苏北盆地里下河地区30～15cal ka BP期间地球化学元素变化特征及古气候意义  

Characteristics of Geochemical Element Variation and Paleoclimatical Significance in the Subei Basin during 30--15 cal ka BP

作　　者：张唯唯[1] 舒强[1] 陈晔[1] 赵志军[1] 张茂恒[1] 

机构地区：[1]南京师范大学地理科学学院,江苏省环境演变与生态建设实验室,南京210023

出　　处：《地球与环境》2014年第5期583-588,共6页Earth and Environment

基　　金：国家自然科学基金项目(40501075;40671193)资助

摘　　要：应用因子分析法对苏北盆地里下河地区SG剖面中的地化元素和氧化物进行分析,提取出相关古气候信息,重建了苏北盆地里下河地区30～15cal ka BP期间的古气候环境演化序列：30.3～26.0cal ka BP为相对暖湿期;26.0～17.8cal ka BP较为显著的冷干期;17.8～15.0cal ka BP以升温为主,冷暖波动剧烈,整体相对暖湿期;另外,在这些大的气候演变背景条件下,也存在着多次明显的气候波动事件。这一研究结果不仅与国内大量的研究资料相一致,而且与深海氧同位素和北半球太阳辐射等曲线也有着很好的对应,表明苏北地区的气候变化具有全球性特征。Due to the powerful data processing function, the factor analyzing method has been widely used in many fields. In the article, based on the factor analyzing method we analyzed the geochemical elements‘ data of the SG core in the Subei Basin, ex- pect to get the main factor. So we can use the least amount of the unobservable public factor to replace the original observable geochemical elements and oxide contents. SG drilling was located in a dried pond （33°8′N,119°43′E）, which is 1 km away from south Shagou Town in Xinhua, Subei Basin . The length of the core is 518 cm, and the lithology is dominated with clay and silty clay of different colors. We collected 258 samples for geochemical elements analysis, with an interval of 2 cm, and 3 14C samples for radiocarbon 14 C dating. We separately obtained the correlation coefficients matrix among variables （R type）, factor loading matrix element combination among variables（R type）, factor loading matrix among samples （Q type） and the contribution rate of each factor from the processing and analysis of 18 kinds of elements and oxides . According to the analysis results, we reconstructed the paleoclimate evolutionary sequence during 30-15 cal ka BP for the Lixia River in the Subei Ba- sin.. 30.3--26.0 cal ka BP, it was a relatively warm period; 26.0--17.8 ka BP, it was cold and dry mainly, but several periods of significant fluctuations appeared, especially more significant cooling events appeared during about 21.7-21.4 cal ka BP in the middle period; 17.8--15.0 cal ka BP, it got warmer and the temperature and humidity fluctuated frequently, it was a rela- tively warm period. On the whole, the climate changes revealed by SG core sediments in the region of the Lixia River in the Su- bei Basin are not only consistent with vast research data, but also have a good correspondence with summer insolation at 30°N and 3180 record of the core 17940 in northern South China Sea. It is indicated that the climate change in the Subsea region has the global charac

关 键 词：SG钻孔 地化元素 因子分析 古环境演化 

分 类 号：X141[环境科学与工程—环境科学]