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古地理学报 ›› 2013, Vol. 15 ›› Issue (2): 155-168. doi: 10.7605/gdlxb.2013.02.015

• 岩相古地理学及沉积学 • 上一篇    下一篇

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*

陈军1,2, 柳永清2, 旷红伟2, 刘燕学2, 彭楠1,2, 许欢2, 董超2,3, 刘海2,3, 薛沛霖2,3, 徐加林2,3   

  1. 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
  • 收稿日期:2012-06-25 修回日期:2012-12-03 出版日期:2013-04-01 发布日期:2013-04-01
  • 通讯作者: 柳永清，男，1960年生，中国地质科学院地质所研究员，从事沉积地质学、沉积古地理和古生态学研究。E-mail:liuyongqing@cags.ac.cn。
  • 作者简介:陈军，男，1987年生，中国地质大学（北京）硕士研究生，从事沉积地质学研究。E-mail:chenjun1987111@163.com。
  • 基金资助:

    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）和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

Sedimentary characteristics and their basin analysis significance of the Lower Cretaceous Hekou Group in Zhongpu area of Lanzhou-Minhe Basin，Gansu Province

Chen Jun1,2, Liu Yongqing2, Kuang Hongwei2, Liu Yanxue2, Peng Nan1,2, Xu Huan2, Dong Chao1,2, Liu Hai1,2, Xue Peilin1,2, Xu Jialin2,3   

  1. 1 School of Earth Sciences and Natural Resources，China University of Geosciences(Beijing)，Beijing100083; 
    2 Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037; 
    3 School of Geophysics and Petroleum Resources，Yangtze University，Jingzhou434023，Hubei
  • Received:2012-06-25 Revised:2012-12-03 Online:2013-04-01 Published:2013-04-01
  • Contact: Liu Yongqing，born in 1960，is a research professor of Institute of Geology，Chinese Academy of Geological Sciences，and is engaged in sedimentary geology， sedimentary palaeogeography and palaeobiology.E-mail:liuyongqing@cags.ac.cn.
  • About author:Chen Jun，born in 1987，is a master degree candidate of China University of Geosciences(Beijing)，and is engaged in sedimentary geology.E-mail:chenjun1987111@163.com.

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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。

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

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.

Key words: Lanzhou-Minhe Basin, Lower Cretaceous, Hekou Group, sedimentary facies, basin analysis, sedimentary environment

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