成都东郊台地晚更新世Q32黏土成因分析
Origin Analysis of the Late Pleistocene Q32 Clay on Eastern Suburb Platform of Chengdu
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摘要: 成都黏土的成因一直以来以风成学说占主要地位，通过对成都东郊台地典型的成都黏土的发育特征、粒度成分、石英颗粒微结构形态进行分析，得到以下结论：成都黏土的地理分布与风成地貌不符；粒度分析显示，占据黏土组分三分之二的小于0.01 mm的成都黏土颗粒不满足风力携带的条件，具有流水搬运的特征。钙质结核的淋滤程度和分布形式反应了成都黏土发育时期的湿润条件，非干燥炎热气候；对化学元素分析，表明成都黏土与西北黄土化学元素的含量与其地域矿产分布相关，成都黏土与西北黄土非同一物源。Abstract: Eolian theory has taken a predominant place on causes of Chengdu clay. This paper analyzed occurrence characteristics, grain size composition and quartz granule microstructure morphology of typical Chengdu clay taken from the platform of the city's east suburb. A contrastive result has demonstrated that the geographical distribution of Chengdu clay and eolian landform was inconsistent. Grain-size analysis showed that taking up two thirds of the clay component and being less than 0.01mm, the particle of Chengdu clay couldn't have been carried by wind; instead, it might be transported by running water. The leaching degree and distribution of calcium nodule showed that the clay was developed in moist environment rather than dry and hot climate. Chemical elements analysis suggests that the element content of both Chengdu clay and loess are related to their regional deposit distributions, and they are originated from different material sources.
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Key words:
- Chengdu clay /
- loess /
- comparative analysis of the characteristics /
- origin analysis
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