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摘要: 雅安青衣江流域阶地非常发育。通过砾石的岩性、粒度、扁平面的统计，研究区阶地砾石主要来源于青衣江上游地区，在万古场古青衣江流向由北东改为向东，在阳坪现代青衣江流向一致为东南，流速有逐渐减小的趋势。根据阶地测年和阶面相对高程分析，从早更新世至全新世本区至少有7次构造抬升，万古场阶地最大抬升幅度达85 m，最大抬升速率为0.532 mm/a，阳坪阶地抬升幅度最大达到52 m，最大抬升速率为1.25 mm/a。Abstract: The terrace of Qingyi River is very development in Ya’an area. According to lithology, flat surface and granularity of gravel in this area, the gravel root in the upper reach of Qingyi River. The direction of ancient Qingyi River from northeast to east in Wanguchang area in Yangping area, the direction of modern Qingyi River is eastnortheast all the while, the velocity has the tendency which reduces gradually. According to the terraces dating and height above sea level from early Pleistocene to Holocene Epoch, seven times tectonic uplift have taken place in Ya’an area. In Wanguchang area, the biggest uplift scope reaches 85 m,the maximum uplift rate is 0.532 mm/a; in Yangping area ,the biggest uplift scope reaches 52 m,the maximum uplift rate is 1.25 mm/a.
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Key words:
- Qingyi River /
- terrace /
- gravel /
- dating /
- tectonic uplift
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