• 责任者：Zhang Peiquan (Seismological Bureau of Guangxi Zhuang Autonomous Region ; Nanning 530022 ; China) ; Sun Jie
• 刊名：Quaternary Sciences
• 出版年：2013
• 卷期：33(4)
• 关键词：流水地貌 ; fluvial features ; 珠江 ; Zhujiang River
• 页码：p.771-784
• 图表：13 illus., 2 tables, 38 refs.
• 分类号：1400
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

     In the geological evolution of Asia’s Cenozoie Era,the tectonic evolution of Tibetan Plateau not only generates lots of direct and long-ranged effects but also controls the evolution of many Asian rivers.As an important river in Asia,the Pearl Rivers upper-middle stream,which lies in the Nanpanjiang River-Hongshuihe River basin,is flowing through the northwest section of Youjiang River-Nanpanjiang Rivers Passive Margin Belt.The researches of its fluvial landforms are not only a means to comprehend the neo-tectonic movements of the old orogenic belts but also to investigate the long-ranged effects of Tibetan Plateaus activities in the Cenozoie Era.After investigations of subbasin Ⅱ,it appears seriously basin asymmetry between the left and the right banks.The near-EW arc drainage divide appears in the south of subbasin Ⅱ from Longlin to Tian＇e.Both the knick-point section and the reversed-S-type river network in RN3 emerge in Nanpanjiang River channel along Longlin area from Basuo to Nagong.Landform transition can also be seen in the northern boundary of the reversed-S-shape river network.Both the growth of the NE fault,near-EW arc fault and arc tributary emerge in Longlin area from Basuo to Nagong.There are reversed-knick-point in the channel of Hongshuihe River near Tian＇e.It appears the NE-arc-spread in Buliuhe River near Tian＇e.In this paper,we introduce the concepts of Synformal Tectonic System and the Rotation Block Tectonic System（RBTS）to explain the landforms and the tectonic movements.The researches show that the asymmetric subbasin,the EW arc drainage divide,the NE fault,the near-EW arc fault and arc tributary spread are all controlled by the pre-existed Synformal Tectonic System.The fluvial landforms of knick-point,landform transition,reversed-S-type river network along Longlin area are the responses to the succeeding tectonic system activities.The succeeding tectonic activities are inherited from the Synformal Tectonic System.As the rotation centre,the Xiangbo block（A）deforms the tectonic in the surrounding to form the RBTS.The reversed-knick-point in Tian＇e is not only resulted by the different hydraulic conditions of the upstream and downstream but also by the tectonic uplift.But there are still no geochronology constraints for the start-up time and segment activities of the RBTS.The extrusion of Asian continent provides a possible mechanical explanation for the activities of the RBTS.