摘要
格罗夫山沉积岩漂砾是东南极兰伯特冰川活动所遗留下来的新生代沉积物,因而是研究东南极冰盖历史演化的直接证据。格罗夫山沉积岩漂砾所含孢粉非常稀少,其孢粉组合特征以低丰富度草本植物花粉为主,伴有少量其它被子植物和藻类孢子。虽然孢粉的种类和数量不足以重建原始的植物群落,但至少可以为晚新生代南极大陆古植被提供信息。暗示草本-苔原植被或许发育,气候类似于现今温凉-寒冷的亚南极地区。格罗夫山沉积岩漂砾中稀有的陆相孢粉可能是由于沉积时期周围陆地稀有的边缘植被产生的,也可能由于快速沉积稀释的结果。
Cenozoic glacial erratics in the Grove Mountains provide direct evidence of evolution of the Lambert Glacier and the East Antarctic Ice Sheet. In general, contemporaneous spores and pollen from the glacial erratics of the Grove Mountains are extremely sparse. Spore-pollen assemblages are dominated by several species of herbaceous pollen, with a few other accessory angiosperm pollen and algal cysts. Although the abundances and species of the miospores found in these erratics are not enough to reconstruct their original plant communities, they probably provide some informa tion about the terrestrial palaeovegetation,at least for the late Cenozoic of the Antarctic continent reflecting a low di- versity herb-tundra vegetation and a climate condition similar to the present-day cool to cold Subantarctic regions. The low number of contemporaneous terrestrial palynomorphs recovered from the glacial erratics of the Grove Mountains is interpreted to be principally from the scarcity of terrestrial vegetation in the adjacent land areas during the late Ce- nozoic, or extreme dilution under rapid sediment accumulation.
出处
《微体古生物学报》
CSCD
北大核心
2013年第2期113-122,共10页
Acta Micropalaeontologica Sinica
基金
国家自然科学基金项目(No.41206183和No.41272216)
南北极环境综合考察与评估专项(No.CHINARE 2013-02-02)
国家海洋局极地考察办公室项目(No.IC201106)的支持下完成
关键词
孢粉
古植被
新生代
格罗夫山
东南极
spores and pollen, palaeovegetation, Cenozoic, Grove Mountains, East Antarctica
