| 早白垩世陆相九佛堂阶的重新厘定及其层型剖面 |
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| 引用本文： | 田树刚,牛绍武.早白垩世陆相九佛堂阶的重新厘定及其层型剖面[J].地质通报,2010,29(203):173-187. |
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| 作者姓名： | 田树刚 牛绍武 |
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| 作者单位： | 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 |
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| 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Eosestheria fuxinensis和E. jiufotangensis 的首现为标志。
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| 关 键 词： | 九佛堂阶 陆相层型 早白垩世 滦平盆地 |
Review on terrestrial Jiufotangian Stage of the Lower Cretaceous and its stratotype |
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| TIAN Shu-gang,NIU Shao-wu.Review on terrestrial Jiufotangian Stage of the Lower Cretaceous and its stratotype[J].Geologcal Bulletin OF China,2010,29(203):173-187. |
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| Authors: | TIAN Shu-gang NIU Shao-wu |
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| Institution: | 1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China |
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| Abstract: | 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 re-defining 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, nouthwestern Luanping basin, and the occurrence of conchostracan Eosestheria fuxinensis and E. jiufotangensis should be regarded as the indication of the bottom boundary. |
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| Keywords: | Jiufotangian Stage terrestrial stratotype Lower Cretaceous Luanping basin |
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