川滇块体边界断裂的CO2释放及其来源

川滇块体边界断裂沿线及附近地区有大量的CO_2泉出露,其分布与1900年以来强震震中的分布大体一致,这表明该区CO_2释放可能与现代地震活动有直接关联。稳定碳、氧同位素证据表明,现代活动断裂释放的CO_2绝大部分来自地壳深部,并有两种主要的释放机制。现代活动断裂既可以直接产生大量的热动力变质成因CO_2,又可以作为通道释放来自下地壳甚至上地慢的CO_2组分。连续监测深源CO_2的释放动态有可能获得反映震源物理化学变化的地震前兆信息。

The CO_2 Discharges and Sources in the Area of the Boundary Faults of the Sichuan-Yunnan Block

A large number of the CO2 springs occur in the area of the boundary faults of the Sichuan-Yunnan block and the neighbourhood, and the distributions of these springs are about the same with the epicenter distributions of the strong earthquakes since 1900. It indicates that the CO2 discharges could be related to the modern seismic activity in that area. The evidences of stable carbon and oxygen isotopes indicate, the CO2 that was released from the modern active faults is mostly derived from the deep earth crust. And there are two principal discharging mechanisms. The modern active faults are able to produce directly a lot of thermodynamometamorphic CO2 and as well as the CO2 constituent derived from the lower crust or upper mantle could also be released by way of these faults. It is possible to obtain the earthquake precursory informations reflected the physical and chemical changes of the earthquake source by means of continuous monitoring the dynamic changes of the CO2 discharges.