CAJ | 학술논문

应用环境同位素水文地球化学方法,结合区域沉积演化史,对关中盆地固市凹陷、咸阳－礼泉断阶和西安凹陷深部地下热水成因类型进行了探讨,并就残存沉积水存在的可能性,寻找氢氧同位素关系、硫氧同位素关系、碳氧同位素关系、N(87 Sr)/N(86 Sr)与古盐度的关系等环境同位素证据,rNa/rCl值、ρ(Cl－)/ρ(Br－)、rBr/rI值与ρ(Cl－)的关系等水文地球化学证据以及沉积演化史证据。结果表明：固市凹陷华阴地下热水的同位素、水文地球化学特征已基本符合沉积水的特征,推测其为混有古入渗水的残存沉积水；固市凹陷华阴之外的其他构造单元、咸阳—礼泉断阶和西安凹陷地下热水的同位素和水文地球化学特征部分接近沉积水的特征,部分介于古入渗水和沉积水之间；咸阳—礼泉断阶东部地下热水可能为古入渗水或残存沉积水与后期入渗水的混合；西安凹陷及咸阳—礼泉断阶西部地下热水属于现代入渗水与古入渗水的混合水。
응용배경동위소수문지구화학방법,결합구역침적연화사,대관중분지고시요함、함양－례천단계화서안요함심부지하열수성인류형진행료탐토,병취잔존침적수존재적가능성,심조경양동위소관계、류양동위소관계、탄양동위소관계、N(87 Sr)/N(86 Sr)여고염도적관계등배경동위소증거,rNa/rCl치、ρ(Cl－)/ρ(Br－)、rBr/rI치여ρ(Cl－)적관계등수문지구화학증거이급침적연화사증거。결과표명：고시요함화음지하열수적동위소、수문지구화학특정이기본부합침적수적특정,추측기위혼유고입삼수적잔존침적수；고시요함화음지외적기타구조단원、함양—례천단계화서안요함지하열수적동위소화수문지구화학특정부분접근침적수적특정,부분개우고입삼수화침적수지간；함양—례천단계동부지하열수가능위고입삼수혹잔존침적수여후기입삼수적혼합；서안요함급함양—례천단계서부지하열수속우현대입삼수여고입삼수적혼합수。
Combined with the regional sedimentary evolution history,the genetic types of deep geothermal water in Gushi depression,Xianyang-Liquan fault terrace and Xi’an depression of Guanzhong Basin were discussed by the environmental isotope and hydrogeochemistry methods;environmental isotope evidences including the relationships between hydrogen and oxygen isotopes,sulfide and oxygen isotopes,carbon and oxygen isotopes,and N(87 Sr)/N(86 Sr)and paleosalinity,hydrogeochemistry evidences including the relationships of rNa/rCl,ρ(Cl-)/ρ(Br-),rBr/rI toρ(Cl-),and sedimentary evolution evidences were used to find the remaining sedimentary water in the deep geothermal water. The results show that the isotope and hydrogeochemistry characteristics of geothermal water from Huayin in Gushi depression are similar with that of sedimentary water,so that the geothermal water is remaining sedimentary water mixed with paleo-leaching water;the isotope and hydrogeochemistry characteristics of geothermal water in Xianyang-Liquan fault terrace,Xi’an depression and Gushi depression except Huayin are partly close to that of sedimentary water,and partly between paleo-leaching water and sedimentary water;the geothermal water in the eastern Xianyang-Liquan fault terrace may be paleo-leaching water or the remaining sedimentary water mixed with later leaching water;the geothermal waters in Xi’an depression and the western Xianyang-Liquan fault terrace are the mixture of present- and paleo-leaching waters.