辽西热河生物群演化的主要地质背景  

Main geological background during the evolution of Jehol Biota from western Liaoning

作　　者：张立军[1,2] 

机构地区：[1]吉林大学古生物学与地层学研究中心,长春130026 [2]辽宁省化石资源保护管理局,沈阳110032

出　　处：《世界地质》2013年第3期447-462,共16页World Geology

基　　金：辽宁省化石资源保护管理局全省古生物化石保护项目(00062013000002)

摘　　要：本文结合近年来辽宁省化石资源调查成果,对辽西热河生物群的分布和组成进行了总结,进一步明确了以辽西各主要盆地化石群为代表的相对连续的化石群序列;运用宏观进化理论和地理隔离等观点分析了辽西热河生物群脊椎动物的演化,并对其主要地质背景进行了总结。对辽西热河生物群脊椎动物的演化,可识别出辐射、趋同和复式进化等类型;在义县组阶段存在着由于地理隔离而发生的成种事件,九佛堂组阶段翼龙和鸟类的辐射可能与由于食性分化而导致的生态隔离有关;热河生物群的演替很可能是打破地理隔离后部分物种的绝灭、一些本地起源物种的向外迁移和外来物种的侵入、部分类群的辐射和复式进化共同作用的结果,与其所处的主要地质背景在时空上协同一致。综合分析认为,义县组火山岩已经"穿时",在其晚期火山活动初始,已进入九佛堂组阶段。Combining with the new data obtained from the fossils for recent years, the author summarizes the distribution and composition of the Jehol Biota from western Liaoning, makes clear on the evolutionary sequences of the biota in several main basins, and analyzes the evolution and geological background of the fossils vertebrates in several main basins in this region. From the vertebrate evolution, the author has recognized the radiation, conver- gence and complex evolution in type. During the Yixian Formation stage, the specific formation events were in ex- istence due to the geographic isolation, and at the Jiufotang Formation stage, the radiation of the pterosaurs and birds is possibly related to the ecological isolation, which was mainly due to the differentiation in feeding. The evo- lution of the Jehol Biota is probably as a results of a cooperative action including indigenous species outer immigra- ting, the alien species＇ invasion, the extinction of some species after geographic isolation, and some population in radiation, and complex evolution, which were all co-evolved in a similar geological background. The volcanic rocks of the uppermost Yixian Formation were passing the stratigraphic boundary with entering the beginning of the Jiufo- tang Formation stage.

关 键 词：热河生物群 演化 地质背景 辽西 

分 类 号：Q911.6[天文地球—古生物学与地层学]