摘要
塔里木盆地南部地区侏罗纪的孢粉化石 ,可分为 5个孢粉组合 :1) Cyathidites- Classopollis组合 ;2 ) Disac-ciatrileti- Cyathidites- Classopollis- Quadraeculina组合 ;3) Disacciatrileti- Cyathidites- Classopollis- N eoraistrackia组合 ;4) Disacciatrileti- Cyathidites- Classopollis组合 ;5 ) Cyathidites- Classopollis- Disacciatrileti组合。这些组合与塔北地区的组合明显不同 ,与我国华南亚区侏罗纪孢粉组合基本一致 ,属于华南侏罗纪孢粉植物地理亚区的范畴 ,而塔北地区的组合与我国华北亚区侏罗纪孢粉组合大体一致 ,属于华北侏罗纪孢粉植物地理亚区的范畴。因此 ,塔里木盆地侏罗纪孢粉植物地理分区界线应划在盆地的近中间 。
Jurassic strata are widely distributed in Tarim Basin and rich in fossil spores and pollen grains. According to the present data, two Jurassic palynofloras occupy the South Tarim and the North Tarim palynofloral provinces. For each palynoflora an assemblage sequence is proposed and described. The southern flora is composed of five assemblages (in ascending order): 1. Cyathidites-Classopollis Assemblage; 2. Disacciatrileti-Cyathidites-Classopollis-Quadraeculina Assemblage; 3. Disacciatrileti-Cyathidites-Classopollis-Neoraistrackia Assemblage; 4. Disacciatrileti-Cyathidites-Classopollis Assemblage; and 5. Cyathidites-Classopollis-Disacciatrileti Assemblage. The northern flora includes assemblages: 1. Disacciatrileti-Cyathidites Assemblage; 2. Cyathidites-Cibotiumspora-Disacciatrileti Assemblage; 3. Cyathidites-Neoraistrickia-Disacciatrileti Assemblage; and 4. Cyathidites-Classopollis Assemblage. There are clear differences in the Jurassic palynological floras between South Tarim and North Tarim provinces. A preliminary study shows that the sporopollen fossils from South Tarim are close to those of South China, the sporopollen assemblages from the North Tarim are similar to those of North China. According to Vakhrameev (1988), South China Jurassic Floral Province is an important part of the East Asia Province in the Europe-China Region. The flora of North China falls into the Siberia Region. Thus, the boundary between the South and North Tarim provinces should be shifted northward to central Tarim, extending in northwest-southeast direction. The above boundary separated the Tarim Sporopollen Province into two different sporopollen subprovinces, namely the South Tarim Palynofloras province and North Tarim Palynofloras province (Fig.1).
出处
《地层学杂志》
CSCD
北大核心
2002年第1期18-26,共9页
Journal of Stratigraphy
基金
"八五"国家科技攻关"塔里木盆地油气资源 ( 85 -10 1)"项目
