Experimental simulation of aqueous alteration in primitive meteorites and characterization by electron microscopy

在酸性和中性条件下对不同铁镁比的橄榄石粉进行了水热蚀变实验，并对实验产物进行了透射电镜观察。在酸性和中性条件下，Fo_（100）合成了发育良好的蛇纹石（纤蛇纹石）管状晶体;在酸性条件下，Fo_（92）和Fo_（80）合成了发育良好的蛇纹石管状晶体。纤蛇纹石的粒度和大小明显取决于橄榄石中的铁含量，即随着铁含量的增加，纤蛇纹石的生成量越来越少，体积越来越小。溶液的酸度对温石棉的形成起重要作用。在酸性条件下处理的Fo 50和Fo 20中，得到了片状和纤维状的层状硅酸盐晶体，可能是蛇纹石，这与CI和CM中的层状硅酸盐最相似。富铁颗粒（推测为铁氢氧化物）的Framboidal聚集体形成从Fa 100和Fo 20，但不是页硅酸盐形成Fa 100。

Hydrothermal alteration experiments of olivine powder with several Fe/Mg rations were carried out under acidic and neutral conditions, and TEM observations were made on the run products. Well-developed tubular crystals of serpentine (chrysotile) were synthesized from Fo100 under both acidic and neutral conditons, and from Fo92 and Fo80 under acidic condition. Abundance and size of chrysotile apparently depend on the Fe contents of olivine, i.e. with increasing Fe contents, less and smaller chrysotile was formed. Acidity of the solution plays an important role for the formation of chrysotile. Platy and fibrous crystals of phyllosilicate, probably serpentine, were obtained from Fo50 and Fo20 treated under acidic condition, which are most similar to the phyllosilicates in the CI and CM chondrites. Framboidal aggregates of Fe-rich grains (Presumably Fe-hydroxide) were formed from Fa100 and Fo20, but not phyllosilicate was formed Fa100.