C and O isotopic data demonstrate that these gases are derived from the felsic magmasystem;
气体的碳、氦同位素资料表明其来自长英质岩浆体系；
2
The existing of earthquake swarm, S wave shadow in some seismic stations and gradually uplifting of surface suggest a magmasystem beneath these volcanoes.
火山区存在的震群活动、部分台站观测到的S波阴影区以及地表的缓慢抬升等，指示火山区存在一个岩浆系统。
3
They are formed from groundwater saturated in calcium sulphate which, warmed by an intrusion of magma about a mile below, began filtering through the cave system millions of years ago.