甘肃东南地区温泉流体地球化学特征
发布时间：2019-05-11 02:19
【摘要】：根据氢、氧、氦同位素与水化学组分资料,讨论了甘肃东南地区温泉水的来源、地球化学变化及其与2008年汶川MS8.0地震的关系。测定结果表明:样品的溶解性固体总量(TDS)范围为241.7~2 372.1mg/L。采集的7处温泉(通渭汤池河温泉、清水地震台、天水地震台、武山地震台、武山22号井、成县地震台、武都地震台)水样可归为四种化学类型:Na·CaSO_4、Ca·Mg-SO_4、Na-HCO_3·SO_4、Ca·Mg-SO_4·HCO_3。地下热水的化学类型与裂隙深度和围岩的岩性有关,离子浓度和断裂深度基本成正相关。通渭汤池河温泉和武都地震台的δ18O和δD值分别在-11.4‰~-7.6‰和-85.7‰~-57.1‰的范围内,通渭汤池河温泉和武都地震台中3 He/4 He的值分别为0.4×10~(-7)和12.7×10~(-7)。氢、氧、氦同位素组成特征表明温泉水源于大气降水,在循环过程中经历了水岩反应,且可能有地表水的混入。2008年汶川MS8.0地震发生后,研究区域内温泉水中K~+、Ca~(2+)含量总体上升,SO_4~(2-)、Cl~-含量总体下降,Na~+含量变化不明显;热水循环深度受地震影响发生变化。本文确定了甘肃东南地区温泉来源、水化学类型成因及其与汶川MS8.0地震的关系。
[Abstract]:Based on the data of hydrogen, oxygen, helium isotopes and hydrochemical compositions, the origin and geochemical changes of warm spring water in southeastern Gansu Province and its relationship with the 2008 Wenchuan MS8.0 earthquake are discussed. The results show that the total dissolved solid (TDS) of the sample is 241.7 脳 2 372.1 mg 路L ~ (- 1). The water samples collected from seven hot springs (Tongwei Tangchi Hot Spring, clear Water Seismic Station, Tianshui Seismic Station, Wushan 22 well, Chengxian Seismological Station, Wudu Seismic Station) can be classified into four chemical types: Na 路CaSO _ 4. Ca Mg-SO_4,Na-HCO_ 3 路SO _ 4, Ca Mg-SO_ 4 路HCO _ 3. The chemical types of geothermal water are related to the fracture depth and the lithology of surrounding rock, and the ion concentration and fracture depth are positively correlated. The 未 18O and 未 D values of Tongwei Tangchi Hot Spring and Wudu Seismological stations are in the range of-11.4 鈥，
本文编号：2474176
[Abstract]:Based on the data of hydrogen, oxygen, helium isotopes and hydrochemical compositions, the origin and geochemical changes of warm spring water in southeastern Gansu Province and its relationship with the 2008 Wenchuan MS8.0 earthquake are discussed. The results show that the total dissolved solid (TDS) of the sample is 241.7 脳 2 372.1 mg 路L ~ (- 1). The water samples collected from seven hot springs (Tongwei Tangchi Hot Spring, clear Water Seismic Station, Tianshui Seismic Station, Wushan 22 well, Chengxian Seismological Station, Wudu Seismic Station) can be classified into four chemical types: Na 路CaSO _ 4. Ca Mg-SO_4,Na-HCO_ 3 路SO _ 4, Ca Mg-SO_ 4 路HCO _ 3. The chemical types of geothermal water are related to the fracture depth and the lithology of surrounding rock, and the ion concentration and fracture depth are positively correlated. The 未 18O and 未 D values of Tongwei Tangchi Hot Spring and Wudu Seismological stations are in the range of-11.4 鈥，
本文编号：2474176
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