Geochemical Characteristics of Gases From Hot Springs in Seismic Region

Chemical and isotopic compositions of He, Ar, CH4(δ13C) of hot spring gas in Lancang and Batang earthquake regions show that the concentrations of He , H2 , non-atmospheric sourced N2 and 3He/4He value are closely related to seismic activity. During earthquake activity, gas release is related to the dilation that rocks take on under stress action. Earthquake magnitude (energy) between the two seismic regions suggests that the amount of released gas from rocks increases significantly with the increase of magnitude and energy. As indicators of earthquake prediction, the following parameters of gases from hot spring are effective: He, 3He/4He, H2 and N2B/N2total.     

超临界流体萃取及GC-MS对极地现代沉积物的分析

应用超临界萃取/气相色谱-质谱技术测定南极现代沉积物中的正构烷烃、甾烷、藿烷,其分析结果与经典索氏抽提基本相符.该方法所需样品量仅为索氏抽提的1/10,且高效、快速、无污染和危险,可用于少量特殊地质样品中生物标志化合物的萃取分析.