摘要:
采用扫描电镜、透射电镜和能谱分析研究了浏阳产菊花石的微观组织,发现浏阳菊花石的花瓣保留了原生矿物--天青石SrSO4及其单晶体的外形,但是花瓣内部出现了硅化现象;菊花石中存在多种纳米矿物材料,例如非晶纳米硅氧线、颗粒状纳米CaCO3,和SrSO4、CaCO3的二维纳米片和纳米带等.某些非晶纳米硅氧线外包覆了纳米晶化层,镁含量越高,非晶纳米线越容易晶化.
Abstract:
Chrysanthemum stone is a diagenetic celestite nodule widely distributed in the Permian Chihsia Formation of South China. The microstructure of chrysanthemum stone from Liuyang was studied using scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray energy dispersive spectrometer (EDS). It was found that the petals in chrysanthemum stone from Liuyang retained the original celestite and their rectangular pyramid shape, but silicification was observed in celestite petals. In chrysanthemum stone, there are many types of nanometer minerals, such as amorphous silica nanometer threads, CaCO3 or SrSO4 nanometer grains, CaCO3 nanometer bands and lamellas. Some amorphous silica nanometer threads were enclosed by nano-crystals, which were related to magnesium.
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