| 鄂尔多斯盆地南缘奥陶系平凉组等深流沉积* |
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| 引用本文： | 李华,何幼斌,黄伟,刘朱睿鸷,张锦.鄂尔多斯盆地南缘奥陶系平凉组等深流沉积*[J].古地理学报,2016,18(4):631-642. |
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| 作者姓名： | 李华 何幼斌 黄伟 刘朱睿鸷 张锦 |
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| 作者单位： | 1.长江大学油气资源与勘探技术教育部重点实验室,湖北武汉 430100;2.长江大学沉积盆地研究中心,湖北武汉 430100;3.长江大学地球科学学院,湖北武汉 430100 |
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| 基金项目： | 国家自然科学基金项目(批准号:41472096;41502101);湖北省创新群体基金项目(编号:2015CFA024);长江青年基金项目(批准号:2015cqn26)联合资助~~ |
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| 摘 要： | 鄂尔多斯盆地南缘奥陶系平凉组发育石灰岩、泥岩和砂岩,夹放射虫硅岩及凝灰岩,深水原地沉积、重力流沉积及等深流沉积发育。等深流沉积主要为砾屑、砂屑、粉屑、灰泥及粉砂—砂质等深积岩。粉屑等深积岩顶部发育波痕及生物扰动,波痕不对称,迁移方向明显,波长1~5,cm,波高0.2~0.5,cm。等深流沉积具有灰泥等深积岩、粉屑等深积岩、砂屑等深积岩及砾屑等深积岩叠置组成的完整及不完整的细—粗—细沉积层序,厚度几毫米至数厘米。该层序既可由多层叠置而成,也可由单层组成或在相邻泥质纹层或缝合线之间直接出现,并存在向上变粗的逆递变和向上变细的正递变厚度不对称特征。等深流从东向西,大致平行于斜坡运动。平凉组下部发育深水原地沉积和重力流沉积,上部则发育深水原地沉积和等深流沉积。等深流沉积主要受构造运动、相对海平面升降、古地貌、流体能量及运动路径的影响。
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| 关 键 词： | 等深流 等深流沉积 等深积岩 鄂尔多斯盆地 平凉组 |
| 收稿时间： | 25 January 2016 |
Contourites of the Ordovician Pingliang Formation in southern margin of Ordos Basin |
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| Li Hua;He Youbin;Huang Wei;Liu Zhuruizhi;Zhang Jin.Contourites of the Ordovician Pingliang Formation in southern margin of Ordos Basin[J].Journal of Palaeogeography,2016,18(4):631-642. |
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| Authors: | Li Hua;He Youbin;Huang Wei;Liu Zhuruizhi;Zhang Jin |
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| Institution: | 1.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education, Yangtze University,Wuhan 430100,Hubei 2 Research Center of Sedimentary Basin,Yangtze University,Wuhan 430100,Hubei;3.School of Geosciences,Yangtze University,Wuhan 430100,Hubei |
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| Abstract: | The contourites,gravity flow deposits and deep water autochthonous deposits, consisting of limestone,mudstone with sandstone with radiolarian chert and volcanic tuff interbeds, were developed in the Ordovician Pingliang Formation in the southern margin of Ordos Basin. Contourites were divided into calciruditic contourites,calcarenitic contourites,calcisiltitic contourites,calcilutitic contourites and silt-sandy contourites. Ripples and bioturbation were well shaped on top of calcisiltitic contourites. The ripples,with wave length 1-5,cm and wave height 0.2-0.5,cm,were asymmetric and showed migration direction obviously. The complete and incomplete sedimentary sequences were composed of superimposed calcarenitic contouritse,calcisiltitic contourites and calcilutitic contourites,and displayed upward fine-coarse-fine trend with thickness several millimeters to centimeters. The sequences consisted of not only superimposed multilayer,but also single layer,or appeared between two adjacent muddy layers or stylolites;and the thickness of the upward￣coarsening sequences and the upward￣fining ones were asymmetrical. Contour current moved from the east to the west with path subparallel to the slope. The deep water autochthonous deposits and gravity flow deposits were developed in the lower part of the Lower Pingliang Formation; by contrast,the deep water autochthonous deposits and contourites were favored in the upper part. The contourites were mainly influenced by tectonic movements,relative sea-level rise,current energy,palaeotopography and motion path. |
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| Keywords: | contour current contour current deposit contourite Ordos Basin Pingliang Formation |
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