Deformation and transport processes in halite: a microtectonics study

本研究旨在通过微构造分析，定量研究中欧盆地盐的变形和流体输运史。研究人员将结合伽玛装饰薄片的透射光显微镜、抛光和化学蚀刻样品的亚晶粒尺寸古厚度测定法、扫描电镜和微探针的晶界结构和微观化学分析，以及使用带聚焦光束的x射线衍射仪和二维探测器的x射线定向成像等新技术来研究岩盐样品。我们将通过对德国和波兰盐矿中暴露的地下结构的详细研究来验证该方法。然后，将该方法应用于中欧盆地岩心盐样，获得变形历史、力学性质、古应力、再结晶和流体运移等信息。该项目的长期目标是提供中欧盆地蒸发岩的机械特性和运输过程的定量模型，将结果与SPP中其他项目的结果相结合，并为大规模的基于过程的模型提供输入，这是schwerpunktprogram的最终目标。

This study is aimed at quantifying the deformation and fluid transport history of salt from the Central-European Basin, by mircrotectonic analysis. Halite samples will be studied by integrating the novel techniques of transmitted light microscopy of Gamma- decorated thin sections, subgrain size paleopiezometry of polished and chemically etched samples using reflected light microscopy, analysis of grain boundary structure and microchemistry by SEM and micropobe, and X-ray orientation imaging using an X-ray diffratometer with a focussed beam and a 2D detector. We will validate the method with a detailed study of well-documented underground structures exposed in salt mines in Germany and Poland. Then the method will be applied to salt samples from drillcores from the Central-European Basin, to derive information on the deformation history, mechanical properties, paleostress, recrystallization, and fluid transport. Long-term aim of the project is to provide a quantitative model of the mechanical properties and transport processes in the evaporites of the Central European Basin, integrate the results with those of other projetcs in the SPP, and provide input for the large-scale, process-based model which is the final goal of the Schwerpunktprogramm.