东海陆架盆地西南部中生代地层的发现

东海陆架盆地福州凹陷的中生代地层发育较全 ,分布较广泛 ,而且夹有滨海相地层 ,但曾解释为第三纪地层。根据岩性及孢粉 ( Cyathidites- K lukisporites- Dictyophyllidites,Classopollisannulatus- Schizaeoisporites- Exesipol-lenites tumulus)组合 ,介形类 ( Eucypris?sp.,Metacypris sp.)形态的分析对比 ,可与我国东部、尤其是浙闽等地的同年代地层相比拟。结合同位素绝对年龄测定数据、地震反射界面性质和倾角测井等项资料 ,自下而上建立福州组、渔山组和闽江组 ,依次划归下—中侏罗统 ,上侏罗统—下白垩统和上白垩统。

The Discovery and Division of the Mesozoic Strata in the Southwest of Donghai Shelf Basin

The Mesozoic strata containing some littoral layers are well developed in the Fuzhou sag of Donghai shelf basin. They were considered as of Tertiary age before drilling. According to the analysis and contrast of lithology and sporo pollen ( Cyathidites Klukisporites Dictyophyllidites, Classopollis annulatus Schizaeoisporites Exesipollenites tumulus) assemblages and the morphological feature of ostracodes ( Eucypris? sp., Metacypris sp.), we think that they can be analogous to the strata of the same age in East China, especially in the areas of Zhejiang and Fujian. Based on the isotopic dating, property of seismic reflections and diplog data, we divide it in ascending order into the Fuzhou, Yushan and Minjiang Formations, respectively belonging to Lower-Middle Jurassic, Upper Jurassic-Lower Cretaceous and Upper Cretaceous series.