论文部分内容阅读
摩尔多瓦位于东特提斯地区内,海相、陆相Sarmatian期沉积都很发育。根据软体动物和有孔虫化石,当地Sarmatian期沉积被分为三段。最近从摩尔多瓦各地37口井下和露头700块样品获得的孢粉结果支持Sarmatian期三分。这些孢粉化石资料说明区域性植被响应气候演变、海进、海退等所发生的变化。含有亚热带种类的山毛榉阔叶林统治了早Sarmatian期,有时暗针叶林增加。在海退期的晚Sarmatian期,含有喜盐植物(Chenopodiaceae,Amaranthus,Artemisia)的草本类增加。已有的资料显示了在东特提斯地区Sarmatian期植被的周期性变化。伴随着亚热带植物不断减少和禾草类个断增加,说明当时气候在朝年均温逐渐降低、干旱化增加、更加大陆性方向变化。
Moldova is located in the eastern Tethys area, marine, continental sedimentation Sarmatian are developed. According to molluscs and foraminifera fossils, the local Sarmatian sediments are divided into three sections. The recent sporopollen results obtained from 37 samples of downhole and outcrops in Moldova, up to 700 in Sarmatian. These sporopollen fossil data illustrate the changes in regional vegetation in response to climate change, seaborne and returnee. Beech broad-leaved forests with subtropical species governed the early Sarmatian period, sometimes with dark coniferous forests increasing. In the late Sarmatian period of sea-retreat, the herbaceous species containing the hi salt plants (Chenopodiaceae, Amaranthus, Artemisia) increased. The available information shows the cyclical changes in the Sarmatian period in the Eastern Tethys. With the continuous decrease of subtropical plants and the increase of grass species, it shows that the climate was gradually decreasing in the year-year average temperature and increasing in the direction of aridity and continental direction.