吉林省延边地区二叠纪的三类植物群与古陆缘再造

吉林省延边地区早二叠世晚期－晚二叠世早期存在着开山屯、解放村、青沟子等二处不同类型的植物群、前者属华夏植物群，中间为华夏与安加拉混生植物群，后者则是安 拉植物群，反映出和龙地块北部陆缘活动带、兴凯地块西部陆缘活动带、佳木斯地块东南部陆缘活带达三者鼎足而立的古地理展布格局。阐明这三类不同植物群的古植物地理区的属性，不仅藉以证明上三地块间各自陆缘活动带的存在及其相互关系，且将为解决延边地区争论至今的二

Three types of the Permian floras and old continental margin reconstruction in the Yanbian area, Jilin province

From the later stage of early Permian to the early stage of late Permain, three types floras are distributed in the Kaishantun, Jiefangcun and Qinggouzi areas, Yanbian region, Jilin province The Kaishantun belongs to Cathaysian flora; Jiefangcun belongs to mixed Cathaysian-Angara; Qinggouzi belongs to Angara flora That shows three paleogeographic distribution patterns, i e the northern margin active belt of the Helong land mass, western margin active belt of the Xingkai land mass and southern margin active belt of the Jiamusi land mass. In this paper, the attribute property of paleobotanic province of the three floras is expounded, not only indicating the existence of epicontinental active belts of the three land masses and their mutual relation, but also proposing a new train of thought for the Permain stratigraphic division in Yanbian area, as well as drawing inspiration to the evolution of the Permain lithospheric crust and in the process of orogenic movement.