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摘要: 广西横县六景火车站南侧，角度不整合覆盖下泥盆统莫丁组和那叫组下段、被新近系大面积覆盖而呈两部分远距离割裂状态的一套“二元结构”特征显著的红色泥砂基底碳酸盐岩粗—巨砾岩，长期以来未被学者们看作一个冲积扇的有机统一体进行研究。经两次实地踏勘、系统采样和测量，以现代山麓冲积扇鉴别特征为主，辅以古冲积扇特征，综合分析得出结论：该套沉积的系列相关分割露头分别为一古近纪冲积扇之残存扇根、扇中及扇缘。该冲积扇为一典型的古近纪早期干旱气候条件下、母岩区为陡峻碳酸盐岩山体的古山麓冲积扇。Abstract: Matrixsupported carbonatite boulders and pebbles were discretely cropped out to the northeast of Liujing town, where they unconformably overlie the Lower Devonian Moding and Najiao Formations, in which dual textures are well exhibited. Few attentions have been paid to the alluvial fan deposits ever since they were noticed. After careful examination on the coarse deposits, in comparison with the modern and ancient alluvial fan analogues, these discrete red coarse deposits are proposed as the remains of different parts of one Paleogene piedmont alluvial fan, sourced by the carbonate hinterland under a dry climate.
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Key words:
- Guangxi /
- Liujing /
- paleogene /
- carbonate conglomerate /
- alluvial fan /
- dry climate
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