| 柴北缘牦牛山地区牦牛山组沉积相组合特征 |
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| 引用本文： | 夏文静,牛漫兰,闫臻,吴齐,郭现轻,付长垒,李继亮.柴北缘牦牛山地区牦牛山组沉积相组合特征[J].地质学报,2014,88(5):943-955. |
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| 作者姓名： | 夏文静 牛漫兰 闫臻 吴齐 郭现轻 付长垒 李继亮 |
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| 作者单位： | 合肥工业大学资源与环境工程学院,合肥工业大学资源与环境工程学院,中国地质科学院地质研究所,合肥工业大学资源与环境工程学院,中国地质科学院矿产资源研究所,中国地质科学院地质研究所,中国科学院地质与地球物理研究所 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 柴达木盆地北缘牦牛山地区出露的牦牛山组是一套由冲积扇和扇三角洲相共同构成的陆相沉积组合，冲积扇相砾岩-粗砂岩组合主要分布于研究区SE侧，扇三角洲相砂岩-泥岩组合主要分布于研究区NW侧。古水流分析表明牦牛山组沉积物主要来自其SE侧古隆起，但后期扇三角洲相包含少量来自NW和NE向的沉积物。该套沉积组合序列特征与区域上分布在牦牛山西侧同时期形成的湖泊相、滨浅海相沉积共同表明，柴达木盆地北缘在晚志留-早泥盆世时期存在一NW向倾斜的古斜坡，且晚期北侧发生抬升。砾岩和砂岩碎屑组成与区域岩石组合类型对比表明，牦牛山组沉积碎屑物主要来自于滩间山群。沉积组合序列特征、碎屑组成和区域构造背景综合研究表明，牦牛山组可能为柴达木板块向北俯冲过程中形成的局部断陷盆地的充填物。
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| 关 键 词： | 冲积扇 扇三角洲 古地貌 牦牛山组 柴北缘 |
| 收稿时间： | 2013/10/18 0:00:00 |
| 修稿时间： | 2014/1/28 0:00:00 |
Sedimentary Facies of the Maoniushan Formation in Maoniushan Area along the North Margin of Qaidam |
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| Xia Wenjing,Niu Manlan,Yan Zhen,WU Qi,GUO Xianqing,FU Changlei and Li Jiliang.Sedimentary Facies of the Maoniushan Formation in Maoniushan Area along the North Margin of Qaidam[J].Acta Geologica Sinica,2014,88(5):943-955. |
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| Authors: | Xia Wenjing Niu Manlan Yan Zhen WU Qi GUO Xianqing FU Changlei and Li Jiliang |
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| Institution: | Department of Resources and Environment, Hefei University of Technology,Department of Resources and Environment, Hefei University of Technology,Institute of Geology, Chinese Academy of Geological Sciences,Department of Resources and Environment, Hefei University of Technology,Institute of Mineral Resources, Chinese Academy of Geological Sciences,Institute of Geology, Chinese Academy of Geological Sciences,Institute of Geology and Geophysics, Chinese Academy of Sciences |
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| Abstract: | The clastic rocks of the Maoniushan Formation in Maoniushan area along the northern margin of the Qaidam terrane is a suit of nonmarine sedimentary rocks that deposited in the alluvial fan and fan-delta environments. The alluvial fan deposits, conglomerate to coarse-grained sandstone association, are primarily located in the SE. The fan delta deposits are mainly distributed in the NW and consist of sandstone and mudstone. Paleocurrent analysis indicates that the Maoniushan Formation deposits originated from an ancient uplift which located in the SE primarily, but some deposits of fan delta were drived from NW and NE. In combination with synchronic lacustrine and shallow-marine sediments in the southwest of the study area, the spatial changes of these sedimentary facies suggest that a NW-striking paleoslope should exist along the north margin of the Qaidam terrane in the late Silurian-early Devonian and the north side uplifted in the later period. Comparison between detrital components and regional rock assenblages demonstrates that the clastic sediments of the Maoniushan Formation mainly derived from the Tanjianshan Group. Sedimentary sequence and regional tectonic evolution coevally suggest that the Maoniushan Formation deposited within a graben basin in a convergent setting which was formed by the northward subduction of the Qaidam terrane. |
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| Keywords: | alluvial fan fan-delta paleo-uplift Maoniushan Formation northern margin of the Qaidam terrane |
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