• 责任者：Zheng Hongbo (School of Geography Science ; Nanjing Normal University ; Nanjing 210023 ; China) ; Wang Ping
• 刊名：Quaternary Sciences
• 出版年：2013
• 卷期：33(4)
• 关键词：水系 ; drainage system ; 长江 ; Yangtze River
• 页码：p.621-630
• 图表：6 illus., 51 refs.
• 分类号：1400
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

     The development of fluvial systems in East Asia is closely linked to the evolving topography following India-Eurasia collision.Despite this,the age of the Yangtze River system has been strongly debated,ranging from pre-Tertiary,Early Tertiary,Late Tertiary to Pleistocene.Here,we present new 40 Ar/39 Ar ages from basalts interbedded with fluvial sediments from the lower reaches of the Yangtze together with detrital zircon U/Pb ages from sand grains within these sediments.We show that a river containing sediments indistinguishable from the modern river was established before ca.23Ma.We argue that the connection through the Three Gorges must post-date 36.5Ma because of evaporite and lacustrine sedimentation in the Jianghan basin before that time.We propose that the present Yangtze River system formed in response to regional extension throughout Eastern China,synchronous with the start of strike-slip tectonism and surface uplift in eastern Tibet and fed by strengthened rains caused by the newly intensified summer monsoon.