Strain localization bands are often observed in natural and experimentally deformed porous rocks in stress state of the transitional regime, from brittle faulting to cataclastic (or ductile) flow. The rock samples used in most of the previous studies were natural porous coarse sandstones. Meanwhile, fine-grained aggregates originating from powders were used as an initial sample for high-pressure coaxial deformation experiments. Generally, compaction for sintering these aggregates were performed before the experiments. No coaxial experiments have been performed the compaction of the powder under high pressure and low temperature during experiments (cold pressing). This stress state during sintering is close to the transitional regime from brittle faulting to cataclastic flow, hence, there is a possibility that compaction bands which are a type of strain localization bands may form at the cold-pressing stage of deformation in laboratory experiments. We conducted cold pressing experiments on the powder of fine-grained germanate olivine and pyroxene with approximately 30% porosity using a Griggs type apparatus. The experiments reveal that compaction bands form in the compacted and sintered sample. Microstructural analysis revealed that grains with a high dislocation density rotate and crush with shear strain concentration during compaction. At the end of the compaction, the grain size becomes small and bands are made of fine-grained material.

在从脆性断层到碎裂（或延性）流的过渡状态应力状态下，在天然和实验变形的多孔岩石中经常观察到应变局部化带。以往研究中使用的岩样大多为天然多孔粗砂岩. 同时，来自粉末的细粒聚集体被用作高压同轴变形实验的初始样品。通常，在实验之前进行用于烧结这些聚集体的压实。在实验（冷压）期间，没有在高压和低温下进行粉末压实的同轴实验。烧结过程中的这种应力状态接近于从脆性断层到碎裂流的过渡状态，因此，在实验室实验中，有可能在变形的冷压阶段形成压实带，这是一种应变局部化带。我们对细粒锗酸盐粉末进行了冷压实验使用 Griggs 型设备测量具有约 30% 孔隙率的橄榄石和辉石。实验表明，在压实和烧结的样品中形成压实带。微观结构分析表明，在压实过程中，具有高位错密度的晶粒随着剪切应变集中而旋转和破碎。在压实结束时，晶粒尺寸变小，条带由细粒材料制成。