Terrace development characteristics of Dashi River valley in Western Hills of Beijing
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摘要:
大石河山峡总体上阶地较发育，阶地类型以基座阶地为主。下游陈家台-红煤场一带1~4级阶地发育较全，上游至庄户台一带，阶地数量减少，仅见一级阶地。上游沉积物多为砾石，砂、粘土等含量较少；而至下游，沉积物中砂、粘土组分的含量增加。红煤厂四级阶地棕红色泥质含砾粉砂中获得ESR年龄567±56ka，显示大石河河谷在第四纪中更新世早期初始发育，由于新构造运动产生间歇性隆升，在高位宽谷之下发育4级阶地，形成了如今的地貌特征，对比得出大石河流域辛开口至龙门台一段（山区）平均比降为7.71‰，600ka以来，大石河流域山区隆升速率为0.96mm/a。
Abstract:Terrace is developed in Dashi River valley. It is mainly bed rock seated terrace. The first to fourth terraces are relatively well developed from Chenjiatai to Hongmeichang in lower reaches. Only one terrace is seen in upstream Zhuanghutai Village. The sediments are mainly gravels and sands in upstream reaches. They are sands and clays in lower reaches. The dating of fourth terrace in Hongmeichang Village yielded an age of 567±56ka, suggesting that the Dashi River was formed in Mid-Pleistocene. The four terraces were formed by uplift of New Tectonic Movement. The longitudinal river slope is 7.71‰ from the river mouth of Xinkaikou Village to Longmentai Village in upstream reaches. Since 600ka, the Hill in Dashi River valley has been uplifted by 0.96mm/a.
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Key words:
- Dashi River /
- terrace /
- longitudinal river slope /
- ESR dating /
- Beijing Western Hills
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表 1 Diagram of the longitudinal river slope in Dashi River valley
Table 1. Analytical results of samples
实验
室号野外号 样品
物质U
/10-6Th
/10-6K2O
/%含水量
/%古剂量
/Gy年剂量
/（Gy· ka-1）年龄
/ka15272 DS005-ESR-01 泥质含砂物质 2.46 12.3 2.68 4.90 2268±226 4.00 567±56 
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[1] 邓皓匀, 吴胜和.永定河沉积特征研究[J].地质与资源, 2013, 22(2):142-147. http://www.cnki.com.cn/Article/CJFDTOTAL-GJSD201302014.htm
[2] 闫永旺.北京市山区河道治理工程设计的体会[J].水利规划与设计, 2013, (1):15-17. http://www.cnki.com.cn/Article/CJFDTOTAL-SLGH201301007.htm
[3] 鲍亦刚, 刘振锋, 王世发, 等.北京地质百年研究[M].北京:地质出版社, 2001.
[4] 吕金波, 李伟.北京地区新生界研究史[J].北京地质, 2000, 12(1):1-7. http://www.cnki.com.cn/Article/CJFDTOTAL-JBDZ200001000.htm
[5] 吕金波.北京西山古地理环境的演变[J].河北地质学院学报, 1994, 17(3):228-235. http://www.cnki.com.cn/Article/CJFDTOTAL-HBDX403.001.htm
[6] 袁铃声, 曹伯勋, 田明中, 等.北京市房山区大石河下游上更新统洞穴堆积与地表沉积对比[J].中国区域地质, 1993, 12(2):107-112. http://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD199302001.htm
[7] 梁兴中, 高钧成.断裂成矿年龄的α石英ESR研究[J].矿物岩石, 1999, 19(2):69-71. http://www.cnki.com.cn/Article/CJFDTOTAL-KWYS902.014.htm
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