| 宝鸡黄土中的风化壳 |
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| 引用本文： | 赵景波.宝鸡黄土中的风化壳[J].地球科学与环境学报,1993(Z2). |
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| 作者姓名： | 赵景波 |
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| 作者单位： | 西安地质学院水工系 710054 |
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| 摘 要： | 根据野外调查,在宝鸡黄土中确定了五个时期的风化壳,它们分别为第1～5层古土壤与其下的风化黄土构成。根据X-射线衍射得知,这些风化壳为水云母和绿泥石等构成的粘土型风化壳。CaCO_3淀积深度和Fe_2O_3、Al_2O_3迁移特征表明第1和3～5层古土壤与其下黄土构成的风化壳发育时处于酸性风化阶段,当时年平均降水量在900mm以上;第2层古土壤与其下风化黄土构成的风化壳发育时处于中性风化阶段,当时年平均降水量为800mm左右。
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| 关 键 词： | 风化壳 古土壤 古环境 |
WEATHERING CRUSTS WITHIN LOESS IN BAOJI |
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| Zhao Jingbo.WEATHERING CRUSTS WITHIN LOESS IN BAOJI[J].Journal of Earth Sciences and Environment,1993(Z2). |
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| Authors: | Zhao Jingbo |
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| Institution: | Xi'an College of Geology |
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| Abstract: | By the field bserving and survying,five weathering crust have been ascertained within loess strata in Bao-ji. According to the difference of weathering sections ,weathering crusts can be divided into two types. One consists of upper paleosoi and lower weathering broken loess without chalybeate film. The other consists of upper paleosol, middle weathering broken loess with chalybeate film and lower weathering loess without chalybeate film.
Based on X - ray diffraction of the samples from the upper part of weathering crusts,we know that the weathering crusts in the loess in Baiji belong; to clay weathering crust in which clay minerals are hydromoca and chlorite. The illuvial depth of CaCO and chalybeate film indicates that the weathering crusts consisting of 1st,3rd,4th and 5th paleosoi and weathering loess underlying then developed under acid condition. The rainfall was about 900mm at that time. The weathering crust consisting of 2nd paleosoi and weathering loess underlying developed under neutral and acid condition,and the rainfall was about 800mm. |
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| Keywords: | Baoji Loess Weathering crust |
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