摘要
通过对长春地区HDBZK-1孔沉积序列的热释光测年和沉积物粒度分析,选取对气候变化较为敏感的K2O、Na2O、MgO、CaO、Al2O3等氧化物及K2O/Na2O、Al2O3/(Al2O3+CaO+Na2O)作为环境代用指标,并与孢粉分析资料相结合,分析了长春地区中更新世晚期(约280～120kaB.P.)的气候环境变化。结果表明:该区中更新世晚期总体经历了4次明显的冷干—暖湿气候变化,即寒冷干旱(281.6～244.0kaB.P.)—温凉稍湿(244.0～215.0kaB.P.)—寒冷干旱(215.0～131.8kaB.P.)—以淡水藻类花粉突然增多为明显标志的暖湿(131.8～126.4kaB.P.);这与深海氧同位素曲线所反映的气候变化旋回有较好的对应关系。
On the basis of TL dating and grain size analysis of the Core HDBZK-1 samples in the Changchun Area,the authors employ K2O,Na2O,MgO,CaO,Al2O3 and their ratios,K2O/Na2O and Al2O3/（Al2O3＋CaO＋Na2O）,which are sensitive to environmental changes,combined with pollen analysis,to analyze the climate environment change of the Changchun area during the late Mid-Pleistocene（probably from 280 to 120 kaB.P.）.The results show that the Changchun area has experienced four distinctive cold-dry and warm-wet paleo-climate changes during the late Mid-Pleistocene：cold and dry（281.6-244.0 kaB.P.）-moderate warm and slightly wet（244.0-215.0 kaB.P.）-cold and dry（215.0-131.8 kaB.P.）-the climate turned warm and wet again,with an obvious sign of a sudden increase of freshwater algae（131.8-126.4 kaB.P.）,which probably comply with the climate cycles reflected by deep-sea oxygen isotope curves.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2010年第5期1066-1074,共9页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(40621063)
吉林省地震局项目(105147-2)
吉林大学'211'工程三期建设项目
关键词
地球化学
孢粉
古气候演化
中更新世晚期
长春地区
geochemistry
pollen
paleo-climate changes
Late Mid-Pleistocene
Changehun area
