辽西地区中生代环境变迁及生物演替

对辽西中生代盆地沉积相及地球化学特征的分析表明，辽西地区在中生代经历了复杂的环境变迁，从早期（晚三叠世－中侏罗世）的温暖潮湿气候环境过渡到中期（晚株罗世）干旱少雨的气候环境，最后再次过渡到晚期（早白垩世）温暖潮湿气候环境，其间发育有三次较大的火山作用；气候环境的巨变引起生物演化的更替，强烈的义县组火山作用一方面造成脊椎动物的集群灭亡，另一方面导致热河生物群的繁盛；早期鸟类的出现也是这一特定环境下的产物。

MESOZOIC ENVIRONMENT CHANGE AND BIOCOENOSE EVOLUTION IN WESTERN LIAONING PROVINCE

The analysis of Mesozoic sedimentary facies and geochemical characteristics of basin sediments in Liaoning Province reveals that the climate environment of western Liaoning Province changed obviously in Mesozoic. The palaeoclimate during late Triassic to middle Jurassic was warm humid, and in late Jurassic,it became arid, but in early Cretaceous, the environment became warm humid again.The great change of environment led to the evolution of different biocoenose.The Mesozoic intense volcanic activities gave rise to the vertabrate mass, and at the same time,it also led to the prosperity of Jehol biota.The early birds developed in such environment.