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

深层盐水是古龙的一个共同特征。芬兰在奥托昆普新完成的研究钻孔是国际大陆钻探计划的一个核准项目，其目的之一是了解斯堪的纳维亚地盾深层含盐流体的来源、流动动力学、化学成分和演变以及生物圈。这个拟议的项目包括一个工作包，这是Outokumpo研究小组之间商定的，通过研究两个可能的流体来源的参与和相对重要性的整体项目。一个来源可能是由于流体包裹体的泄漏，其中原位微量元素和主要元素成分将通过激光ICP-MS进行分析。附加的流体包裹体指纹，即氧和碳同位素将借助耦合的在线热解-GC-MS技术来确定。利用流体包裹体的化学特征和显微测温数据，可以获得流体包裹体的成因和物理化学条件的信息。作为另一个来源，将在高达90°C的恒温下对取芯样品进行扩散池和柱实验，研究岩石矿物的水解。将根据这些实验计算主要和微量元素释放的总体速率常数。

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.