摘要
距今5000年左右世界各地普遍存在一次幅度较大的短期降温气候事件。通过对金川剖面泥炭地层14C测年、孢粉分析,认为东北地区此次降温事件结束的14C年龄在4700aB.P.左右,降温事件出现之前气候温暖湿润,降温事件过后温度持续下降。金川剖面的记录与东北地区其它类型沉积物所记录的降温事件出现的时间基本吻合。降温事件对燕辽地区古文化演变产生了深刻的影响。
There generally exists a climatic event that a large range of short-term temperature dropped all over the world at 5 000 aB.P. .According to Carbon-14 dating method and pollen analysis of peat bed in Jinchuan section,it is believed that Carbon-14 age was at about 4 700 aB.P. when the event of temperature drop ended in North-east of China, and climate was warm and humid before the event of temperature drop happened, and the temperature dropped continuously after the event of temperature drop. The time when the event of temperature drop happened according to the records of Jinchuan section is basically identical to that according to the records of other kinds of sediments in North-east of China. The event of temperature drop has an impressive effect on palaeoculture evolution in Yanliao region
出处
《云南地理环境研究》
2003年第1期12-18,共7页
Yunnan Geographic Environment Research
