吉林龙岗火山是我国近代仍有喷发活动的火山区之一,在历史时期曾发生过多次喷发活动,确定每次喷发的具体时代对评价和预测火山灾害具有重要意义,在大椅子山和吊水湖两地采集的碱性玄武岩样品,被磁选分离后,通过铀系组分法测定,获得的年龄分别为距今(71±9)ka,(106±13)ka,说明龙岗地区在晚更新世有过强烈的火山喷发活动。 Jilin Longgang volcano is one of volcanic areas still erupted in modern China. During the historical period, many eruptions have occurred. It is of great significance to determine the specific times of each eruption to evaluate and predict volcanic disasters. The alkaline basalt samples collected in both waterfloods were separated by magnetic separation and determined by the uranium-based component method. The obtained ages were (71 ± 9) ka and (106 ± 13) ka, respectively. Late Pleistocene had a strong volcanic eruption.