西藏吉隆盆地新近纪孢粉组合及古地理研究  

Neogene sporopollen assemblages and paleogeographyin the Gyirong basin,Tibet

作　　者：孙黎明[1] 阎同生[2] 唐桂英[1] 丁小燕 王瑞君 田立富[1] 

机构地区：[1]石家庄经济学院工程学院,河北石家庄050031 [2]河北师范大学资源与环境学院,河北石家庄050016 [3]河北省地理科学研究所,河北石家庄050011

出　　处：《中国地质》2007年第1期49-54,共6页Geology in China

基　　金：中国地质调查局地质大调查项目(2001300009181)

摘　　要：西藏吉隆盆地沃马组发现的孢粉组合佐证了青藏高原在上新世晚期持续稳定的隆升。该盆地强波沟剖面共划分了6个孢粉组合带,古植被是以松和冷杉为建群种的亚热带山地针阔叶林植被,反映了温暖湿润的古气候环境,期间经历几次明显的气候冷暖波动;沃马组岩相古地理分析表明:沃马组沉积环境主要是河流和湖泊沉积环境,局部地区为冲积扇及沼泽环境。其古地理环境演化经历了早期形成阶段、半开放式湖盆阶段及封闭式湖盆3个演化阶段。The sporopollen assemblages discovered in the Woma Formation in the Gyirong basin, Tibet, provide evidence for continuous and stable uphft of the Qinghai-Tibet Plateau during the Phocene. Six assemblage zones may be distinguished in the Woma Formation in the Gyirong basin. The paleovegetation of the Woma Formation is characterized by subtropical, mountainous, needleleaf and broadleaf forest with l＇h＇nus and Abies as the constructive species, reflecting a warm-moist paleochmatic environment. During the period, there occurred several pronounced climatic cold-warm fluctuations. Analysis of the hthofacies and paleogeography of the Woma Formation indicates that the depositional environment of the Woma Formation was mainly the fluvial and lacustrine one and locally the alluvial fan and swampy one. The evolution of the paleogeographic environment of the Woma Formation progressed through three stages, namely, the early formation stage, semi-open lake basin stage and enclosed lake basin stage.

关 键 词：吉隆盆地 沃马组 孢粉组合 古地理环境 

分 类 号：P531[天文地球—古生物学与地层学]