Discovery and Geological Significance of Red Clay in the Liulin Section in the West Part of Lüliang Mountains
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摘要: 在位于吕梁山西部山前山西柳林卫家洼红粘土层下部发现了一套特殊的水成砂砾层，组成该砂砾石层的碎屑主要是红粘土团块及钙质结核。沉积学的研究表明红粘土和钙质结核碎屑具有不同程度分选性和磨圆度，作为碎屑的钙质结核不再具有不规则的“生姜”状外形而呈典型的圆状或次圆状，这是经过搬运碎屑的典型特征。垂向上自下向上变细的沉积序列，部分层位中埋藏有动物化石都是典型水成堆积物的特征。磁性地层学研究表明其形成于8 Ma前。这种特殊水成堆积物的发现可为红粘土的成因解释提供新资料。
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关键词:
- 红粘土古地磁测年吕梁山柳林
Abstract: A special aqueous gravel bed, which underlies the red clay and is mainly composed of red clay lumps and calcium nodules, was found at Weijiawa village of Liulin county in the west part of Lüliang Mountains. Sedimentological study shows that the clast（composed of the red clay and calcium nodule） in this bed are all with certain sorting and roundness, The calcium nodules did not show the anomalous ginger shape but process typical round or subround character, which is the product of fluviatile transport. Both sedimentary sequence's fining upward and fossil in certain beds are all typical features of aqueous deposit. The clast (red clay and calcium nodule) in the section indicate that some red clay deposited before the aqueous sediments. Magnetostratigraphic result reveals that the aqueous gravel bed is aged about 8.1Ma. The discovery of the special aqueous gravel bed can provide new information for the cause of red clay.-
Key words:
- red clay
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