摘要
平泉地区中侏罗世土城子组为内陆干旱气候条件下巨厚的红色碎屑岩沉积,自下而上可分为4段。底部第一段沉积期为冲积扇沉积体系;第二段为湖泊沉积体系;第三段演化为河流体系;第四段为冲积扇、河流体系的复合型。上述充填序列反映了土城子组沉积时盆地依次经历了初始沉降—湖盆扩张—盆地萎缩3个演化阶段。
The Middle Jurassic Formation in the Pingquan basin is a very thick sequence of red detrital rocks formed under inland dry climatic conditions.From below upward the sequence can be divided into four lithological members;the first member at the base is mainly marked by an alluvial fan depositional system,the second member is a lake depositional system,the third member is a river system,and the fourth member is a composite alluvial fan and river system.The above filling sequence reflects that at the time of deposition of the Tuchengzi Formation the basin experienced three evolutionary stages,i.e.:incipient subsidence,lake basin spreading and basin contraction.
出处
《中国地质》
CAS
CSCD
2003年第3期281-285,共5页
Geology in China
基金
国土资源部1:5万平泉县幅
杜岱营子幅
榆树林幅区域地质调查项目资助。
关键词
河北
平泉地区
土城子组
沉积体系
盆地演化
Pingquan area
Touchengzi Formation
depositional system
basin evolution.
