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本文采用Ｘ射线分析研究三江平原河湖相沉积物发育的一个剖面。结果表明，耕层（０～１６ｃｍ）和白浆层（１６～３６ｃｍ）粘土矿物组成较为接近，主要矿物为水化云母，次要矿物为蒙脱石、蛭石和高岭石，淀积层（３６～１００ｃｍ）主要矿物为蒙脱石、水化云母，次要矿物为蛭石和高岭石。从蒙脱石的高移动性及其在淀积层中的富集来看，蒙脱石可能是白浆土成上过程中粘粒淋溶的主要成分。
In this paper, a section of the sediments of rivers and lakes in the Sanjiang Plain was studied by X-ray analysis. The results show that the composition of clay minerals in the top layer (0 ~ 16cm) and the white pulp layer (16 ~ 36cm) are close to each other, the main minerals are hydrated mica, the minor minerals are montmorillonite, vermiculite and kaolinite, 36 ~ 100cm) The main minerals are montmorillonite, mica hydration, the secondary minerals are vermiculite and kaolinite. In view of the high mobility of montmorillonite and its enrichment in sedimentary layers, montmorillonite may be the main component of clay leaching in the process of formation of albite.