全文快速搜索:          
引用本文:江华军1 李长安1,2 张玉芬3 王节涛1. 嘉陵江古河曲发育的古地理环境重建[J]. 中国地质, 2013, 40(2): 460-468.
JIANG Hua-jun1, LI Chang-an1,2, ZHANG Yu-fen3, WANG Jie-tao1. The reconstruction of paleogeographic environment for the development of the Jialing River’s ancient meander[J]. Geology in China, 2013, 40(2): 460-468(in Chinese with English abstract).
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  下载PDF阅读器  关闭
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 1495次   下载 4945 本文二维码信息
码上扫一扫!
分享到: 微信 更多
嘉陵江古河曲发育的古地理环境重建
江华军1 李长安1,2 张玉芬3 王节涛11,2,3
1.中国地质大学地球科学学院,湖北 武汉 430074;2.中国地质大学生物地质与环境地质国家重点实验室,湖北 武汉 430074;3.中国地质大学地球物理与空间信息学院,湖北 武汉 430074
摘要:
提要:嘉陵江古河道的遥感影像轮廓反映了自由河曲的河流形态信息,分析嘉陵江古河曲的发育条件对其区域古地理环境的重建和恢复具有重要的地貌学研究意义。本文在综合前人关于自由河曲的理论与实际案例研究成果的基础上,总结了自由河曲的发育条件。据此,结合野外调查资料,认为嘉陵江古河曲形成时,该区应为平坦开阔的冲积平原,河流纵比降较比现在更小;河流两岸为具有“二元结构”的松散沉积物。与长江下荆江河段的地理环境类似。且“三水汇流”(嘉陵江与渠江、涪江)格局已经存在。嘉陵江由自由河曲转为深切河曲是由于区域地质环境(或地质事件)的改变所引起的。
关键词:  嘉陵江  古河曲  自由河曲  发育条件  古地理重建
DOI:
分类号:
基金项目:国家自然科学基金项目(40971008和40771213)和中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金 项目(Grant SKLLQG0908)资助。
The reconstruction of paleogeographic environment for the development of the Jialing River’s ancient meander
JIANG Hua-jun1, LI Chang-an1,2, ZHANG Yu-fen3, WANG Jie-tao11,2,3
1. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China;2. State Key Laboratory of Biogeology and Environment Geology, Wuhan 430074, Hubei, China;3. Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Hubei, China
Abstract:
Abstract:Remote sensing images of the Jialing River’s old channel reflect the river pattern information of the free meanders. The analysis of the development condition of the old meanders of the Jialing River has important geomorphological significance in the reconstruction and restoration of the regional paleogeographic environment. On the basis of previous researches and practical cases on the free meanders, this paper summarized development conditions of the free meander. On such a basis, in combination with field investigation data, the authors hold that, when the ancient meander stared its formation, the area was a flat and wide plain landform, and the channel gradient ratio was smaller than the present value. Materials of banks on both sides of the river were composed of unconsolidated sediments characterized by “dualistic structure ”. This geographical environment was similar to the that of the lower part of the Jingjiang River that belonged to the Yangtze River. Moreover, the pattern of “ three confluence rivers ” composed of the main stream of the Jialing River and its tributary ( Qujiang River and Fujiang River ) had already existed at that time. The transformation of the free meander to the incised meander of the Jialing River was caused by change of the regional geological environment or the geological events.
Key words:  Jialing River, ancient meanders  free meanders  development conditions  reconstruction of paleogeographic environment