氢氧同位素特征。地表水同位素值较集中,2016年8月δ18O值变化范围为-9‰~-8.7‰,δD值变化范围为-65‰~-63‰,2017年1月δ18O值变化范围为-8.5‰~-8.2‰,δD值变化范围为-63‰~-61‰,河水水化学类型为HCO3·SO4—Ca型,表明流域内地表水的同位素值受距离的影响较小。地下水稳定同位素值变化较大,2016年8月δ18O值范围为-10.4‰~-5.5‰,δD值范围为-75‰~-46‰,2017年1月δ18O值范围为-10.2‰~-5.4‰,δD值范围为-75‰~-45‰,即从接近降水值到最大值形成一条“蒸发”线。河流出山口一带地下水同位素值呈现最大蒸发值,表明地表水补给地下水,地下水化学类型为HCO3·SO4·Cl—Ca,存在明显人为污染成分。下游为大气降水补给浅层地下水,中深层地下水主要来源于中游侧向径流,水化学类型主要为HCO3—Ca·Mg型,综合分析表明,安阳河中下游（冲洪积扇）地带“三水”转换积极,并影响其水质、水量。     

污灌区地下水硝酸盐污染来源的氮同位素示踪

为了识别石家庄市南部污灌区地下水硝酸盐污染来源, 采集5种潜在污染源和19组地下水样用于化学和氮同位素分析.灌溉污水NH₄+的δ15N值较低(4.0‰), 施化肥土壤和粪堆下土壤NO₃-的δ15N值分别为1.4‰和12.4‰; 仅施厩肥的蔬菜种植区下伏近30 m厚包气带沉积物NO₃-的δ15N分布显示, 来自动物粪便的NO₃-已运移到11.5 m以下包气带, 均值10.9‰; 污水灌溉农田下伏厚层包气带沉积物样品分析结果指示, 土壤层下伏包气带沉积物δ15N值变幅较小, 均值5.7‰.污灌区内除一深井外, 其他水井地下水硝酸盐浓度变化在52.6~124.5 mg/L之间, 均值79.72 mg/L, δ15N值变化在5.3‰~8.3‰之间, 均值7.0‰.污灌区地下水的δ15N值较污灌区土壤层下伏包气带沉积物的δ15N值高, 表明地下水NO₃-除了来自灌溉的污水外, 还有δ15N值更高的其他来源, 这些来源主要是人和动物粪便.利用线性混合模型计算, 污灌区地下水NO₃-来自灌溉的污水, 约占76%, 而来自人和动物粪便的NO₃-约占24%.为控制污灌区地下水NO₃-浓度进一步增长, 不仅要加强污水灌溉管理, 还要加强人和动物粪便的管理.      

硫和氧同位素示踪黄河及支流河水硫酸盐来源

为了准确识别河水硫酸盐受自然风化和人为活动影响的过程,做好地表水资源管理,选择黄河小浪底水库以下干流和支流河水为主要研究对象,分期采集河水样品,采用硫酸盐硫和氧同位素,结合水化学组成及潜在硫酸盐来源硫和氧同位素范围,判定黄河及支流河水硫酸盐的来源及混入比例。结果表明:① 研究区黄河河水硫酸盐主要来源于第四纪黄土中易溶硫酸盐,干流河水SO₄2-含量均值为2.23 mmol/L,δ34S_SO4和δ18O_SO4均值分别为+8.9‰和+10.4‰;② 研究区沁河丰水期河水硫酸盐24%来源于大气降水,61%来源于土壤硫酸盐溶解,15%来自于石膏溶解;平水期河水硫酸盐39%来源于大气降水,36%来源于土壤硫酸盐溶解,25%来源于石膏溶解。沁河河水SO₄2-含量均值为2.44 mmol/L,δ34S_SO4和δ18O_SO4均值分别为+9.8‰和+9.7‰;③ 研究区洛河河水硫酸盐受生活污水影响较大,伊河河水硫酸盐受到土壤硫酸盐溶解和化学肥料溶解的共同影响,伊洛河河水SO₄2-含量均值为1.27 mmol/L,δ34S_SO4和δ18O_SO4均值分别为+10.4‰和+6.5‰。蒸发盐类矿物溶解以及土壤硫酸盐溶解等自然风化过程是控制区域河水硫酸盐来源的重要过程,人为活动对伊洛河河水硫酸盐的贡献不容忽视。     

Tracing stable isotope values from meteoric water to groundwater in the southwestern part of the Chad basin

