| 湖北省栖霞组沉积环境-沉积旋回及层序地层划分 |
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| 引用本文： | 颜佳新,方念乔.湖北省栖霞组沉积环境-沉积旋回及层序地层划分[J].地球科学,1994,3(5). |
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| 作者姓名： | 颜佳新 方念乔 |
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| 作者单位： | 中国地质大学地质系 武汉430074
(颜佳新)，中国地质大学地质系 北京100083(方念乔) |
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| 基金项目： | 国家基础性研究重大关键项目“中国古大陆及其边缘层序地层和海平面变化研究”资助 |
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| 摘 要： | 根据岩石结构、构造及生物碎屑含量等特征,将本区栖霞组分为3类微相:A.生物碎屑灰岩;B.灰泥岩;C.具水平层纹的含炭质泥质细生物屑灰岩(泥灰岩).在剖面上,这3类微相组合成CA、CB或以C微相为主的韵律.不同韵律纵向上有规律的叠置常构成厚约10余米的沉积旋回.根据沉积旋回在垂向上的更替,在本区栖霞组内可识别出4次较大的海平面变化,周期约3My.通过与同期泛大陆北方各大陆上所发育的旋回层的对比,作者认为本区栖霞组内的4次海平面变化属三级海平面变化,对应4个三级层序,为全球冰川性海平面变化的结果,可与同期北美大陆上海平面变化曲线对比.
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| 关 键 词： | 栖霞组 沉积旋回 层序 湖北省 |
Depositional Environments, Cycles and Sequences of Chihsia Formation in Hubei Province |
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| Yan Jiaxin.Depositional Environments, Cycles and Sequences of Chihsia Formation in Hubei Province[J].Earth Science-Journal of China University of Geosciences,1994,3(5). |
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| Authors: | Yan Jiaxin |
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| Abstract: | Based on the texture, structure and content of organic grains in the Chihsia Formation of Hubei Province, microfacies in the formation can be grouped into 3: A. bioclastic limestone (wackestone and packstone); B. mudstone; C. bioclastic limestone or marl with laminae. Vertical alternation of the microfacies comprises rhythms as CA or CB, which in turn constitutes the depositional cycle from CB to C to CB with chert nodules capped by CA. The variation of the depositional cycle vertically enables them to be grouped into 4 major cycles with duration about 3 My. Like mesotherms developed in the Northern Hemispher, 4 major cycles are thought to be resulted from glacio-eustatic sea-level changes in the scale of Vail's third order sea-level change, and represent 4 depositional sequences. |
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| Keywords: | Chihsia Formation depositional cycle depositional sequence Hubei Province |
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