| 甘肃省的白垩系 |
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| 引用本文： | 宋杰己.甘肃省的白垩系[J].甘肃地质学报,1993(Z1):1-49,134. |
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| 作者姓名： | 宋杰己 |
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| 作者单位： | 甘肃地矿局地调队 酒泉 |
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| 摘 要： | 依据地层区划分原则,将省内白垩系划分为北山、走廊、潮水、祁连、兰州、陇东、西秦岭区7个地层区和酒泉、武威、六盘山、陕甘宁盆地4个地层分区;分别建立了老树窝群、新民堡群、庙沟群、河口群、志丹群、六盘山群、东河群、金刚泉群、马莲沟群、民和组10个群级岩石地层单位;详述了各建群、组的代表剖面;以“热河动物群”、茹福德蕨-拟金粉蕨植物群存在的最低层位的新民堡群、志丹群及与其相当地层的底界,确立为白垩系的底界。以含具冠女星介生物组合的民和组的顶界为白垩系的顶界;按地层区总结了生物组合特征,并与国内外有关生物组合进行了对比,以此确定了省内白垩系的时代。
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| 关 键 词： | 白垩系 地层划分与对比 古生物群特征与对比 岩相古地理 |
CRETACEOUS SYSTEM IN GANSU |
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| Song Jieji.CRETACEOUS SYSTEM IN GANSU[J].Acta Geologica Gansu,1993(Z1):1-49,134. |
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| Authors: | Song Jieji |
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| Institution: | Song Jieji(Jiuquan Geological Survey Team,Geology and Mineral resource Bureau of Gansu Jiuquan 735009) |
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| Abstract: | According to the principle of stratigraphic provincialism,Cretaceous System in Gansu may be divided into seven regions:Namely ,Beishan region ,Chaoshui region, Corridor region,Qilian region,Lanzhou region,Longdong region,Xiqinling region and,four subregion,namely,Jiuquan sub -region,Wuwei sub -region, Liupanshan basin Ysub -regiony and Shanganning basin sub - regio All of which said above established respectively ten stratigraphic unit, viz, Laoshuwo Group, Xinminbao Group, Miaogou Group, Hekou Group, Zhidan Group , liupanshan Group, Donghe Group,Jinganquan Group,Maliangou Group and Minhe Group. Described in detail the representative profile of groups and formations. Established that the Lowest horizon of bearing "Iheho fauna"and Ruffordia - Onychiopsis flora,which is also bottom boundary of Xinminbao Group ,Zhidan Group and corresponding stratum, is bottom boundary of Cretaceous system; and the top boundary of Minhe formation with Taricypridea biocommunity is the top boundary of Cretaceous. Concluded the feature of biocommunity of each stratigraphic region. Corrlated the biocommunity and biocommunity concerned of home and aboard. In accordance with the result of the corrlating,it is determined Cretaceous System. |
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| Keywords: | Cretacenosis system Stratigraphic division and correlation Paleoeoenosis signature and correlation Lithofacies and paleogeography |
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