The southwestern Chad basin is a semi-arid region with annual rainfall that is generally less than 500 mm and over 2,000 mm of evapotranspiration. Surface water in rivers is seasonal, and therefore groundwater is the perennial source of water supply for domestic and other purposes. Stable isotope has been measured for rainwater, surface water and groundwater samples in this region. The stable isotope data have been used to understand the inter-relationships between the rainwater, surface water, shallow and deep groundwater of this region. This is being used in a qualitative sense to demonstrate present day recharge to the groundwater. Stable isotope in rainwater for the region has an average value of –4‰ δ¹⁸O and –20‰ δ²H. Surface water samples from rivers and Lake Chad fall on the evaporation line of this average value. The Upper Zone aquifer water samples show stable isotope signal with a wide range of values indicating the complex character of the aquifer Zone with three distinguishable units. The wide range of values is attributable to waters from individual unit and/or mixture of waters of different units. The Middle and Lower aquifers Zones’ waters show similar stable isotopes values, probably indicating similarity in timing and/or mechanism of recharge. These are palaeowaters probably recharged under a climate that is different from today. The Upper Zone aquifer is presently being recharged as some of its waters show stable isotope compositions similar to those of average rainfall waters of the region.     

新疆焉耆盆地水环境氢氧同位素特征及其指示作用

根据焉耆盆地开都河水及其两岸地下水中的氢氧稳定同位素资料及氘过量参数(d)值,分析了焉耆盆地内不同水体的δ(D)、δ(18O)和d值的分布规律,并得到地下水的主要补给来源及其与开都河水的相互作用关系;地下水的δ(D)在-87.60‰～-61.82‰间,δ(18O)在-10.90‰～-9.73‰间;开都河水的δ(D)在-71.95‰～-58.58‰间,δ(18O)在-9.57‰～-8.64‰间。结果表明:焉耆盆地内地下水和地表水同源于山区的降水和冰雪融水,且经历了较强的蒸发作用;地下水与地表水之间的直接水力联系较弱,深层地下水主要接受开都河水在洪积扇区的入渗补给,浅层地下水主要接受河流引水灌溉入渗;不同深度地下水之间的水力联系较为密切,为统一的地下水系统。     

黄河小浪底水库水沙调控与流域硫循环

陆地风化的硫酸盐(SO42?)通过河流体系输入海洋,其通量以及硫酸盐同位素组成(δ34SSO4和 δ18OSO4)对全球硫循环及海洋SO42?同位素组成至关重要.河流体系SO42?含量及δ34SSO4和δ18OSO4组成不但受SO42?来源控制,而且受河流内部硫酸盐细菌还原及氧化过程影响,但其影响程度仍不明确,特别是拦...     

Synopsis of strontium isotope variations in groundwater at Äspö, southern Sweden

Strontium isotope ratios are used to identify end-member ground-water compositions at Äspö in southeastern Sweden where the Hard Rock Laboratory (HRL) has been constructed to evaluate the suitability of crystalline rock for the geologic disposal of nuclear waste. The Hard Rock Laboratory is a decline (tunnel) constructed in 1.8 Ga-old granitic rock that forms islands in an archipelago along the Swedish coast. Ground-water samples were obtained for isotopic analyses from boreholes drilled from the surface and from side boreholes drilled within the HRL. Infiltration at Äspö occurs primarily through fractures zones in the granitic bedrock beneath thin soils throughout the area. Because of extremely low Sr concentrations, rain and snow are not important contributors to the Sr isotope budget of the ground-water system. At shallow levels, water percolating downward along fractures and fracture zones acquires a δ⁸⁷Sr between +9.5 and +10.0‰ and maintains this value downward while Sr concentrations increase by two orders of magnitude. Ground-water samples from both boreholes and from in the HRL show the effects of mixing with saline waters containing as much as 59 mg/L Sr and δ⁸⁷Sr values as large as +13.9‰. Baltic Sea water is a potential component of the groundwater system with δ⁸⁷Sr values only slightly larger than modern marine values (+0.3‰) but with much lower concentrations (1.5 mg/L) than ocean water (8 mg/L). However, because of large Sr concentration differences between the saline groundwater (59 mg/L) and Baltic Sea water (1.5 mg/L), δ⁸⁷Sr values are not particularly sensitive indicators of sea-water intrusion even though their δ⁸⁷Sr values differ substantially.     

