| 金沙江石鼓-宜宾段河谷-水系演化研究综述与讨论 |
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| 引用本文： | 李华勇,明庆忠.金沙江石鼓-宜宾段河谷-水系演化研究综述与讨论[J].地理与地理信息科学,2011,27(2):50-55. |
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| 作者姓名： | 李华勇 明庆忠 |
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| 作者单位： | 云南师范大学旅游与地理科学学院,云南,昆明,650092;高原地理过程与环境云南省重点实验室,云南,昆明,650092 |
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| 基金项目： | 国家自然科学基金，云南省中青年学术带头人培养基金，云南省科技发展计划2009年重点项目，教育部科学技术研究重点项目 |
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| 摘 要： | 有关金沙江形成演化研究的历史已有百年之久,近十年来更是地学界研究热点之一,产出成果颇为丰硕。该文在对一个多世纪以来有关金沙江研究成果分析基础上,勾绘出金沙江石鼓-宜宾段上新世以来的河谷形成演化过程,基本观点为:全新世之前该区存在数条并列南流水系;上新世末-早更新世初,湖泊广泛发育;早更新世中后期,金沙江经丽江-鹤庆,于金江街附近汇入昔格达古湖;早更新世末期,昔格达古湖被切穿泄空,金沙江下游袭夺连通;中更新晚期,石鼓以南的东西向隆起使金沙江南流受阻,被动袭夺至水洛河,并于三江口与下游川江连通,至此形成真正具有现代意义的金沙江。
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| 关 键 词： | 金沙江 河谷-水系演化 形成年代 河流袭夺 第四纪 |
Summary and Prospects for the Valley & Drainage Evolution of the Shigu-Yibin Section of the Jinsha River |
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| LI Hua-yong,MING Qing-zhong.Summary and Prospects for the Valley & Drainage Evolution of the Shigu-Yibin Section of the Jinsha River[J].Geography and Geo-Information Science,2011,27(2):50-55. |
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| Authors: | LI Hua-yong MING Qing-zhong |
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| Institution: | (School of Tourism & Geography Science,Yunnan Normal University,Kunming 650092;Yunnan Provincial Key Laboratory of Plateau Geographic Process and Environment Changes,Kunming 650092,China) |
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| Abstract: | In this paper,the progress of the valley formation and evolution of the section from Shigu to Yibin of Jinsha River since late Pliocene was described based on the analysis to the researches on the Jinsha River over the past century.The basic point is that,there were several parallel rivers flowed southward in the area before the late Pliocene;numerous lakes emerged and well developed between late Pliocene and early Pleistocene;the paleo-Jinsha River flowed through Shigu and Lijiang-Heqing Basin,pouring into ancient Xigeda Lake at Jinjiangjie in the middle early-Pleistocene;the downstream Jinsha River connected by a serious of river capture and the ancient Xigeda Lake disappeared in the late early Pleistocene,then the paleo-Jinsha River started to flow eastward.At the end of middle-Pleistocene,because of the strong upheaval along Jianchuan-Heqing-Yongsheng-Huaping-Dukou-Luoxue,Lijiang-Heqing Basin was cut into three basins(Lashi,Lijiang and Heqing Basin),then the old Jinsha River flowed northward along with the watercourse of Shuiluo River and converged with Chuan River at Sanjiangkou,till that time formed the modern Jinsha River. |
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| Keywords: | Jinsha River water valley & drainage system evolution formation history river capture Quaternary |
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