江苏丰参一井泰州组孢粉资料及白垩系-古近系界线  

POLLEN ASSEMBLAGES FROM THE TAIZHOU FORMATION OF NORTHERN JIANGSU PROVINCE WITH DISCUSSION ON THE K-Pg BOUNDARY

作　　者：刘耕武[1] 陈丕基[1] 曹美珍[1] 

机构地区：[1]中国科学院南京地质古生物研究所,江苏南京210008

出　　处：《地层学杂志》2013年第3期275-282,共8页Journal of Stratigraphy

基　　金：中国地质调查局(1212011120145);全国地层委员会"中国主要断代地层建阶研究"项目资助

摘　　要：江苏北部丰参一井泰州组孢粉植物群可以分为上下两个组合,暂时借用宋之琛等(1981)提出的组合名称来命名当前的组合:上部组合命名为Ulmipollenites-Podocarpidites-Jianghanpollis组合,以榆科和松科花粉高含量为特征;下部组合命名为Classopolis-Exesipollenites-Schizaeoisporites组合,含丰富的克拉梭粉属(Classopollis)、隐孔粉属(Exesipollenites)、希指蕨孢属(Schizaeoisporites)、凤尾蕨孢属(Pterisosporites)等常见于白垩纪的孢粉类型。考虑到下部组合的上部时代属于晚白垩世晚期,而上部组合既有少许Paraalnipollenite,Momipites等出现,也有个别江苏粉、江汉粉等存在,时代上难以排除晚白垩世晚期的可能。在丰参一井的白垩系-古近系界线具体位置也难以确定,虽然我们倾向将界线置于2774m,但根据目前资料,井深2815m,2747m,或者甚至2716m上下都有可能。在丰参一井既没有发现可以和北美西部相应层位直接对比的白垩系-古近系界线附近的孢粉组合,也没有见到所谓的孢子高含量组合的层位,因此也不能肯定是否存在白垩系-古近系界线沉积。由于丰参一井的采样密度比较低,也不能轻易排除因为采样密度不够而遗漏了界线沉积的可能性。江苏北部不属于真正的鹰粉区,不宜和我国东北以及北美西部进行直接对比,其界线附近的孢粉植物群面貌和演变情况还需要进一步探索。The palynoflora from the Taizhou Formation of the Fengcan No. 1 drill-core in Dafeng County of northern Jiangsu contains abundant pollen. The pollen sequence can be divided into two assemblages andfive sub-assemblages. The assemblages are named following Song Z. S. ~ Qian Z. S. （1989）. The upper assemblage is called the Ulmlpollenites-Podocarpidites-Jianghanpollis assemblage （after Song Z. S. Qian Z. S. , 1989）. Its main characteristic is the rich occurrence of Ulmaceae and Pinaceae pollen. Angio- sperm pollen types dominate the assemblage, mainly are Ulmipollenites, Ulmoideipites, Subtriporopolle- nites, Plicapollis with various tricolpate, tricolporate and polyporate pollen. It also contains some rare but significant types, e. g. Paraalnipollenites, Nyssapollenites, Momipites. The most important gymno- sperm pollen are Pinuspollenites, Cedripites, and Podocarpidites. Pteridophyte spores are less than pol- len and mainly consist of Pterisosporites, Trilobosporites, Deltoidospora, Klukisporites. Based on the vertical changes of Pinuspollenites, Ulmipollenites, Podocarpidites, Trilobosporites etc. this assemblage can be separated into three subassemblages. We are inclined to assign a latest Cretaceous to Early Paleo- cene age for the upper assemblage considering the co-existence of rare Momipites, Paalnipollenites, etc. and individual Jiangsupollis, Jianghanpollis. The lower assemblage, i.e. Classopolis-Exesipollenites- Schizaeoisporites assemblage （after Song Z.S. ＆ Qian Z. S. , 1989）, is distinguished from the upper one in having more abundant Cretaceous types, such as Classopollis, Exesipollenites, Schizaeoisporites, Pterisosporites. Ulmaceae and Pinaceae pollen generally become much less important than those in the up- per assemblage. The abundant Cretaceous pollen suggests a Late Cretaceous age for the lower assemblage. Presence of rare Marsypiletes, Liliacidites complexus, Jianghanpollis and Jiangsupollis suggests that this unit presents the Wodehouseia spinita zone of Late Maastrichtian in its

关 键 词：生物地层 孢粉植物群 白垩系-古近系界线 泰州组 白垩纪 江苏 

分 类 号：P534.53[天文地球—古生物学与地层学]