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断裂带中岩石的硅化现象,通常称之为硅化岩或硅化破碎带,即经动力变质作用的断层岩,通过微束技术对其观察,它们显示出下列特征:在扫描电镜(SEM)下,硅化物质表现为细脉状,而在偏光里微镜下则表现为浸染状;对硅化岩进行组构观察,可见压扁 S 面和剪切 S 面;在透射电镜(TEM)下,可进一步区别不同的位错现象;断裂带岩石的硅化现象是受组成岩石的化学元素的构造地球化学作用所制约的,包括动力分异和化学亲和作用,动热变质作用和退化变质作用,氧化和还原作用以及脱水和水解作用。
The silicification of rocks in the fault zone, commonly referred to as silicified rocks or silicified crustal zones, ie, metamorphic fault rocks, is observed by microbeam techniques and shows the following characteristics: Under scanning electron microscopy (SEM) Silica shows the shape of fine veins, while in the polarized light microscopy shows the disseminated shape; the structure of the silicified rock observation, we can see S flattened and shear S-plane; under the transmission electron microscope (TEM), further Different dislocation phenomena; the silicification of the rock in the fault zone is controlled by tectono-geochemical effects of the chemical elements that make up the rock, including dynamic differentiation and chemical affinity, dynamic thermal metamorphism and degenerated metamorphism, oxidation and Reduction and dehydration and hydrolysis.