| 新疆塔什库尔干县曲曼地热田地下热水同位素研究 |
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| 关键词:Quman high temperature geothermal field isotope hydrogeochemistry geothermal source recharge conditions |
| 基金项目:新疆维吾尔自治区地质勘查基金项目(编号: 2010006; N10-4-XJ01);中央返还两权价款项目(编号: N15-4-LQ1) |
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| Isotope and Hydrogeochemical Characteristics of the Quman High Temperature Geothermal Field in Taxkorgan, Xinjiang |
| The Quman geothermal field in the Xinjiang region is located in the northern section of the Taxkorgan Tajik Autonomous County in the east-central part of the Pamir Mountains. The borehole exhibits a maximum temperature of up to 162 °C in the Quman geothermal field. In this study, we determined the O, H, S, and He isotopes in geothermal and surface water samples from the field. Combined with hydrologic geochemistry features such as B, Br and Cl, the recharge source, elevation and temperature of the recharge area, heat source of geothermal field, and circulation characteristics were analyzed. The results showed that in the geothermal water, the values of δ18O, δD, and δ34SCDT were –8.00‰ – –10.77‰, –72.50‰ – –82.12‰, and 21.10‰ – 23.76‰, respectively. In the surface water samples, the values of δ18O, δD, and δ34SCDT were –10.50‰ – –13.03‰, –81.68‰ – –93.87‰, and 1.16‰ – 7.05‰, respectively. The value of B was 2.6 – 13.1 mg/L. The value of 4He was 0.01×10–4, and the ratio of 3He to 4He was 0.397 Ra. After analyzing the data, the following conclusions were derived: (1) The δD-δ18O distribution in the Quman geothermal field is below the precipitation line and extends to the upper right. The value of total dissolved solids (TDS) was 1 – 4 g/L, the value of rNa/rCl was higher than 0.85, and the ratio of Cl to Br was higher than 300. The Quman geothermal field has 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, with an elevation of 4657 m, and the temperature during the rainy season ranged from –3 to 2 °C. (2) The ZK7 and ZK22 with higher outlet water temperature and higher thermal storage temperature in the Quman geothermal field show larger ‘Oxygen-18 drift’, the δ18O drift value of the two boreholes was 2.12‰ and 2.35‰, respectively, which should be that of the magmatic heat source geothermal system. (3) The concentration of D in the geothermal water was 4‰ higher than that of the cold water. 34S isotope showed that the geothermal water has the characteristics of deep source sulfur. The ratio of 3He to 4He has the characteristics of the helium isotope composition of mixed atmospheric and crustal sources, the mass concentration of B in the geothermal water was 27 times more than that in other water bodies, which indicated that the geothermal water circulation is relatively deep, and a small amount of primary magmatic water mixing may happen during the deep circulation. |
| SHI Jie,WANG Mei-hua,MA Xiao-jun,WEN Zhang,ZHU Li-tong.2022.Isotope and Hydrogeochemical Characteristics of the Quman High Temperature Geothermal Field in Taxkorgan, Xinjiang[J].Acta Geoscientica Sinica,43(5):645-653. |
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