西藏札达盆地上新世托林组剖面环境变化记录  

Records of Environmental Change in Pliocene along Tuolin Formation in Zanda Basin,Tibet

作　　者：余佳[1] 罗鹏[2] 韩建恩[1] 孟庆伟[1] 吕荣平[1] 孟宪刚[1] 朱大岗[1] 邵兆刚[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]长安大学资源学院,陕西西安710054

出　　处：《地球学报》2007年第4期341-348,共8页Acta Geoscientica Sinica

基　　金：国家自然科学基金项目(编号:40572134);中国地质调查局项目"青藏高原第三纪重点古湖泊环境演变序列"(编号:200313000066)联合资助

摘　　要：对西藏札达盆地上新世托林组的孢粉、沉积物粒度、磁化率、碳酸盐、易溶盐和ESR年代等测试数据的综合分析,得到5·40～4·40Ma时期环境变化的丰富信息。5·24～4·72Ma时期,气候温凉干旱,属于针阔叶疏林草原环境特征;4·72～4·67Ma时期,河流水量增多,气候湿润,孢粉组合表现出温带森林草原环境特征;4·67～4·40Ma时期,气候进一步向温暖湿润方向发展,属于暖温带针阔叶混交林环境特征。Based on an analysis of such measured data of environmental proxies as sporopollen, grain size, magnetic sus- ceptibility, carbonate content, soluble salts and ESR dating, It is held that Tuolin section contains abundant information of environmental changes from 5.40 Ma to 4.40 Ma. During 5.24 - 4.72 Ma, the climate was warm and dry, and the forest vegetation consisted of needle leaf and broadleaf veld; during 4.72 - 4.67 Ma, the river flow increased, the climate was warm and wet, and the vegetation comprised temperate forest and veld; during 4-. 67-4.40 Ma, the climate became more and more warm and wet, and the vegetation was composed of warm temperate deciduous and broadleaf veld.

关 键 词：西藏 札达盆地 托林组剖面 环境变化 

分 类 号：P931[天文地球—自然地理学]