新疆曲曼高温地热田地下热水同位素研究
投稿时间:2021-12-12  修订日期:2022-03-10  点此下载全文
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史杰 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 831100
汪美华 中国地质环境监测院 
马小军 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 
文章 中国地质大学武汉环境学院 
朱栗佟 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 
基金项目:(编号:2010006;N10-4-XJ01)和中央返还两权价款项目(编号:N15-4-LQ1)联合资助。
中文摘要:新疆塔什库尔干县曲曼地热田位于帕米尔高原中东部的塔什库尔干谷地北段,钻孔揭露最高温度162 ℃。文章测定了曲曼地热田地下热水和地表水样品中的氧、氢、硫、氦等同位素,结合硼、氯等地热地球化学特征,对地热田的补给来源、补给区高程和温度、热源、循环特征等进行了分析。测试结果显示:地下热水中δ18O为-8.00‰~-10.77‰,δ2H为-72.50‰~-82.12‰,δ34SCDT为21.10‰~23.76‰;其他水体中δ18O为-10.50‰~-13.03‰,δ2H为-81.68‰~-93.87‰,δ34SCDT为1.16‰~7.05 ‰;4He值为0.01×10-4,3He/4He为0.397 Ra。对数据进行分析后得到以下结论:(1)曲曼地热田δ2H-δ18O分布在大气降水线下方且具有向右上方延伸的特点,TDS值为1~4g/L,>rNa/rCl(毫克当量比值)>0.85,Cl/Br(体积分数比值)>300,是以大气降水为主要补给来源的循环型地下热水,补给区为地热田西南侧的高山区,高程约4657m,雨季温度-3~2℃;(2)曲曼地热田孔口出水温度较高、热储温度较大的ZK7、ZK22表现出较大的“氧-18漂移”量,δ18O漂移值分别为2.12‰和2.35‰,推测其属于岩浆热源型地热系统;(3)地下热水比冷水富集D超过4‰, 34S同位素显示地下热水体具有深源硫的特点,3He/4He具有大气和地壳混源的氦同位素组成特征,地下热水中B的质量浓度是其他水体的27倍多,说明地下热水循环深度较大,同时在深循环过程中可能有少量初生岩浆水混入。
中文关键词:曲曼高温地热田  同位素  水化学  地热来源  补给条件。
 
Isotope characteristics of the Quman high temperature geothermal field in Xinjiang
Abstract:The Quman Geothermal Field in Tashkorgan County, Xinjiang, is located in the north section of the Tashkurgan Tajik Autonomous County in the east central part of the Pamir Mountains. The borehole reveals a maximum temperature up to 162°C of the Quman Geothermal Field. In this paper, O, H, S and He isotopes in geothermal water and surface water samples from the Quman geothermal field have been determined. Combined with hydrologic geochemistry features such as B and Cl, the recharge source, elevation and temperature of the recharge area, heat source of geothermal field and circulation characteristic are analyzed. The test results are as follows, in the geothermal water, the value of δ18O, δ2H and δ34SCDT is -8.00‰ ~ -10.77‰, -72.50‰ ~ -82.12‰, 21.10‰ ~ 23.76‰, respectively. In the other water, the value of δ18O, δ2H and δ34SCDT is -10.50‰~-13.03‰, -81.68‰ ~ -93.87‰, 1.16‰ ~7.05‰, respectively. The value of 4He is ×10-4, and the ratio of 3He to 4He is 0.397 Ra. After analyzing the data, the conclusions are as follows: (1) The δ2H-δ18O distribution in the Quman geothermal field is below the precipitation line and extends to the upper right. The value of TDS is1~4g/L,the value of rNa/rCl is higher than 0.85,the value of the ratio of Cl to Br is higher than300.The Quman geothermal field is a circulating geothermal water, which is mainly supplied by meteoric water. The recharge area is a high mountain area on the southwest side of the geothermal field, the elevation is about 4657m, and the temperature of the recharge area in rainy season is from -3 to 2°C. (2) The ZK7 and ZK22 with higher outlet water temperature and higher thermal storage temperature in Quman geothermal field show larger ‘Oxygen-18 drift’, the δ18O drift value in the two boreholes is 2.12‰ and 2.35‰, respectively, which is supposed to belong to the magmatic heat source geothermal system. (3) The concentration of D in the geothermal water is 4‰ higher than that of the cold water, the 34S isotope shows that the geothermal water has the characteristics of deep source sulfur, the ratio of 3He to 4He has the characteristics of helium isotope composition of mixed atmospheric and crustal sources, the mass concentration of B in the geothermal water is 27 times than that in other water bodies, which indicate that the depth of geothermal water circulation is relatively deep, and there may be a small amount of primary magmatic water mixing during the deep circulation.
keywords:Quman high temperature geothermal field  isotope  hydrogeochemistry  geothermal source  recharge conditions.
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