【摘要】：根據(jù)氫、氧、氦同位素與水化學(xué)組分資料,討論了甘肅東南地區(qū)溫泉水的來(lái)源、地球化學(xué)變化及其與2008年汶川MS8.0地震的關(guān)系。測(cè)定結(jié)果表明:樣品的溶解性固體總量(TDS)范圍為241.7~2 372.1mg/L。采集的7處溫泉(通渭湯池河溫泉、清水地震臺(tái)、天水地震臺(tái)、武山地震臺(tái)、武山22號(hào)井、成縣地震臺(tái)、武都地震臺(tái))水樣可歸為四種化學(xué)類型:Na·CaSO_4、Ca·Mg-SO_4、Na-HCO_3·SO_4、Ca·Mg-SO_4·HCO_3。地下熱水的化學(xué)類型與裂隙深度和圍巖的巖性有關(guān),離子濃度和斷裂深度基本成正相關(guān)。通渭湯池河溫泉和武都地震臺(tái)的δ18O和δD值分別在-11.4‰~-7.6‰和-85.7‰~-57.1‰的范圍內(nèi),通渭湯池河溫泉和武都地震臺(tái)中3 He/4 He的值分別為0.4×10~(-7)和12.7×10~(-7)。氫、氧、氦同位素組成特征表明溫泉水源于大氣降水,在循環(huán)過(guò)程中經(jīng)歷了水巖反應(yīng),且可能有地表水的混入。2008年汶川MS8.0地震發(fā)生后,研究區(qū)域內(nèi)溫泉水中K~+、Ca~(2+)含量總體上升,SO_4~(2-)、Cl~-含量總體下降,Na~+含量變化不明顯;熱水循環(huán)深度受地震影響發(fā)生變化。本文確定了甘肅東南地區(qū)溫泉來(lái)源、水化學(xué)類型成因及其與汶川MS8.0地震的關(guān)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，

本文編號(hào)：2474176