Procedure is presented for clay coating separation on ancient soft. The sample is first put into water until soil is ful......

本文根据腐化植物体、黄土、古土壤等样品的Ｘ－射线衍射和化学分析等资料。初步认识到植物腐化能够形成多种粘土矿物，腐化过程越长，形成......

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