藏南古近系柳区砾岩孢粉化石的发现及初步研究  

DISCOVERY AND PRELIMINARY STUDY ON PALYNOFOSSILS FROM THE PALEOGENE LIUQU CONGLOMERATES IN SOUTHERN XIZANG(TIBET)

作　　者：韦利杰[1,2] 刘小汉[1] 严富华[3] 麦学舜[3] 周学君[1] 李广伟[1] 刘小兵[1] 

机构地区：[1]中国科学院青藏高原研究所,北京100085 [2]中国科学院研究生院,北京100039 [3]中国地震局地质研究所,北京100029

出　　处：《微体古生物学报》2009年第3期249-260,共12页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金重点项目(40631004)

摘　　要：作者首次对柳区砾岩夹层中的泥岩和泥质粉砂岩进行了孢粉学研究,共鉴定出52个形态属。其孢粉组合特征是:以被子植物花粉占优势(62.77%—83.19%),其次是裸子植物花粉(11.95%—32.31%),蕨类植物孢子最少(4.80%—10.38%)。被子植物花粉以具孔类为主,三孔沟或三沟类花粉在组合中有一定含量。裸子植物花粉以具双气囊类居多。孢粉植物群的总体特征表明其时代可能为古近纪晚期。当时的古植被为落叶阔叶林或针阔混交林,气候较温暖湿润,主要为暖温带的环境。This paper reports the first palynological study of interlayers of mudstones and mud-sandstone in the Liuqu Conglomerates. Fifty-two genera were identified in this palynological assesmblage. The assemblage are charaeterzed by the predominant angiosperm pollen grains （62.77 0/00--83.19 % ）. The second common group is gymnosperm pollens （11.95 %-- 32.31%）, and pteridophyte spores are relatively rare （4.80%--10.38 %）. Among the angiosperm pollens the most abundant are porate pollens, followed by tricolporate and tricolpate pollens in a moderate percentage. Bisaccate pollens dominate the gymnosperm pollens. The palynologieal assemblage from the Liuqu Conglomerates suggests a age of the Late Paleogene and a broad-leaved deciduous forest or mixed with conifer-broad-leaved forest, showing a warm-temperate climatic condition.

关 键 词：孢粉组合 柳区砾岩 雅鲁藏布江缝合带 藏南 

分 类 号：Q914[天文地球—古生物学与地层学]