摘要
济阳坳陷沾—车凹陷大量的岩石薄片鉴定结果表明,该区新生界古近系沙河街组一段到四段的不同层位中,沉积了丰度不等的原生海绿石矿物;同时在沾化凹陷东部沙河街组四段上部产丰富的枝管藻(Cladosiphonia)化石,并以此形成藻礁灰岩沉积;在此材料基础上,结合已有的相关资料分析认为,研究区沙河街组沉积期间,确实发生了海侵事件,从而为全面认识济阳坳陷盆地的沉积史提供了新的内容。
Restudy of lithological and paleontologic analysis of Zhan-Che Sag in Jiyang depression implies: (1) abundances of primary glauconite are different in the 1st to 4th members the Ceno-zoic Shahejie Formation; (2) reef limestones were found in the eastern part of Zhanhua sag, and Cladosiphonia fossils were found in the top of 4th member of Shahejie Formation; (3) salty water Foraminifera were found through the whole Paleogene; (4) abundant ostracoda fossils were found deposited in the 1st member of Shahejie Formation in Oil well of Gudong 25 before glauconite occurred. These facts further prove that marine transgression happened in this area during the Paleocene.
出处
《高校地质学报》
CAS
CSCD
2003年第3期450-457,共8页
Geological Journal of China Universities
关键词
沾-车凹陷
古近系
海绿石
枝管藻
海侵
Jiyang Depression
Paleogene
glauconite
Cladosiphonia
transgression
