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Title:: Hydrogeochemical Characteristic and Formation of the Liuhuangdong Spring in Yunnan Province

作者:: 刘成龙¹; 王广才²; 史浙明²; 孔庆敏²; 赵丹³; 张卉²; 何德强⁴; (1.中国地震局地质研究所,北京 100029; 2.中国地质大学(北京),北京 100083; 3.中国自然资源航空物探遥感中心,北京 100083; 4.昭通市地震局,云南昭通 657000)

Author(s):: LIU Chenglong¹; WANG Guangcai²; SHI Zheming²; KONG Qingmin²; ZHAO Dan³; ZHANG Hui²; HE Deqiang⁴; (1.Institute of Geology,China Earthquake Administration,Beijing 100029,China)(2.China University of Geosciences,Beijing 100083,China)(3.China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China)(4.Zhaotong Earthquake Agency,Zhaotong 657000,Yunnan,China)

Keywords:: Liuhuangdong spring; hydrogeochemical characteristic; formation mechanism; Dabaochang fault

摘要:: 以云南巧家硫磺洞温泉为研究对象,开展水化学类型、温泉水循环特征和成因研究,并对其监测地震前兆的适宜性进行研究。结果显示:该温泉的水化学类型为HCO₃·SO₄-Ca·Mg型,主要为海拔2 200～2 300 m的大气降水入渗补给,热储温度约为210 ℃,循环深度为4 742.5 m,且与该地区地震震源深度优势面基本吻合。硫磺洞温泉的成因为大气降水入渗经过深循环后沿逆冲型大包厂断裂流出地表而形成,硫磺洞温泉对该地区地震发生起着重要的影响作用。分析认为,大包厂断层地震活动性较强,且温泉循环深度较深,适宜进行地震前兆地球化学观测。

Abstract:: We have studied the Liuhuangdong spring to evaluate whether it is suited for monitoring earthquakes,including hydrochemical type,water cycle characteristics,and formation mechanism.The results indicate that the hydrochemical type of spring is of HCO₃·SO₄-Ca·Mg.The water originates from a geothermal reservoir at about 4 742.5 m depth and supplies by meteoric water at about 2 200～2 300 m altitude.The temperature of the geothermal reservoir is about 210 ℃.The circulation depth of spring is the same as the preferred plane of focal depth in this area.The research results show that the Liuhuangdong spring mainly comes from rainfall infiltration.The rainfall is heated by the surrounding rock during the runoff.Then,it comes out along the Dabaoshan fault.Hence,the Liuhuangdong spring plays an important role in earthquakes formation in this area.Due to the strong seismic activity of the Dabaoshan fault,the Liuhuangdong spring with a deep circulation is suited for earthquakes monitoring.