【摘要】 通过对龙门山前陆盆地大邑砾岩的发育层序、沉积特征及物源的分析 ,建立其垂向相序 ,总结出大邑砾岩的沉积具冲积扇相的特点 ;恢复大邑砾岩发育时期的古地貌 ,推断其至少由三个冲积扇组成 :古岷江扇 ,古青衣江扇 ,古玉溪扇。同时 ,结合测年资料 ,指出大邑砾岩是上新世 -早更新世的整合沉积相 ,有别于全球其他地区同期的不整合事件。大邑砾岩沉积之后 ,新构造运动活动强烈更多还原

【Abstract】 The Dayi conglomerate is deposited in the foreland basin located in the Longmen mountains of the Tibetan plateau. By analyzing the evolution, stratigraphic sequence development, lithology, sedimentary characteristics and material source in the Chengdu basin, this paper indicates that the Dayi conglomerate bears fluvial facies and alluvial fan sedimentary characteristics. It concludes that the Dayi conglomerate is composed of three main alluvial fans: the ancient Minjiang, Qingyijiang and Yuxi fans. After the Dayi conglomerate deposition, tectonic activities occured frequently. During the Pliocene Lower Pleistocene, the Dayi conglomerate was deposited continuously. It is different from the unconformities in the same time all of the world.更多还原