Characterization of the Campi Flegrei fluid regime in time and space to understand the interplay between fluids/gases and volcanic/seismic processes

本研究旨在调查的气体和流体从Campi Flegrei火山口在深度和在ICDP的Campi Flegrei深钻项目（CFDDP）的框架内在表面上获得新的见解的流体制度的演变在时间和空间，并了解流体之间的相互作用在深度和火山/地震过程以及流体迁移和混合过程。将对气体进行在线地球化学分析：（一）钻探3.5 km深孔期间返回的钻井泥浆;（二）浅井（500 m）;（三）火山气体排放的地表气体。将对所有阶段的气体样品进行稳定同位素和惰性气体同位素分析。在钻井过程中，从返回的钻井泥浆中提取气体，并连续地进行真实的分析，以揭示气体的分子组成和深度分布的信息。对来自离线泥浆气样品的惰性气体和稳定同位素的研究将提供关于这些气体来源的信息。对钻井泥浆气体的研究结果将描述Campi Flegrei空间流体状况。对浅井中的气体和流体进行监测，及时识别流体和气体成分的短期和长期变化，以了解Campi Flegrei岩浆系统的时间演化。对火山气体排放的地球化学监测将有助于评估浅层和深层流体对流体状态的输入以及流体从深度到表面的迁移过程。已经开始对索尔法塔拉火山东外翼皮夏雷利火山口的火山气体进行在线监测。

This study intends to investigate gases and fluids from the Campi Flegrei caldera at depth and at the surface within the framework of the Campi Flegrei Deep Drilling Project (CFDDP) of ICDP to gain new insights into the evolution of the fluid regime in time and space and to understand the interplay between fluids at depth and volcanic/seismic processes as well as fluid migration and mixing processes. On-line geochemical analysis of gases will be performed (i) from returning drill mud during drilling a 3,5 km deep hole, (ii) from a shallow (500m) well and (iii) at the surface from volcanic gas discharges. Stable isotope and noble gas isotope analysis will be conducted on gas samples from all phases. During drilling, gas is extracted from returning drill-mud and continuously analyzed in real time to reveal information on the molecular composition and distribution of gases at depth. Studies of noble gases and stable isotopes from off-line mud gas samples will deliver information on the origin of these gases. Results from studies on drill mud gas will characterize the Campi Flegrei fluid regime in space. The monitoring of gases and fluids from a shallow well identifies short- and long-term variation in the fluid and gas composition in time to understand the temporal evolution of the Campi Flegrei magmatic system. Geochemical monitoring of volcanic gas emissions will help to assess the input of shallow and deep fluids to the fluid regime and migration processes of fluids from depth to the surface. On-line monitoring of volcanic gas from a vent in the fumarole field of Pisciarelli at the eastern outer flank of the Solfatara volcano has already been started.