滦平盆地西瓜园组(上侏罗统—下白垩统)暗色泥岩中恐龙脚印化石及其地质意义  

Dinosaur footprint fossils in dark mudstones of the Xiguayuan Formation(Upper Jurassic-Lower Cretaceous) in Luanping Basin and their geological significance

作　　者：纪友亮[1] 孙玉花[2] 贾爱林[3] 

机构地区：[1]中国石油大学(北京),北京102249 [2]同济大学海洋与地球科学学院,上海200092 [3]中国石油勘探开发研究院,北京100083

出　　处：《古地理学报》2008年第4期379-384,共6页Journal of Palaeogeography：Chinese Edition

基　　金：国家973科技攻关项目"中国典型叠合盆地隆坳格局形成演化与岩性地层圈闭发育模式"(编号:2006CB202302)资助

摘　　要：通过对滦平盆地西瓜园组(上侏罗统—下白垩统)暗色泥岩和油页岩的岩相特征及其中所发现的各种恐龙脚印化石的研究,分析了恐龙脚印化石形成的环境。认为在前扇三角洲或深湖—半深湖环境的暗色泥岩中出现恐龙脚印化石,说明湖平面变化频繁,在枯水期,湖平面下降,前扇三角洲或深湖—半深湖相暗色泥岩暴露出水面,一些恐龙经过此处到低洼处喝水,留下脚印。由此推断中国东部古近纪陆相断陷湖盆中的暗色泥岩所夹的砂砾岩和盐岩并不全是深水重力流成因,暗色泥岩所夹的盐岩也不一定是深水成因;并建立了暗色泥岩中所夹的砂砾岩和盐岩的成因沉积模式。By the study of different kinds of dinosaur footprint fossils found in the dark mudstones and oil shales of the Xiguayuan Formation （ Upper Jurassic - Lower Cretaceous） in Luanping Basin and the lithofacies characteristics of the dark mudstones and oil shales, the sedimentary environment of the dinosaur footprint fossils was analyzed. The dark mudstones with dinosaur footprint fossils were deposited in semi-deep lake or front fan delta environments which indicated that the lake level changed frequently. Dur-ing the dry season, the lake level fell, and the dark mudstones in deep lake-semi-deep lake facies exposed to the air. Some dinosaurs went to the lower part of the basin to drink water, and their footprints were left in the dark mudstones. Consequently, it is concluded that all the sandstone conglomerates interlayered in the dark mudstones and the salt rocks in the Paleogene continental faulted basins in eastern China are not formed by deep water gravity flow. The sedimentary models of the sandstone conglomerates and salt rocks interlayered in dark mudstones were established to show their origins.

关 键 词：滦平盆地 西瓜园组 恐龙脚印化石 暗色泥岩 湖平面变化 沉积模式 低位三角洲 

分 类 号：Q911.28[天文地球—古生物学与地层学]