[关键词]
[摘要]
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,最后从摩尔多瓦各地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阔叶林统池了早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不断增加,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。
[Key word]
[Abstract]
The territory of Moldova lies within the Eastern Paratethys. The continental and marine Sarmatian sediments are wide spread. Based on mollusc and foraminifera fossils three-members of the Sarmatian is locally adopted. The recently obtained palynological spectra of 700 samples from 37 wells and outcrops in various parts of Moldova support the three-member division of the Sarmatian. These fossil data indicate the changes in regional vegetation in response to climate variations and marine transgressions and regressions. The broad-leaved Fagacean-type forests with subtropical species predominated the Early Sarmatian. Sometimes the quota of dark-coniferous species increased. During the regressive Late Sarmatian, abundance of herbs with halophylous species (Chenopodiaceae, Amaranthus, Artemisia) increased. The obtained data show a cyclic evolution of vegetation in Eastern Paratethys during the Sarmatian time with a steady decrease in diversity of subtropical flora and increase of grasses. This suggests a climate change toward a lower average annual temperature, a higher aridity, and more pronounced continental character.
[中图分类号]
Q914.7
[基金项目]