| 甘肃兰州-民和盆地中铺地区下白垩统河口群沉积特征及其盆地分析意义* |
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| 引用本文： | 陈军,柳永清,旷红伟,刘燕学,彭楠,许欢,董超,刘海,薛沛霖.甘肃兰州-民和盆地中铺地区下白垩统河口群沉积特征及其盆地分析意义*[J].古地理学报,2013,15(2):155-168. |
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| 作者姓名： | 陈军 柳永清 旷红伟 刘燕学 彭楠 许欢 董超 刘海 薛沛霖 |
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| 作者单位： | 1.中国地质大学（北京）地球科学与资源学院，北京100083;2.中国地质科学院地质研究所，北京100037;3.长江大学地球物理与石油资源学院，湖北荆州434023 |
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| 基金项目： | 国家自然科学基金项目(编号:90914003);中国地质调查局项目(编号:1212011085477);中国地质科学院地质研究所基本业务费项目(编号:J1106)共同资助 |
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| 摘 要： | 甘肃兰州-民和盆地是中国西部典型的陆内断陷沉积盆地，该盆地发育的下白垩统河口群是一套以红褐色为主的碎屑岩地层。依据野外调查，以盆地分析方法为手段，从地层、沉积相、物源和古水流等方面入手对盆地东南部的中铺地区河口群进行了沉积环境的系统分析。通过对研究区内河口群沉积相、沉积构造和沉积序列的研究，认为整套地层垂向上发育有冲积扇相-辫状河相-曲流河相沉积，并进一步划分出若干微相；同时结合该地区的物源和古水流分析认为，早白垩世研究区内的物源主要来自南部的祁连山多旋回造山带；盆地内的下白垩统河口群在不同地区呈现出不同特点，并以此建立了兰州-民和盆地早白垩世古地理格局及盆地演化模式。
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| 关 键 词： | 兰州-民和盆地 早白垩世 河口群 沉积相 盆地分析 沉积环境 |
| 收稿时间： | 2012-06-25 |
Sedimentary characteristics and their basin analysis significance of the Lower Cretaceous Hekou Group in Zhongpu area of Lanzhou-Minhe Basin,Gansu Province |
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| Chen Jun,Liu Yongqing,Kuang Hongwei,Liu Yanxue,Peng Nan,Xu Huan,Dong Chao,Liu Hai,Xue Peilin,Xu Jialin.Sedimentary characteristics and their basin analysis significance of the Lower Cretaceous Hekou Group in Zhongpu area of Lanzhou-Minhe Basin,Gansu Province[J].Journal of Palaeogeography,2013,15(2):155-168. |
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| Authors: | Chen Jun Liu Yongqing Kuang Hongwei Liu Yanxue Peng Nan Xu Huan Dong Chao Liu Hai Xue Peilin Xu Jialin |
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| Institution: | 1.School of Earth Sciences and Natural Resources，China University of Geosciences(Beijing)，Beijing100083; 2.Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037; 3.School of Geophysics and Petroleum Resources，Yangtze University，Jingzhou434023，Hubei |
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| Abstract: | Lanzhou-Minhe Basin is a typically intracontinental rift basin in western China.The Lower Cretaceous Hekou Group is a set of red brown based clastic rock formations.On the basis of field investigations，by means of basin analysis method，this article has a systematic analysis of the Hekou Group in the Zhongpu area of southeastern basin on the stratigraphy，sedimentary facies，provenance and palaeocurrent.The analysis result of sedimentary facies，sedimentary structures and sedimentary sequence of the Hekou Group indicates the vertical development of alluvial fan-braided river-meandering river facies and several microfacies.Meanwhile，the region of provenance and palaeocurrent research indicates that the provenance in this region mainly was the south Qilian Mountains polycyclic orogenic belt during the Early Cretaceous. It is concluded that the Hekou Group in different regions shows different characteristics in the Early Cretaceous，based on which， the Lanzhou-Minhe Basin palaeogeographic pattern and basin evolution model are established. |
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| Keywords: | Lanzhou-Minhe Basin Lower Cretaceous Hekou Group sedimentary facies basin analysis sedimentary environment |
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