中山大学学报（自然科学版）2012，Vol.51Issue(3)：121-127,7.
田洋玛珥湖中更新世以来磁化率特征及其环境意义
Characteristics and Environmental Significance of Magnetic Susceptibility of the Tianyang Maar Lake since Middle Pleistocene
摘要
Abstract
The Tianyang Maar Lake is situated in the southeastern Leizhou Peninsula, the transitional climate zone between tropical and subtropical region of China. In this paper, a study was carried out on the upper 40 meters of core TYC collected from the Tianyang Maar Lake. The results suggest that magnetic susceptibility (MS) correlates well with pollen records. Thus, variations of MS can be used as an indicator for climate and environmental changes in the Tianyang Maar Lake. Generally, a low MS indicates a warm and humid environmental condition, while a high MS suggests a cold or cool environment. Results of the MS analysis suggest that the environmental history of the Tianyang Maar lake area since the Middle Pleistocene can be divided into 9 stages; 346 ~301.4 ka BP, the climate was relatively warm and humid. 301. 4 -248. 8 ka BP, the climate became relatively cool and dry. 248. 8 ~ 188. 8 ka BP, the climate was warm and humid. 188. 8 ~ 125. 2 ka BP, it was cold and dry. 125. 2 - 69. 3 ka BP, the climate was relatively warm and humid. 69. 3 -40. 43 ka BP, the climate was cool. 40. 43 -25. 5 ka BP, the climate was cool and the temperature was lower than the former stage, with a swamping transitional environment in Tianyang Maar Lake. 25.5 - 10.8 ka BP, the climate got even colder and drier, the water of Tianyang Maar Lake almost dried up. During the last 10. 8 ka BP, the existence of human activities has probably resulted in high MS values.关键词
玛珥湖/中更新世/磁化率/孢粉/热带华南Key words
Maar lake/ the middle Pleistocene/ magnetic susceptibility/ pollen/ tropical South China分类
天文与地球科学引用本文复制引用
杨士雄,郑卓,宗永强,李杰,黄康有..田洋玛珥湖中更新世以来磁化率特征及其环境意义[J].中山大学学报（自然科学版）,2012,51(3):121-127,7.基金项目
国家自然科学基金资助项目(41072128) （41072128）
中山大学学校基本科研业务费专项基金资助项目(101gzd08) （101gzd08）
