山东东营凹陷新生代天文地层表简介A BRIEF INTRODUCTION TO THE CENOZOIC ASTROSTRATIGRAPHIC TIME SCALE FOR THE DONGYING DEPRESSION,SHANDONG
姚益民,徐道一,张海峰,韩延本,张守鹏,尹志强,李保利,何青芳,边雪梅
摘要(Abstract)：
综合山东东营凹陷郝科1等6口井的天文地层研究结果提出"东营凹陷新生代天文地层表",表中列出的是"国际地层表(2004)"、"中国区域年代地层表(2000)"和0—65Ma期间天文偏心率405ka周期编号以及东营凹陷孔店组(顶部)至平原组各组的年龄以及东营凹陷新生代51Ma以来3个大的地层不整合:1)沙河街组二段下部,大约33.8—33.4Ma期间405ka周期振幅不明显、100ka周期较强,与南大西洋33.4—33.7Ma和热带太平洋33.6—33.7Ma期间沉积物中显著转折等特征可作对比;2)东营组-馆陶组界线上下,东营组三角洲顶面最后萎缩时间约为24.467Ma,推测由此至渐新世末(23.03Ma),大约近1.5Myr期间本区没有大的湖泊,而是冲积—河流相沉积,中新世初(23.03Ma)快速隆起,直到约18—16Ma开始馆下段的上部沉积,这一区域性角度不整合面形成大约持续5—7Myr;3)上新统-更新统界线上下,根据本区东辛2-4井古地磁和天文地层研究,测出布容、松山、高斯和吉尔伯特等4个极性时,求出2.546Ma—1.806Ma期间[明上(上)亚段顶]可能沉积并剥蚀过的地层厚度为129m;1.806—0.908Ma期间,因构造活动本区上升成为高山,第四系平一段底部形成了大的不整合面。
关键词(KeyWords)： 天文地层;不整合;古近系;新近系;第四系;东营凹陷;山东
基金项目(Foundation): 中石化“东营凹陷成烃成藏定量研究”课题;; 国家自然科学主任基金项目(No40542007)资助
作者(Author): 姚益民,徐道一,张海峰,韩延本,张守鹏,尹志强,李保利,何青芳,边雪梅
DOI: 10.19839/j.cnki.dcxzz.2007.s2.002
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