中文摘要：

通过对兰坪盆地野外露头及相关室内研究,分析了区内古近纪的沉积环境、层序特征、沉积相展布及其演化特征。认为古近纪主要发育冲积扇、河流、三角洲和湖泊环境。沉积建造为一个完整的盆地演化旋回：低位期,印度板块向欧亚板块的俯冲挤压造成兰坪走滑拉分盆地的形成,沉积了一套局限的湖盆相红色含膏盐细碎屑岩建造;湖扩期,挤压应力场转变为拉张应力场,湖盆扩大,大面积沉积了一套滨浅湖相紫红、砖红色砂泥岩互层沉积;湖缩期,受晚始新世喜马拉雅运动一幕的影响,应力场再次转变为强烈挤压,东西两侧造山带共同向盆地内推覆扩展,致使盆地范围明显缩小,仅在推覆体前缘形成一系列快速充填的小型山前陆相前陆盆地。层序古地理编图显示,蒸发岩发育于低位体系域,与低位期的沉积充填特点和气候有关,极具有找钾盐矿的前景。

英文摘要：

Based on field observation and indoor integrated analysis of some 20 outcrop profiles in Lanping basin in combination with such division criteria as regional sedimentary framework and sedimentary characteristics,the authors analyzed Palaeogene sedimentary environment,sequence stratigraphic features,sedimentary facies distribution and evolutionary features.Some tentative conclusions have been reached： In Palaeogene,alluvial fan,river,delta and lacustrine environments were dominantly developed in the Lanping basin.Sedimentary facies experienced regular concerted evolution in the course of evolution： In the lowstand period,the subduction and compressive action of Indian plate towards Eurasian plate caused the formation of Lanping strike-slip pull-apart basin and the deposition of a set of confined lake basin facies red gypsum fine detrital rock formation;in the lake expansion period,the conversion of compressional stress field into pull-apart stress field resulted in the expansion of the lake basin in early Eocene and the extensive deposition of a suite of littoral shallow lucustrine facies purplish red and brick red interbeds of sandstone and mudstone,reflecting the gradual rising of the lake surface and the gradual expansion of sedimentary area;in the lake contraction period,influenced by late Eocene Himalayan movement,the basin and its periphery experienced the conversion of pull-apart stress field into intense compression,and the orogenic belts on both east and west sides jointly expanded towards the interior of the basin through napping,leading to the beginning of the differential rapid uplift of the basin and the further contraction of the basin;as a result,only a series of small-sized piedmont continental foreland basins were formed at the front of the nappe whih were later filled with continental clastic molasses sediments.Stratigraphic sequence paleographic mapping has revealed that sedimentary ore resources（evaporates） had obvious stratabound characteristics and were developed in lowstand tracts in