| 贵阳乌当上古生界的海侵—海退层序 |
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| 引用本文： | 毛家仁.贵阳乌当上古生界的海侵—海退层序[J].现代地质,2005,19(1):119-126. |
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| 作者姓名： | 毛家仁 |
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| 作者单位： | 贵州大学,资源与环境学院,贵州,贵阳,550003 |
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| 基金项目： | 中国石油化工股份有限公司重点科技工程项目(NPJ-10019). |
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| 摘 要： | 在位于上扬子古陆边缘的贵阳乌当泥盆纪至石炭纪剖面上, 泥盆系包括蟒山群碎屑岩和高坡场组白云岩, 其中可以识别出 5个三级层序; 石炭系至二叠系船山统包括祥摆组、旧司组、上司组、摆佐组、黄龙组、马平组和梁山组,其中祥摆组和梁山组为含煤碎屑岩系地层, 其余各组为碳酸盐岩地层, 可以划分出 5个三级层序。与贵州南部至广西一带较为完整的泥盆系和石炭系相对比(泥盆系包含 13个三级层序,石炭系至二叠系船山统包含 6个三级层序 ), 贵阳乌当剖面以较薄的地层厚度和较多的三级层序的缺失为特征, 成为间断大于沉积的典型地层代表, 这是由于古陆边缘海退作用的沉积响应大于海侵作用所致。石炭纪与二叠纪过渡时期的大幅度慢速海侵作用改变了这种局面, 同邻区一样研究区域也进入了大片海域发育的时期, 所以阳新统和乐平统的层序大致与贵州南部至广西一带相近, 这是由于与相应的三级海平面上升相关的大幅度慢速海侵作用的结果。
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| 关 键 词： | 海侵—海退层序 上古生界 贵阳乌当剖面 |
| 文章编号： | 1000-8527(2005)01-0119-08 |
| 修稿时间： | 2004年9月7日 |
Transgressive-Regressive Sequences of the Upper Paleozoic at the Wudang Section in Guiyang |
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| Mao Jia-ren.Transgressive-Regressive Sequences of the Upper Paleozoic at the Wudang Section in Guiyang[J].Geoscience——Journal of Graduate School,China University of Geosciences,2005,19(1):119-126. |
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| Authors: | Mao Jia-ren |
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| Abstract: | Located at the oldland margin from the Devonian to the Carboniferous, the Devonian System at the Wudang section includes the Mangshan Group clastic rocks and the Gaopochang Formation dolomites, and can be grouped into 5 third-order sequences.The Carboniferous System to the Permian Chuanshanian Series includes the Xiangbai, the Jiusi, the Shangsi, the Baizuo, the Huanglong, the Maping and the Liangshang Formation,which can be divided into 5 third-order sequences. The Xiangbai Formation and the Liangshan Formation are constituted by coal-measures, the other formations are marked by carbonates. Compared with the coeval strata in the southern part of Guizhou and the Guangxi area that are characteristic of the integrity records of strata (the Devonian System can be divided into 13 third-order sequences and the Carboniferous to the Permian Chuanshanian Series can be grouped into 6 third-order sequences), many third-order sequences from the Devonian to the Permian Chuanshanian Epoch are absent. Therefore, the Wudong section of the Devonian System to the Permian Chuanshanian Epoch is of a typical example that the hiatus is larger than the deposits, which might be resulted from the stronger response of regression than that of transgression. As the result of the large-scale and slow-speed transgression in the transitional period from the Carboniferous to the Permian, the study area together with the adjacent areas became a sea area. This transgression is genetically related to the third-order rise of sea-level changes of the SQ_(19). Therefore, divisions of third-order sequences of the Permian Yangsingian and Lepingian are similar to those in the southern part of Guizhou as well as in Guangxi. |
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| Keywords: | transgressive-regressive sequences the Upper Paleozoic the Wudang section in Guiyang |
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