南京周家山下蜀黄土石英颗粒特征及其物源意义
发布时间：2019-02-17 16:30
【摘要】：下蜀黄土的成因和物源一直是学术界研究的热点。对南京周家山下蜀黄土的石英粒度和石英表面微结构进行分析,结果显示:粉砂粒级石英颗粒(5~50μm)占绝对优势;20μm组分平均含量为42.76%,30μm组分平均含量为62.98%;粒度分布曲线和累积曲线总体具有颗粒偏细,呈正偏态,分选较差,峰形尖锐,双峰曲线不对称的特征;粒级—标准偏差曲线呈"双峰"分布,两个明显的标准偏差峰值分别出现在7.962 1μm和39.905 2μm。石英颗粒表面形态主要以次棱角状为主;表面机械结构具有丰富的蝶形坑、曲脊、贝壳状断口,部分表面出现平行节理面、V形坑;不同粒级组分表面形态和机械结构特征存在差异。分析表明,南京周家山下蜀黄土属典型风成成因堆积物,是多源区物质高度混合搬运堆积的结果。
[Abstract]:The origin and origin of Xiashu loess has been a hot topic in academic circles. The quartz particle size and quartz surface microstructure of Xiashu loess in Zhoujiashan, Nanjing, were analyzed. The results showed that silt grade quartz particles (5 ~ 50 渭 m) were dominant, and the average content of 20 渭 m component was 42.7630 渭 m, and the average content of 20 渭 m component was 62.98 渭 m. The particle size distribution curve and the cumulative curve have the characteristics of fine particle size, positive bias, poor sorting, sharp peak shape and asymmetric bimodal curve. The grain grain-standard deviation curve showed a "double peak" distribution, and two obvious standard deviation peaks appeared at 7.962 渭 m and 39.905 2 渭 m, respectively. The surface morphology of quartz particles is mainly subangular-shaped, and the mechanical structure of the surface has abundant butterfly pits, curved ridges, shell-like fractures, parallel joints and V-shaped pits on some surfaces. The surface morphology and mechanical structure of different particle size components are different. The analysis shows that the loess in Zhoujiashan, Nanjing is a typical aeolian deposit, which is the result of high mixing transport and accumulation of materials in multi-source area.
【作者单位】： 华东师范大学地理科学学院地理信息科学教育部重点实验室;
【基金】：国家基础科学人才培养基金(J1310028) 国家自然科学基金项目(41371032)~~
【分类号】：S151.9
，
本文编号：2425368
[Abstract]:The origin and origin of Xiashu loess has been a hot topic in academic circles. The quartz particle size and quartz surface microstructure of Xiashu loess in Zhoujiashan, Nanjing, were analyzed. The results showed that silt grade quartz particles (5 ~ 50 渭 m) were dominant, and the average content of 20 渭 m component was 42.7630 渭 m, and the average content of 20 渭 m component was 62.98 渭 m. The particle size distribution curve and the cumulative curve have the characteristics of fine particle size, positive bias, poor sorting, sharp peak shape and asymmetric bimodal curve. The grain grain-standard deviation curve showed a "double peak" distribution, and two obvious standard deviation peaks appeared at 7.962 渭 m and 39.905 2 渭 m, respectively. The surface morphology of quartz particles is mainly subangular-shaped, and the mechanical structure of the surface has abundant butterfly pits, curved ridges, shell-like fractures, parallel joints and V-shaped pits on some surfaces. The surface morphology and mechanical structure of different particle size components are different. The analysis shows that the loess in Zhoujiashan, Nanjing is a typical aeolian deposit, which is the result of high mixing transport and accumulation of materials in multi-source area.
【作者单位】： 华东师范大学地理科学学院地理信息科学教育部重点实验室;
【基金】：国家基础科学人才培养基金(J1310028) 国家自然科学基金项目(41371032)~~
【分类号】：S151.9
，
本文编号：2425368
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