摘要
本文依据沉积物的颜色、粒度、层理、岩性组合等特征，并参照磁性地层、磁化率、碳酸盐含量、总有机碳及碳氮比值等环境指标，初步建立云南鹤庆盆地约６００ｋａＢＰ以来的古环境演化历史。研究表明，在大阶段上环境变化存在着两次明显的转型，这可能是与构造运动驱动有关。在剖面４．１ｍ处，约１４．２ｋａＢＰ，湖盆被河流切开，导致环境指标突变。
The environment evolution history of the Heqing Basin since 600 ka B P has been established based on the analysis of the colour,granularity,stratification and lithological assemblage of the sediments from the HQ core in combination with the study of the magnetic stratigraphy,susceptibility,content of carbonates,total organic carbon and the carbonlnitrogen ration of the sequence.There were two distinet tranformations of the enviroment connected to the tectonic movement.At a depth of 4.1m of the column,the lake basin was entrenched by rivers at about 14.2 ka B P,leading to a sudden change of the envionment.
出处
《地质力学学报》
CSCD
1998年第4期76-81,共6页
Journal of Geomechanics
基金
自然科学基金
中国科学院重大项目
国家科委攀登项目
关键词
HQ孔
沉积特征
古环境变迁
盆地
第四纪
HQ core
sedimentary characteristics
palaeoenvironment evolution