Oxygen and Hydrogen Isotopes of Waters in the Ordos Basin,China: Implications for Recharge of Groundwater in the North of Cretaceous Groundwater Basin

Hundreds of precipitation samples collected from meteorological stations in the Ordos Basin from January 1988 to December 2005 were used to set up a local meteoric water line and to calculate weighted average isotopic compositions of modern precipitation. Oxygen and hydrogen isotopes, with averages of ?7.8‰ and ?53.0‰ for δ18O and δD, respectively, are depleted in winter and rich in spring, and gradually decrease in summer and fall, illustrating that the seasonal effect is considerable. They also show that the isotopic difference between south portion and north portion of the Ordos Basin are not obvious, and the isotope in the middle portion is normally depleted. The isotope compositions of 32 samples collected from shallow groundwater (less than a depth of 150 m) in desert plateau range from ?10.6‰ to ?6.0‰ with an average of ?8.4‰ for δ18O and from ?85‰ to ?46‰ with an average of ?63‰ for δD. Most of them are identical with modern precipitation. The isotope compositions of 22 middle and deep groundwaters (greater than a depth of 275 m) fall in ranges from ?11.6‰ to ?8.8‰ with an average of ?10.2‰ for δ18O and from ?89‰ to ?63‰ with an average of ?76‰ for δD. The average values are significantly less than those of modern precipitation, illustrating that the middle and deep groundwaters were recharged at comparatively lower air temperatures. Primary analysis of 14C shows that the recharge of the middle and deep groundwaters started at late Pleistocene. The isotopes of 13 lake water samples collected from eight lakes define a local evaporation trend, with a relatively flat slope of 3.77, and show that the lake waters were mainly fed by modern precipitation and shallow groundwater.     

乌兰布和沙漠北部地下水资源的环境同位素探讨

工作范围在乌兰布和沙漠北部,面积共约4200km2.年平均降水量85～140mm,由西南向东递增,降水同位素组成δD～δ18O恰与Craig线一致,并与阿拉善地区相同.测得地下水中同位素含量范围,δ18O为-74‰～121‰,氚为0～190TU,14C为17～97pMC.由地下水同位素组成区别出与降水线平行或相交的6种类型.从所有地下水水点,以及可能有补给关系的其它水点的各类同位素关系,包括δ18O,T,δ13C和pMC,识别出两类承压水的各3个补给源和潜水的3个补给源,并区别出一组氚含量极低的潜水,对不同位置的承压水和潜水,由其同位素关系估算出了各补给源的组成和变幅.     

Changes to depositional palaeoenvironments within the Qikou depression (Bohaiwan Basin,China): carbon and oxygen isotopes in lacustrine carbonates of the Palaeogene Shahejie Formation

This paper reports the carbon and oxygen isotope compositions of lacustrine carbonate sediments from the Palaeogene Shahejie Formation, Qikou depression, Bohaiwan Basin, with the aim of determining the palaeoenvironmental conditions in the region. Results from Es₂, the second member of the Shahejie Formation, showed values of δ¹³C and δ¹⁸O from –1.2‰ to +2.4‰ (average +0.6‰) and from –6.8‰ to –4.7‰ (average –5.7‰), respectively, suggesting a relatively hot climate attending deposition. The slightly closed nature of the lake, which contains brackish water, resulted in higher carbonate δ¹³C and δ¹⁸O values than in a meteoric environment. The values of δ¹³C and δ¹⁸O preserved within the carbonates of the overlying lower Shahejie I (Es₁) varied between +1.3‰ and +4.9‰ (average +3.2‰) and from ?4.4‰ to ?1.8‰ (average ?3.1‰), respectively, indicating that the climate became colder at that time. Subsequently, a marine transgression caused the salinity of the lake water to increase. The values of δ¹³C and δ¹⁸O were controlled by salinity. The high δ¹³C values were also influenced by the rapid burial of the lake organisms and by algal photosynthesis. Values of δ¹³C and δ¹⁸O from carbonates in upper Es₁ ranged from ?8.0‰ to +11.0‰ (average +10.1‰) and from ?5.0‰ to ?1.5‰ (average ?3.4‰), respectively, indicating a slight increase in the temperature over time. In the closed and reducing environment, extremes in δ¹³C values resulted from biochemical fermentation. The positive δ¹³C excursion recorded in the carbonates of the Shahejie Formation in the Qikou depression indicates that the palaeoclimate underwent a significant transformation during the Eocene and the Oligocene.     

