ZHANG Wei-wei，SHU Qiang，CHEN Ye，ZHAO Zhi-jun，ZHANG Mao-heng
（College of Geography Science, Nanjing Normal University, Key Laboratory of Environmental Evolution and Ecological Construct of Jiangsu Province, Nanjing210023, China）

Abstract: 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, expect 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°08′N，119°43′E) , which is 1km 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 14C 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 Basin: 30.27-25.96 cal ka BP, it was a relatively warm period. During 28.1-27.5 cal ka BP, the SG profiles recorded a brief dry event；25.96-17.75 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; 17.75-14.96 cal ka BP, it got warmer and the temperature and humidity fluctuated frequently, it was a relatively warm period. On the whole, the climate changes revealed by SG core sediments in the region of the Lixia River in the Subei Basin are not only consistent with vast research data, but also have a good correspondence with summer insolation at 30°N and δ18Ｏ record of the core 17940 in northern South China Sea. It is indicated that the climate change in the Subsea region has the global characteristics.

Key words: SG core; geochemical element; factor analysis; evolution of paleoenvironment

EARTH AND ENVIRONMENT Vol. 42, No.5, Tot No.301, 2014, Page 583-588