Deep-seated fluid flow processes, seismic faulting and mud volcanisms in a mature collision zone; The backstop to the Mediterranean Ridge accretionary prism

收敛板块边缘是质量传递过程和构造活动的重要场所。然而，科学的大洋钻探很少对所谓的俯冲工厂进行研究。它包括(I)小环(前缘增积棱柱的特征是大部分脱水)，脚趾后面几十到数百公里处的中间环(无序断层和其他路径将深层物质输送到海洋)，以及(Iii)大环(物质要么在地幔中循环，要么沿着火山弧释放)。中间环路从未被dsdp、dpp或ldp钻探过，只有正在进行的555-Full3提案3涉及东地中海希腊俯冲区(HSZ)的这一区域。克里特岛南部的三个主要断层，都具有极佳的地球物理图像，其中一个被一座活跃的泥火山并列，为流体(和泥浆)从背靠背几公里深上升到增长棱柱提供了证据。为了在SPC排名和OTF时间表中协助这一4*建议，并在将水文学和构造联系起来的俯冲工厂研究中检验一些关键假设，我们提议：-进行一次研究巡航(RV Poseidon)，以在拟议的钻探地点部署流量计，获取重力岩心并收集现场孔压数据，-利用现有的岩土以及地球化学数据，加上在巡航期间和从通量计收集的数据，对在增生杂岩及其腹地(即欧亚大陆和非洲之间的俯冲工厂的中间回路)之间的边界上的流体流动进行数值模拟，以及-将沿活动断裂穿透的物理化学过程与热液实验和长期部署的地球化学发现联系起来。

Convergent plate margins are important locations of mass transfer processes and tectonic activity. However, the so-called subduction factory has rarely been studied by scientific ocean drilling. It comprises (i) the small loop (where frontal accretionary prism is characterised by mostly dewatering), the intermediate loop several tens to hundreds of kilometres behind the toe (where out-of-sequence-faults and other pathways funnel deep-seated material to the ocean), and (iii) the big loop (where material is either recycled in the mantle, or emitted along the volcanic arc). The intermediate loop has never been drilled by DSDP, ODP or lODP, and only active proposal 555-full3 addresses this area in the Hellenic Subduction Zone (HSZ), Eastern Mediterranean. Three major faults south of Crete, all superbly imaged geophysically and one juxtaposed by an active mud volcano, provide evidence for fluid (and mud) ascent from several km depth in the backstop to the accretionary prism. To assist this 4* proposal in SPC ranking and OTF scheduling, and to test a number of critical hypothesis in subduction factory research linking hydrology and tectonics, we propose: - to carry out a research cruise (RV Poseidon) to deploy flow meters, take gravity cores and collect in situ pore pressure data at the proposed drill sites, - to use existing geotechnical as well geochemical data plus those collected during the cruise and from the fluxmeters to numerically model fluid flow at the boundary between the accretionary complex and its hinterland (i.e. the intermediate loop ofthe subduction factory between Eurasia and Africa), and - to relate physico-chemical processes along the active faults to be penetrated to the geochemical findings from hydrothermal experimenls and long-term deployments.