Investigation on the hydrodynamics of Ganga Alluvial Plain using environmental isotopes: a case study of the Gomati River Basin, northern India

An investigation using environmental isotopes (δ¹⁸O and δD) was conducted to gain insight into the hydrological processes of the Ganga Alluvial Plain, northern India. River-water, shallow-groundwater and lake-water samples from the Gomati River Basin were analyzed. During the winter season, the δ¹⁸O and δD compositions of the Gomati River water ranged from ?1.67 to ?7.62 ‰ and ?25.08 to ?61.50 ‰, respectively. Deuterium excess values in the river water (+0.3 to ?13 ‰) and the lake water (?20 ‰) indicate the significance of evaporation processes. Monthly variation of δ¹⁸O and δD values of the Gomati River water and the shallow groundwater follows a similar trend, with isotope-depleted peaks for δ¹⁸O and δD synchronized during the monsoon season. The isotopically depleted peak values of the river water (δ¹⁸O?=??8.30 ‰ and δD?=??57.10 ‰) can be used as a proxy record for the isotopic signature of the monsoon precipitation in the Ganga Alluvial Plain.     

咸化水体中DIC的同位素组成及环境过程分析

系统采集了天津地区地表水样品,对其溶解无机碳的稳定碳同位素比值(δ13CDIC)及相关化学组成进行了全面测定,以期对咸化并且受到污染水体中的溶解无机碳的来源和迁移转化特征进行探讨.研究结果显示,天津地表水中溶解无机碳的δ13CDIC值主要分布于0.27‰～ -14.9‰之间,显示了相对较宽的分布范围.同时,天津地表水体...     

Application of multiple-isotope and groundwater-age data to identify factors affecting the extent of denitrification in a shallow aquifer near a river in South Korea

The extent of denitrification in a small agricultural area near a river in Yangpyeong, South Korea, was determined using multiple isotopes, groundwater age, and physicochemical data for groundwater. The shallow groundwater at one monitoring site had high concentrations of NO₃-N (74–83 mg L^?1). The δ¹⁵N-NO₃ values for groundwater in the study area ranged between +9.1 and +24.6‰ in June 2014 and +12.2 to +21.6‰ in October 2014. High δ¹⁵N-NO₃ values (+10.7 to +12.5‰) in both sampling periods indicated that the high concentrations of nitrate in the groundwater originated from application of organic fertilizers and manure. In the northern part of the study area, some groundwater samples showed elevated δ¹⁵N-NO₃ and δ¹⁸O-NO₃ values, which suggest that nitrate was removed from the groundwater via denitrification, with N isotope enrichment factors ranging between ?4.8 and ?7.9‰ and O isotope enrichment factors varying between ?3.8 and ?4.9‰. Similar δD and δ¹⁸O values of the surface water and groundwater in the south appear to indicate that groundwater in that area was affected by surface-water infiltration. The mean residence times (MRTs) of groundwater showed younger ages in the south (10–20 years) than in the north (20–30 years). Hence, it was concluded that denitrification processes under anaerobic conditions with longer groundwater MRT in the northern part of the study area removed considerable amounts of nitrate. This study demonstrates that multi-isotope data combined with physicochemical data and age-dating information can be effectively applied to characterize nitrate contaminant sources and attenuation processes.     

保德地区煤层气地球化学特征及成因探讨

为了查明保德地区煤层气地球化学特征及成因,采集煤样、煤层气样及水样,开展气体组分分析、煤层气井产出水水质检测和稳定同位素分析。结果表明:煤层气组成中烃类气体以CH₄为主,体积分数为88.60%~97.59%;含有少量乙烷,体积分数仅为0.01%~0.14%;干燥系数均大于0.99,属于极干煤层气。非烃类组分中,主要含有CO₂和N₂,其中,CO₂体积分数为1.74%~7.61%,N₂体积分数为0.04%~8.18%。煤层气δ13C(CH₄)值为–56.8‰~–47.7‰,δ13C(CO₂)值为–6.6‰~13.9‰,δD(CH₄)值为–252.6‰~–241.6‰。煤层产出水呈弱碱性,属于NaHCO₃类型水,与地表水离子构成、矿化度、δD(H₂O)和δ18O(H₂O)值均相近,有地表水的补给,有利于产CH₄菌大量繁殖,生成次生生物气。综合认为,研究区煤层气为热成因气和生物气的混合气,生物成因气主要是通过二氧化碳还原作用形成,受煤层解吸–扩散–运移作用、水溶作用和次生生物作用导致煤层气“变轻”。研究成果为后续煤层气勘探开发提供指导。      

