喀什平原区地下水同位素年龄特征及更新速率分析  

Isotopic Age Characteristics and Renewal Rate of Groundwater in Kashgar Plain

作　　者：乃尉华 史杰[2] 王文科[3] 王艺星 段磊[3] 李斌[2] Nai Weihua;Shi Jie;Wang Wenke;Wang Yixing;Duan Lei;Li Bin(No.3 Hydrogeological and Engineering Geological Team of Xinjiang Bureau of Geology and Mineral Resources Exploration and Development,Kashgar,Xinjiang,844099,China;No.2 Hydrogeological and Engineering Geological Team of Xinjiang Bureau of Geology and Mineral Resources Exploration and Development,Changji,Xinjiang,831100,China;School of environm ental science and engineering,Chang＇an University,Xi＇ an,Shaanxi,710054,China)

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局第三水文工程地质大队,新疆喀什844000 [2]新疆维吾尔自治区地质矿产勘查开发局第二水文工程地质大队,新疆昌吉831100 [3]长安大学环境科学与工程学院,陕西西安710054

出　　处：《新疆地质》2018年第3期406-409,共4页Xinjiang Geology

基　　金：中国地质调查局地质调查基金项目"新疆喀什经济开发区水文地质环境地质调查评价项目"(1212011220977)资助

摘　　要：为分析喀什平原区300 m以浅地下水年龄和更新速率,准确划分地下水流系统,采用了3H和14C放射性同位素测试方法,对采集的120组地下水样品中3H和14C同位素组成进行了分析,研究了喀什平原区不同区域地下水的年龄特征。结果表明,研究区大部分潜水氚值为12.2~39.6 TU,地下水年龄从山前冲洪积砾质平原至细土平原区逐渐增大,为10~50年;在中部库木塔格背斜隆起一带,潜水氚值小于10 TU,地下水年龄大于500年,形成地下水年龄分水岭;区内地下水14C年龄约为2 000~13 000年,反映了地下水补给时段差异较大。从山前冲洪积砾质平原上游至冲积细土平原中部地区,地下水更新速率约为2%~7%,属积极交替带;冲积细土平原中下游地区,地下水更新速率约为1%~2%,属较积极交替带;在冲积细土平原下游地区,地下水更新速率均小于1%,属弱交替带。In order to analyze the Kashgar plain area of 300 meters in the shallow groundwater age and update rate, and the accurate division of groundwater system,3H and 14C radioactive isotope testing methods were used to analyze 120 sets of water samples,and the characteristics of groundwater age in different areas of Kashi plain were studied in this paper. The results show that most of the phreatic tritium values in the study area are between 12.2 and39.6TU, and the age of groundwater increases gradually from the piedmont alluvial flood plain to the fme soil plain area, its age is between 10- 50 years; In the middle of Kumtag anticline uplift area, diving tritium value is less than 10TU, the groundwater age is more tthan 500 years, and Kumtag anticline uplift area is groundwater age watershed; The 14C age rangein the inland wa- ter area is about 2 000-13 000 years, indicating that the recharge period of groundwater is quite different;From the alluvi- al plain of piedmont alluvial plain to the middle part of alluvial plain soil, the groundwater renewal rate is about 2% to 7%, which is an active alternation zone; In the middle or lower reaches of alluvial plain soil, the groundwater renewal rate is about 1% to 2%, which belongs to a more active alternate zone; In the lower reaches of alluvial plain soil, the groundwater renewal rate is less than 1%,which belongs to the weak alternating zone.

关 键 词：喀什 地下水 放射性同位素 年龄 更新速率 

分 类 号：P597[天文地球—地球化学] P641.7[天文地球—地质学]