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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >Simulation experiments for shocked primitive materials in the Solar System
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Simulation experiments for shocked primitive materials in the Solar System

机译：太阳系中原始原始材料的模拟实验

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Shock recovery experiments were conducted on porous mixtures (initial porosity 35 +/- 5%) in silicate-metal and silicate-metal-sulfide systems in an attempt to simulate impact phenomena of unconsolidated porous materials similar to ordinary chondrites in a wide range of shock pressures from 20 to 70 GPa. The textures and chemical compositions of shocked samples were investigated in detail. Features such as grain deformation, fracture density decrease, and heterogeneous meltings are found. At < 30 GPa, mechanical effects of the shock process, such as silicate fracturing and metal elongation, are dominant. Morphological analysis of metal grains in shocked samples reveals good correlation between the degree of deformation and the shock pressure. The metal grain aspect ratio may be a good indicator of shock pressure. At higher pressures, thermal effects, which are enhanced in the shock compression of porous media, become prominent. Above 30 GPa, silicate grain fractures disappear, and silicate darkening dominates. Shock-induced melting in the shock veins and melt networks is observed and interpreted as localized in situ melting features, the heat source of which is frictional heating between grains. Thin veins and melt pockets of sulfide-metal melt are the principal characteristics in this type of sample. Melting features of metal-sulfide systems alter the spectral property of meteoritic bodies. The initial porosity of a target may have been an important factor in impact processes in the early Solar System.
机译：在硅酸盐-金属和硅酸盐-金属-硫化物体系中的多孔混合物（初始孔隙率35 +/- 5％）上进行了冲击恢复实验，试图模拟在大范围的冲击中类似于普通球粒陨石的疏松多孔材料的冲击现象。压力从20至70 GPa。详细研究了冲击样品的质地和化学成分。发现了诸如晶粒变形，断裂密度降低和不均匀熔化的特征。在<30 GPa时，冲击过程的机械效应（如硅酸盐破裂和金属伸长率）占主导地位。冲击样品中金属晶粒的形态分析表明，变形程度与冲击压力之间具有良好的相关性。金属晶粒长宽比可以很好地表明冲击压力。在较高的压力下，通过多孔介质的冲击压缩增强的热效应变得显着。高于30 GPa，硅酸盐晶粒断裂消失，而硅酸盐变黑占主导地位。观察到了在冲击脉和熔体网络中由冲击引起的熔化，并将其解释为局部原位熔化特征，其热源是晶粒之间的摩擦加热。硫化物-金属熔体的细脉和熔体袋是此类样品的主要特征。金属硫化物系统的熔化特征改变了陨石的光谱性质。目标的初始孔隙率可能是早期太阳系撞击过程中的重要因素。

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