• 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 Riverhansi-font-family: ’times new roman’">s upper-middle stream,which lies in the Nanpanjiang River-Hongshuihe River basin,is flowing through the northwest section of Youjiang River-Nanpanjiang Riverhansi-font-family: ’times new roman’">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 Plateauhansi-font-family: ’times new roman’">s activities in the Cenozoie Era.After investigations of subbasin hansi-font-family: ’times new roman’">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 hansi-font-family: ’times new roman’">Ⅱ from Longlin to Tianhansi-font-family: ’times new roman’">＇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 Tianhansi-font-family: ’times new roman’">＇e.It appears the NE-arc-spread in Buliuhe River near Tianhansi-font-family: ’times new roman’">＇e.In this paper,we introduce the concepts of Synformal Tectonic System and the Rotation Block Tectonic Systemhansi-font-family: ’times new roman’">（RBTShansi-font-family: ’times new roman’">）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 blockhansi-font-family: ’times new roman’">（Ahansi-font-family: ’times new roman’">）deforms the tectonic in the surrounding to form the RBTS.The reversed-knick-point in Tianhansi-font-family: ’times new roman’">＇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.