Isotopic and geochemical evolution of ground and surface waters in a karst dominated geological setting: a case study from Belize,Central America

Analysis of stable isotopes and major ions in groundwater and surface waters in Belize, Central America was carried out to identify processes that may affect drinking water quality. Belize has a subtropical rainforest/savannah climate with a varied landscape composed predominantly of carbonate rocks and clastic sediments. Stable oxygen (δ¹⁸O) and hydrogen (δD) isotope ratios for surface and groundwater have a similar range and show high d-excess (10–40.8‰). The high d-excess in water samples suggest secondary continental vapor flux mixing with incoming vapor from the Caribbean Sea. Model calculations indicate that moisture derived from continental evaporation contributes 13% to overhead vapor load. In surface and groundwater, concentrations of dissolved inorganic carbon (DIC) ranged from 5.4 to 112.9 mg C/l and δ¹³C_DIC ranged from −7.4 to −17.4‰. SO₄², Ca²⁺ and Mg²⁺ in the water samples ranged from 2–163, 2–6593 and 2–90 mg/l, respectively. The DIC and δ¹³C_DIC indicate both open and closed system carbonate evolution. Combined δ¹³C_DIC and Ca²⁺, Mg²⁺, and SO₄²⁻ suggest additional groundwater evolution by gypsum dissolution and calcite precipitation. The high SO₄²⁻content of some water samples indicates regional geologic control on water quality. Similarity in the range of δ¹⁸O, δD and δ¹³C_DIC for surface waters and groundwater used for drinking water supply is probably due to high hydraulic conductivities of the karstic aquifers. The results of this study indicate rapid recharge of groundwater aquifers, groundwater influence on surface water chemistry and the potential of surface water to impact groundwater quality and vise versa.     

Identifying the Sources of Solutes in Karst Groundwater in Chongqing,China: a Combined Sulfate and Strontium Isotope Approach

Groundwater from karst subterranean streams is among the world’s most important sources of drinking water supplies, and the hydrochemical characteristics of karst water are impacted by both natural environment and people. Therefore, the study of hydrochemistry and its solutes’ sources is very important to ensure the normal function of life support systems. In this paper, thirty?five representative karst groundwater samples were collected from different aquifers (limestone and dolomite) and various land use types in Chongqing to trace the sources of solutes and relative hydrochemical processes. Hydrogeochemical types of karst groundwater in Chongqing were mainly of the Ca?HCO3 type or Ca (Mg)?HCO3 type. However, some hydrochemical types of karst groundwater were the K+Na+Ca?SO4 type (G25 site) or Ca?HCO3+SO4 type (G26 and G14 site), indicating that the hydrochemistry of these sites might be strongly influenced by anthropogenic activities or unique geological characteristics. The dissolved Sr concentrations of the studied groundwater ranged from 0.57 to 15.06 μmmol/L, and the 87Sr/86Sr varied from 0.70751 to 0.71627. The δ34S?SO42? fell into a range of ?6.8‰?21.5‰, with a mean value of 5.6‰. The variations of both 87Sr/86Sr and Sr values of the groundwater samples indicated that the Sr element was controlled by the weathering of limestone, dolomite and silicate rock. However, the figure of 87Sr/86Sr vs. Sr2+/[K++Na+] showed that the anthropogenic inputs also obviously contributed to the Sr contents. For tracing the detailed anthropogenic effects, we traced the sources of solutes collected karst groundwater samples in Chongqing according to the δ34S value of potential sulfate sources. The variations of both δ34S and 1/SO42? values of the groundwater samples indicated that the atmospheric acid deposition (AAD), dissolution of gypsum (GD), oxidation of sul?de mineral (OS) or anthropogenic inputs (SF: sewage or fertilizer) have contributed to solutes in karst groundwater. The influence of oxidation of sul?de mineral, atmospheric acid deposit and anthropogenic inputs to groundwater in Chongqing karst areas was much widespread.     

