对腾冲火山区上新世以来的火山 ,尤其是具有最新活动的黑空山、打鹰山和马鞍山进行了比较系统的 K- Ar年龄分析。去除样品中含有过剩氩的斜长石斑晶和橄榄石斑晶以后获得了一系列准确的基质 K- Ar年龄。根据火山活动的时空变化把腾冲火山活动分为三个期。第一期为上新世晚期 ,火山活动集中于火山区的西北和东南两端 ;第二期为早更新世期间 ,火山活动向腾冲盆地中心迁移和扩展 ,活动规模和分布面积最大 ;第三期为早更新世末期至全新世 ,早更新世末期至中更新世火山活动规模逐渐减小 ,集中于盆地中部南北向条带上 ,晚更新世以来收缩于黑空山、打鹰山和马鞍山三个地区 ,马鞍山到全新世仍有岩浆活动。第三期活动的起始和终止过程在空间上呈现由中北部向南部逐渐变新的规律 ,显示出火山活动从北向南迁移的趋势 A systematic K-Ar age analysis of the volcanoes in the Tengchong volcanic area since the Pliocene, especially with the latest activities of Black Hills, Yingying and Ma’anshan. A series of accurate matrix K-Ar ages were obtained after removal of plagioclase and olivine plaques with excess argon in the sample. The Tengchong volcano activity is divided into three phases according to the temporal and spatial changes of volcanic activity. The first phase is the Late Pliocene, volcanic activity concentrated in the volcanic area northwest and southeast ends; the second period during the Early Pleistocene, volcanic activity to the center of the Tengchong basin migration and expansion, activities and distribution of the largest area size; the third During the period from Early Pleistocene to Holocene, volcanic activity gradually decreased from the end of Early Pleistocene to the middle Pleistocene, concentrating on the north-south strip in the central part of the basin, contracting in Heikongshan, Daying Mountain and Ma’anshan III since Late Pleistocene Areas, Ma On Shan to the Holocene still magmatic activity. The process of initiation and termination of the third activity spatially shows a gradual change from the central north to the southern part, indicating the trend of volcanic activity migrating from north to south