Abstract: Along the middle segment of the Xiaojinag fault zone 21 basins of different scales have developed since Cenozoic. They have 4 different stages of evolution,i.e. the Eocene Oligocene,the Pliocene-early Pleistocene,the middle Pleistocene and the late Pleistocene Holocene stages. Among them,the Pliocene-early Pleistocene stage was the period of great prosperity of the basins. According to the duration time of the development of the basins,they can be classified into inherited basin,staged basin,rejuvenated basin and new born basin. The basins can be assigned to depressed and non-depressed origin. The Eocene Oligocene stage was dominated by non-depressed basins,the Pliocene-early Pleistocene stage was dominated by both depressed and non-depressed basins,while the stage after the middle Pleistocene was dominated by depressed basins. The depressed basins can further be divided into thrust type,graben-semigraben type and pull-apart type basins. Based on the analysis of the formation mechanism,plane distribtuion and the type of deposition of the basins,the authors have discussed the characteristics of the regional crustal movement in the different periods of Cenozoic along the southeastern margin of Qinghai Tibet Plateau and in Sichuan-Yunnan region.

Key words: Xiaojiang fault, Basin, Faulting

摘要： 小江断裂带中段新生代发育的系列盆地,根据其发育阶段可分为始新世-渐新世、上新世-早更新世、中更新世-晚更新世和晚更新世-全新世4个阶段,并根据发育持续性可分为继承性、阶段性、复活性、新生性4种类型。由大比例尺填图所获资料及前人成果,介绍了各阶段盆地的分布特征和成因机制,讨论了盆地发育与区域构造运动、断裂活动的关系。

关键词: 小江断裂, 盆地, 断层活动