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郑桂森,徐吉祥,吕金波,栾英波,王继明,于春林,张磊.北京西山大石河山峡阶地发育特征[J].地质通报,2017,(7):1251-1258.
北京西山大石河山峡阶地发育特征    点此下载全文
郑桂森1  徐吉祥1  吕金波2  栾英波1  王继明1  于春林1  张磊2
1. 北京市地质矿产勘查开发局, 北京 100195;
2. 北京市地质调查研究院, 北京 100195
基金项目:中国地质调查局项目《北京地区主要活动断裂精细调查与灾害效应调查》(编号:12120113012000)
DOI:
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。
关键词:大石河  阶地  纵比降  ESR测年  北京西山
Terrace development characteristics of Dashi River val-ley in Western Hills of Beijing    Download Fulltext
ZHENG Guisen1  XU Jixiang1  LÜ Jinbo2  LUAN Yingbo1  WANG Jiming1  YU Chunlin1  ZHANG Lei2
1. Beijing Geological Prospecting and Developing Bureau, Beijing 100195, China;
2. Beijing Geological Survey, Beijing 102206, China
Fund Project:
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 terrac-es were formed by uplift of New Tectonic Movement. The longitudinal river slope is 7.71‰ from the river mouth of Xinkaikou Vil-lage to Longmentai Village in upstream reaches. Since 600ka, the Hill in Dashi River valley has been uplifted by 0.96mm/a.
Keywords:Dashi River  terrace  longitudinal river slope  ESR dating  Beijing Western Hills
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