摘要
本文阐述了沉积物矿物磁性测量的基本原理和方法,井对云南滇池草2孔进行了矿物磁性侧量,结合沉积物矿物组合、地球化学性质、粒度、抱粉等分析和测试结果,对云南昆明盆地盘龙江三角洲的环境变化进行了初步探讨。
Mineral magnetic measurement was applied to the lake sediment core Chao-Ⅱ derived from the northeast shore of Dianchi, Yunnan Province, as a case of paleoenvironmental study on the basis of magnetic stratigraphy. The results show that there are two significant changes of magnetic minerology around depth 0.9 m and 6 m, respectively. Combining these preliminary results with the analysis of pollen content, particle constitution, geochemistry,mineral component as well as radiocarbon chronology, an outline of the environmental changes in Dianchi Lake is proposed in the paper, which indicates that Dianchi Lake was bigger in the Late Pleistocene than present and considerable scale of lake transgression happened around the end of the Pleistocene. It is suggested that the surface of Dianchi Lake began to reduce from the Early Holocene, corresponding to the climate change of Kunming Basin.
出处
《地理科学》
CSSCI
CSCD
北大核心
1991年第2期182-194,共13页
Scientia Geographica Sinica
基金
国家自然科学基金资助
关键词
沉积物
矿物
磁性测量
古环境
变化
Sediments
Mineral magnetic measurement
Environmental changes
