Major and trace elements of the saline fluids at the Outokumpu deep drilling site - the role of the hydrolysis of rocks and of fluid inclusions

深盐水流体是克拉通的共同特征。芬兰已经在Outokumpu完成了新的研究钻孔，这是国际大陆钻探计划批准的一个项目，其目的之一是了解斯堪的纳维亚盾的深层盐水流体的来源、流动动力学、化学成分和演化以及生物圈。这个拟议的项目包括一个工作包，该工作包经奥托昆布研究小组同意，通过研究两种可能的流体来源的参与和相对重要性来完成整个项目。一个来源可能是由于流体包裹体的泄漏，其中的原位痕量和主要元素组成将被激光icp - ms分析。额外的流体包裹体指纹图谱，即氧和碳同位素将通过在线热解-气相色谱-质谱联用技术进行测定。化学特征和显微测温数据将用于获得流体包裹体的起源和物理化学条件的信息。作为进一步的来源，岩石矿物的水解将采用扩散池和柱实验在恒温高达90°C的岩心样品上进行研究。这些实验将计算出主要元素和微量元素释放的总速率常数。

Deep saline fluids are a common feature of cratons. One aim of the new, already completed Finnish research borehole at Outokumpu, which is an approved project of the International Continental Drilling Program, is the understanding of sources, flow dynamics, chemical composition and evolution, and the biosphere of deep, saline fluids of the Scandinavian shield. This proposed project consists of a work package, which is agreed between the Outokumpo research group, to the overall project by studing the involvement and relative importance of two possible fluid sources. One source may be due to the leakage of fluid inclusions, of which in-situ trace and major element compositions will be analysed by Laser-ICP-MS. Additional fluid inclusion fingerprints, namely oxygen and carbon isotopes will be determined with the aid of a coupled online-pyrolysis-GC-MS technique. The chemical characteristics together with micro-thermometry data will be used to gain information on the origin and physico-chemical conditions of the fluid inclusions. As a further source, the hydrolysis of the rock minerals will be investigated employing diffusion cells and column experiments at constant temperatures up to 90°C on cored samples. Overall rate constants of the release of major and trace elements will be calculated from those experiments.