| 中国北部新第三纪红层划分的岩石学标志及其意义 |
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| 引用本文： | 张云翔,岳乐平,陈丹玲,薛祥煦.中国北部新第三纪红层划分的岩石学标志及其意义[J].地层学杂志,1997(1). |
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| 作者姓名： | 张云翔 岳乐平 陈丹玲 薛祥煦 |
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| 作者单位： | 西北大学地质系新生代地质与环境研究所 |
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| 摘 要： | 广布于我国北方的新第三纪红层多由中新统保德组和上新统静乐组组成，这两个组岩性相似，一般情况下难以区分。地层结构详细研究显示，两组中钙质结核赋存方式相差很大，前者呈层状产出，后者为星散状，地层形成时古气候条件的差别是导致该现象的主要原因。由于大气状况具有区域性特点，因而这一地层划分标志具有特定的地质意义及在大面积内具实用的价值
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| 关 键 词： | 上第三系，静乐组，保德组，地层划分，标志，古气候 |
Petrographic marks for stratigraphic division of the Neogene Red Clay in North China and their significance |
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| Zhang Yunxiang,Yue Leping,Chen Danling,Xue Xiangxu.Petrographic marks for stratigraphic division of the Neogene Red Clay in North China and their significance[J].Journal of Stratigraphy,1997(1). |
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| Authors: | Zhang Yunxiang Yue Leping Chen Danling Xue Xiangxu |
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| Abstract: | The earth sediments called Baode Formation or “ Hipparion Red Clay”are well developed in Shaanxi,Shanxi, Gansu,etc.It may be subdivided into two stratigraphic units,namely,Baode Formation(or Lantian Formation)(Upper Miocene)and Jingle Formation(Pliocene).The features of the fossil assemblages in the Formations are quite different.They have been regarded as one unit “ Hipparion Red Clay” and have seldom been subdivided since the Jingle Formation was set up because no interruption of sedimentation was observed them.Few fossils were found in the Jingle Formation.Both of two Formations were composed of purplish,pink red clay,silty clay with abundand carbonate nodules.The major differences between the two Formations are as follows:(1)the carbonate nodules in the strata occurs as nodule layer in the Baode Formation and as scattered specks or net veined form in the Jingle Formation; (2)the stratigraphic structures are different,the former shows the feature of layered structure and the latter shows the massive one; (3)the geomorphic features are diffierent,the former often exixts as precipitous because of the great resistance to weathering of nodule strum,but the latter generally forms the smooth relief; (4)the colors of the sediment between the two Formations are also different,the Jingle Formation essentially is fresh red and the pale yellow is the main color in the Baode Formation.All of differences mainly resulted from the different occurrence of the carbonate nodules in two Formations.As the characteristic mark of earth sediments,carbonate nodules may well correlate with climatic condition and ground water.The existence and the distributing feature of carbonate nodules have a certain geological significance. |
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| Keywords: | petrographic marks stratigraphical division Hipparion Red Clay Jingle Formation Baode Formation Neogene |
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