四川吉鱼温泉水文地球化学特征及成因机制分析

Hydrogeochemical characteristics and formation mechanism of Jiyu Hot Spring in Sichuan

本文以四川吉鱼温泉为研究对象,运用地质-水文地质调查及测绘、水文地球化学方法,对吉鱼温泉的出露特征、水文地球化学特征、热水的形成条件进行了分析。四川吉鱼温泉补给源为高山区大气降水及冰雪融水,热源主要为来自深部的地幔热源,地热水属正常地温梯度增温。其成因模式可概括为:在略为偏高的区域地热背景之下,高山区的降水或融雪水沿断裂破碎带和裂隙体系渗入地下进入深循环,地下水与围岩经过长期的水岩作用并不断地吸收存储热量,运移至茂汶断裂与吉鱼断裂交汇地段,地热水沿优势的地形地貌部位出露形成温泉。

This paper takes Jiyu hot spring in Sichuan as the research object, analyzes the exposed feature, hydro geochemical characteristicsand formation conditions of Jiyu hot spring by studying on geological-hydrogeological survey and mapping, hydro geochemical method. The water source is regarded as atmospheric precipitation and mountain snow melt water, the heat source is regarded as that the deep mantle heat source, geothermal water is a normal geothermal gradient. The genetic model of the Jiyu hot spring is that under the high regional geothermal heat conditions, the atmospheric precipitation and mountain snow melt water along the fracture zoneand fracture system into the underground to deep circulation, after a long-term water rock interaction of groundwater and surrounding rock, groundwater continue to absorb and storage heat, and migrate to the rendezvous section of Maowen fault and Jiyu fault.Thengeothermal water will crop out in favorable landforms and geological structures.