早白垩世陆相九佛堂阶的重新厘定及其层型剖面  

Review on terrestrial Jiufotangian Stage of the Lower Cretaceous and its stratotype

作　　者：田树刚[1] 牛绍武[2] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国地质调查局天津地质矿产研究所,天津300170

出　　处：《地质通报》2010年第2期173-187,共15页Geological Bulletin of China

基　　金：国家自然科学基金项目<侏罗系-白垩系界线过渡期大北沟阶至义县阶连续剖面及化石分带研究>(批准号:40472019);全国地层委员会项目<中国主要断代地层建阶研究>(编号:200113900076)联合资助

摘　　要：通过实测冀北滦平梁根村-东沟村九佛堂组剖面,并在开展多学科系统研究的基础上,把剖面划分为3个岩性段,建立了系统的叶肢介生物地层6个组合,进行辽西九佛堂组—沙海组与冀北滦平九佛堂组的等时性对比;分析剖面的沉积相叠置特征,证明了剖面的沉积连续性和沉积旋回性变化,识别出剖面的3个浅湖相三级层序,重新厘定九佛堂阶的定义及其单位、界线层型。建议将"沙海阶"并入九佛堂阶,单位和界线层型定在冀北滦平盆地西北部梁根村-东山村之间;底界以叶肢介Eosesthe-ria fuxinensis和E.jiufotangensis的首现为标志。A terrestrial stratotype of the Jiufotangian stage has been erected by studying on systematically the Lianggen Village - Donggou Village strato-section, Luanping, northern Hebei. According to standard of a stratotype erected, many courses and methods have been carried out, i.e dividing the section into three lithologic units, erecting conchostracan biostratigraphic six assemblages, chronologically correlating between the Jiufotang-Shahai Formation of western Liaoning and the Jiufotang Formation of northern Hebei, analyzing sedimentologic environments and cycle variations, distinguishing three 3-tier degree sequences of the shallow-lake facies, and redefining the unit and boundary of Jiufotang Stage. Therefore it＇s suggested that the Shahai Formation should be incoperated into the Jiufotang Formation, and the unit and boundary strato-types of the Jiufotangian should be set in between Lianggen Village and Donggou Village, nouthwestem Luanping basin, and the occurrence of conchostracan Eosestheriafuxinensis and E. jiufotangensis should be regarded as the indication of the bottom boundary.

关 键 词：九佛堂阶 陆相层型 早白垩世 滦平盆地 

分 类 号：P534.53[天文地球—古生物学与地层学]