摘要
通过对准噶尔盆地腹部13口探井151块样品的古生物分析,由下而上建立了2个侏罗纪大孢子组合,其中八道湾组至三工河组下段大孢子组合以光面和棒刺状纹饰的类型为主,Kuqaia丰富是其主要特点,其时代为早侏罗世;三工河组上段至西山窑组组合中网状和网脊明显突起的类型占主体地位,其时代属于中侏罗世。依据大孢子化石的分布规律和时代讨论结果,结合双壳、植物等门类的划分意见,认为准噶尔盆地早、中侏罗世界线应划在三工河组上、下段之间。
Abundant megaspores were discovered from 13 wells in hinterland of Junggar basin. They are grouped into two assemblages, namely Badaowan formation-Lower Sangonghe formation assemblages with abundant fossils of Kuqqia megaspore of Early Jurassic and Upper Sangonghe formation-Xishanyao formation assemblage of Middle Jurassic. Based on the distribution and existing era of these two assemblages, integrated with plants and bivalve fauna classification, this paper suggests that the boundary of Early Jurassic and Middle Jurassic should be placed at the contact between the Lower and Upper Sangongbe formation.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2008年第4期488-491,共4页
Xinjiang Petroleum Geology
关键词
准噶尔盆地
侏罗纪
大孢子
地层划分
Junggar basin
Jurassic
megaspore
formation classification
