地质通报2017，Vol.36Issue(7)：1251-1258,8.
北京西山大石河山峡阶地发育特征
Terrace development characteristics of Dashi River val?ley in Western Hills of Beijing
摘要
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.关键词
大石河/阶地/纵比降/ESR测年/北京西山Key words
Dashi River/terrace/longitudinal river slope/ESR dating/Beijing Western Hills分类
天文与地球科学引用本文复制引用
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,2017,36(7):1251-1258,8.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) （编号:12120113012000）
