Morphology of gravels from the Yangluo Formation in the Southern Piedment of Dabie Mountains
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摘要:
阳逻组砾石层分布于大别山南麓长江北岸地区，是长江中游地区一个重要的第四纪地层单位。其成因主要有两种观点：一种观点认为阳逻组砾石层为古长江冲积物，后期经过构造抬升而在长江北岸形成阶地；另一种观点认为其为大别山南麓河流冲积扇。砾石层中的砾石形貌记录了砾石的演化历史，对砾石进行形貌学研究可以用来进行古环境重建。文章选取武汉地区黄陂区横店镇、新洲区阳逻镇附近的25个砾石剖面中的2693颗砾石的外形参数进行测量。其中横店14个剖面中1377颗砾石、阳逻11个剖面中1316颗砾石。Zingg分类显示砾石以扁长形为主，砾石层在Sneed-Folk三角图中的主要分布于过渡相和河流相，砾石层中存在的大量片岩。这些特征均指示阳逻组砾石层是的物源区为大别山地区，它是大别山南麓河流形成的冲洪积扇堆积物。
Abstract:As one of the most important Quaternary strata in the middle reach of Yangtze River, the gravel layers within the Yangluo Formation are distributed in the north bank of the Yangtze River at the southern foot of Dabie Mountains. There are two views on the origin of the gravel layers. One view holds that the gravel layers of Yangluo Formation are alluvial sediments of the Ancient Yangtze River, which formed terraces on the north bank of the Yangtze River after later tectonic uplifting. Another view is that they are the alluvial fans at the southern foot of Dabie Mountains. As gravel's morphology records its evolution, the study of its morphology can be used to reconstruct palaeoenvironment. In our project, 25 gravel layer profiles were chosen to select total 2693 gravels for measurement of morphological parameter, including 1377 gravels from 14 profiles in Hengdian Town and 1316 gravels from 11 profiles in Yangluo Town. Zingg classification shows that most gravel is mainly oblong shape, and it is mainly distributed in the transitional and fluvial facies in the Sneed Folk triangle. There is a large amount of schist in the gravel layer. The morphological characteristics of the gravel layer of Yangluo Formation indicate that it is of alluvial-diluvial fan deposits formed by rivers at the southern foot of Dabie Mountains.
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Key words:
- Yangtze River /
- Yangluo Formation /
- gravel layer /
- provenance /
- morphometric parameter /
- geological survey engineering /
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表 1 本研究中的剖面分布位置及不同剖面砾石统计个数（HD代表横店，YL代表阳逻）
Table 1. The location of gravel layer profiles and the total number of gravels (HD for Hengdian, YL for Yangluo)
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表 3 横店、阳逻两地砾石9个参数的描述性统计结果
Table 3. Descriptive statistics for 9 parameters of gravels from Hendian and Yangluo
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表 5 横店阳逻两地砾石Zingg的外形分类
Table 5. Zingg shape classification of gravels in Hengdian and Yangluo
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表 6 横店、阳逻地区砾石层所反映的沉积环境
Table 6. The sedimentary environment deduced from gravels in Hengdian and Yangluo
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表 7 不同形态砾石个数和占比分布情况
Table 7. The number and percentage for classification of different shapes of gravels
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