The pelitic mineralogy of the magnetite gneiss and presence of detrital zircon demonstrate that the protoliths were not a pure chemicalsediment.
磁铁矿片麻岩的泥质矿物特征和碎屑锆石的存在表明，原岩不是一个纯化学沉积体。
2
The result of the laboratory analysis of the lacustrine chemicalsediment samples from Dongdagou in the Datong Basin shows that the chemical matter is a hydromagnesite.
大同盆地东大沟湖成化学沉积物样品的实验室分析结果表明，该化学物质是水菱镁矿。
3
The advantages and disadvantages of the catalysts prepared by rapid quenching method, chemicalsediment method, and chemical reduction impregnation method were discussed.