The different degassing behaviour of upper mantle-derived fluids in the western Eger rift area - a contribution to find an optimal ICDP location

该项目有三个目标：（i）从流体研究的角度协助选择埃格裂谷中合适的ICDP位置，（ii）评价切布盆地下活跃岩浆过程的演化，（iii）评估Počatky Plesná（PPZ）和Mariánské Láznderichia（MLF）断层相关渗透性利用扩散脱气结构（DDS）参与的沿两个断层结构沿着的脱气速率来确定断层。自项目开始以来，具有次大陆地幔氦同位素特征的脱气位置区域已从Bublák扩展到Hartoušov。结果作为一个整体确定PPZ南部目前最活跃的部分的切布盆地。Plesná泉最新的3 He/4 He比值反映了向北隐伏岩浆作用的进一步时空演化。1993年至2007年期间，Bublák周围的上地幔来源的氦部分上升，气体流量率沿着脱气区增加，表明一个长期持续的活跃岩浆过程。实际的地球动力学情况提供了一个独特的机会，以找出大陆裂谷系统内不同的构造环境，岩浆运动和发生震群地震活动之间的重要联系。

The project follows three aims: (i) to assist the selection of an adequate ICDP location in the Eger rift from the sight of fluid research, (ii) to evaluate the evolution of the active magmatic process beneath the Cheb basin, (iii) to assess the fault related permeability of the Počatky Plesná (PPZ) and the Mariánské Lázně (MLF) faults using the degassing rate along both fault structures by involvement of the diffuse degassing structures (DDS). Since the beginning of the project the area of degassing locations with subcontinental mantle helium isotope signature has extended from Bublák to Hartoušov. The results as a whole identify the southern part of the PPZ as presently most active section of the Cheb basin. The latest 3He/4He ratios of the Plesná spring depict the further temporal and spatial evolution of the hidden magmatic process to the north. The rising upper mantle-derived helium portions and the increase of the gas flux rate along the degassing areas in the surroundings of Bublák between 1993 and 2007, point to a long lasting active magmatic process. The actual geodynamic situation offers the unique chance to find out significant links between different tectonic environment, magma moving and occurring earthquake swarm seismicity within a continental rift system.