Seasonal variability of oxygen and hydrogen isotopes in a wetland system of the Yunnan-Guizhou Plateau,southwest China: a quantitative assessment of groundwater inflow fluxes

The Caohai Wetland serves as an important ecosystem on the Yunnan–Guizhou Plateau and as a nationally important nature reserve for migratory birds in China. In this study, surface water, groundwater and wetland water were collected for the measurement of environmental isotopes to reveal the seasonal variability of oxygen and hydrogen isotopes (δ¹⁸O, δD), sources of water, and groundwater inflow fluxes. Results showed that surface water and groundwater are of meteoric origin. The isotopes in samples of wetland water were well mixed vertically in seasons of both high-flow (September) and low-flow (April); however, marked seasonal and spatial variations were observed. During the high-flow season, the isotopic composition in surface wetland water varied from ?97.13 to ?41.73‰ for δD and from ?13.17 to ?4.70‰ for δ¹⁸O. The composition of stable isotopes in the eastern region of this wetland was lower than in the western region. These may have been influenced by uneven evaporation caused by the distribution of aquatic vegetation. During the low-flow season, δD and δ¹⁸O in the more open water with dead aquatic vegetation ranged from ?37.11 to ?11.77‰, and from ?4.25 to ?0.08‰, respectively. This may result from high evaporation rates in this season with the lowest atmospheric humidity. Groundwater fluxes were calculated by mass transfer and isotope mass balance approaches, suggesting that the water sources of the Caohai Wetland were mainly from groundwater in the high-flow season, while the groundwater has a smaller contribution to wetland water during the low-flow season.     

Isotope analysis of nitrate pollution sources in groundwater of Dong’e geohydrological unit

As nitrate pollution in groundwater has become increasingly serious in recent years, nitrogen isotope was adopted in this paper to define its sources in a typical agricultural area of Dong’e hydrogeological unit. The results show that: Higher content of NO3- detected in shallow groundwater is 27.77 mg/L on average and δ15N content ranges from 7.8‰ to 12 ‰, indicating that shallow groundwater is mainly contaminated by sewage or feces. In contrast, less NO3- in deep groundwater (karst water) has an average value of 12.81 mg/L and δ15N content is between 7.2‰ and 14.3‰, which is closely related to human disturbance as mentioned above. In addition, considering relatively low groundwater quality at some monitoring sites, reasonable fertilization is a better choice in the study area to reduce nitrate source in groundwater.     

Isotope analysis of nitrate pollution sources in groundwater of Dong'e geohydrological unit

As nitrate pollution in groundwater has become increasingly serious in recent years, nitrogen isotope was adopted in this paper to define its sources in a typical agricultural area of Dong'e hydrogeological unit. The results show that: Higher content of NO_3~- detected in shallow groundwater is 27.77 mg/L on average and δ15 N content ranges from 7.8‰ to 12 ‰, indicating that shallow groundwater is mainly contaminated by sewage or feces. In contrast, less NO_3~- in deep groundwater(karst water) has an average value of 12.81 mg/L and δ15 N content is between 7.2‰ and 14.3‰, which is closely related to human disturbance as mentioned above. In addition, considering relatively low groundwater quality at some monitoring sites, reasonable fertilization is a better choice in the study area to reduce nitrate source in groundwater.     

自生片钠铝石的碳氧同位素特征及其成因意义

自生片钠铝石的碳氧同位素特征可以为片钠铝石的成因研究提供重要的地球化学依据。以海拉尔盆地乌尔逊凹陷和松辽盆地孤店构造片钠铝石碳氧同位素分析为基础,结合国内外已报道的自生片钠铝石的碳氧同位素数据,对自生片钠铝石的碳氧同位素特征及其成因意义进行了探讨。研究表明,海拉尔盆地乌尔逊凹陷和松辽盆地南部孤店CO2气田砂岩中片钠铝石的δ13C范围分别为–5.3‰～–1.5‰（PDB）、–1.9‰～+0.3‰（PDB）,均分布于含无机碳物质δ13C分布区间（－9.0‰～＋2.7‰）内。计算出的海拉尔盆地和松辽盆地与片钠铝石平衡的CO2气碳同位素分布范围分别为－10.7～－7.0‰（PDB）、－8.7～－6.9‰（PDB）,表明片钠铝石绝大部分形成于无机CO2背景。实际地质观察中形成片钠铝石的CO2绝大多数为岩浆脱气来源,岩浆成因片钠铝石碳同位素分布范围为－5.5～＋4.5‰（PDB）。海拉尔盆地和松辽盆地的片钠铝石是岩浆成因CO2气运移、聚集的特征矿物。计算出的海拉尔盆地和松辽盆地片钠铝石沉淀时介质水的δ18O值范围为-14.3～-9.4‰（SMOW）,表现为轻同位素的特点,表明片钠铝石形成时地层水为大气降水。计算出的海拉尔盆地片钠铝石同位素为52.7～93.6℃,与样品所在深度处的古地温范围（65.4～87.6℃）基本吻合。