Calabrian Arc Mud Volcanoes: Deep Origin, internal Structure and activity from data acquired during expeditions POS499, POS515, and M112

卡拉布里亚弧泥火山：根据 POS499、POS515 和 M112 探险期间获取的数据得出的深层起源、内部结构和活动

• 批准号: 411262481
• 负责人: Professor Dr. Gerhard Bohrmann
• 金额: --
• 依托单位: Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/411262481?language=en
• 关键词: Calabrian; Arc; Mud; Volcanoes; Deep

Marine mud volcanoes contribute a large portion of the material fluxes between the seafloor and the oceans and due to their high internal dynamics and fast changing morphology, mud volcanoes represent a marine geohazard. In order to investigate the seafloor-manifestation, spatial extent, and temporal evolution of mud volcanism, high-resolution seafloor and sub-seafloor imaging techniques are required. In this proposal we would like to utilize AUV data combined with gravity cores and 2D/3D seismic reflection and ocean bottom seismometer data from already completed expeditions (POS499, POS515, M112) at several mud volcanoes of the Calabrian accretionary prism to investigate the dynamic processes of mud volcanism. The objectives of the studies are on the interactions of geological, physical, and chemical processes at mud volcanoes by observing ongoing changes and reconstructing past evolution in order to improve estimates of mud extrusion and gaseous and dissolved methane emissions with time. Seismic data are used to image the mud volcano structure and roots and are linked to existing data defining a stratigraphic framework over the past 6 Ma. These results are combined with seafloor micro-bathymetry and backscatter from AUV observations, acoustic water column gas flare mapping, and gravity cores defining stratigraphy, expulsion rate, and pore-fluid chemistry. This will yield estimates of total mud extrusion, expulsion rates, and chemical fluxes from depth to seafloor.

海洋泥火山贡献了海底和海洋之间物质通量的很大一部分，由于其内部动力学和快速变化的形态，泥火山是一种海洋地质灾害。为了研究泥火山活动的海底表现、空间范围和时间演化，需要高分辨率的海底和海底下成像技术。在本提案中，我们希望利用AUV数据结合重力岩心和二维/三维地震反射和海底地震仪数据，从已经完成的探险（POS 499，POS 515，M112）在卡拉布里亚增生棱镜的几个泥火山，调查泥火山活动的动态过程。这些研究的目的是通过观察正在发生的变化和重建过去的演变，以改善泥火山的地质，物理和化学过程的相互作用，以改善随着时间的推移泥挤出和气体和溶解的甲烷排放量的估计。地震数据被用来成像泥火山结构和根，并与现有的数据定义在过去的6马的地层框架。这些结果与海底微水深测量和AUV观测的后向散射，声学水柱气体耀斑映射，和重力核心定义地层，排出速率和孔隙流体化学相结合。这将产生对泥浆总挤出量、排出速率和从深度到海底的化学通量的估计。