新昌硅化木揭示的早白垩世东南沿海地区古气候特征分析

根据浙江省新昌硅化木的分布与特点，应用硅化木记录的可知性和植物学的类比原理，通过该地区硅化木、其他植物化石和岩性组合等综合分析，初步探讨了早白垩世新昌盆地南洋杉型木的生态环境，以此研究该时期东南沿海地区的古气候主要特征。研究表明：该地区早白垩世古气候的主要特点是温暖、湿润及有时存在相对干旱的季节，同时呈现由温湿逐渐转变为干旱炎热的气候变化趋势；新昌硅化木中有明显的树木年轮，表明这种古气候可能存在一定的季节变化。

Analysis on Ancient Climate Characteristics in SE China in Earlier Cretaceous Period Based on the Xinchang Petrified Wood

According to the distributions and characteristics of the Xinchang petrified woods found in Xinchang,Zhejiang Province, and the some basic principles about petrified wood and botany, this paper preliminarily analyzes the ecological environment of the Araucarioxylon Xinchangense Duan sp. nov. , living in Xinchang basin in the earlier Cretaceous period. By means of the comprehensive study of the petrified wood, other plant fossils and rock groups, some principal characteristics of the ancient climate in SE China are investigated. It is found that in this region the important characteristics of the climate in the earlier Cretaceous period were warm, moist, and sometime drier relatively. At the same time, other important trend was the climate change from warm and moist climate to dry and hot one. Visible tree rings of the Xinchang Petrified Wood indicate that there might be some seasonal changes in the ancient climate.