东昆仑万宝沟岩群基质地层中发现白垩纪孢粉组合  

Discovery of the Cretaceous sporopollen assemblage in the matrix strata of the Wanbaogou Group-complex in the East Kunlun orogenic belt,China.

作　　者：郭宪璞[1] 王乃文[1] 丁孝忠[1] 王大宁[1] 赵民[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《地质通报》2007年第12期1611-1619,共9页Geological Bulletin of China

基　　金：国家自然科学基金面上项目(编号:40272019);中国地质调查局项目(编号:200313000052)资助

摘　　要：东昆仑造山带万宝沟岩群是一套混杂堆积地层,有外来岩块和基质地层之分,以往根据岩块中的化石将该套地层的时代划为前寒武纪的蓟县纪—青白口纪。根据野外调查和研究结果,曾于2005年首次报道了在昆仑桥南剖面该岩群基质地层中发现古近纪晚始新世至中—早渐新世的孢粉50属12种;同年还报道了在该岩群命名地点万宝沟剖面发现古近纪渐新世的孢粉22属15种。本次报道的是在昆仑桥北剖面该岩群基质地层中发现的早白垩世晚期—晚白垩世早期的孢粉化石43属19种(比较种)。白垩纪和古近纪孢粉化石的发现对进一步厘定该岩群的地质时代、分析其古环境及东昆仑造山带的形成演化具有重要意义。The Wanbaogou Group-complex is a mélange in the East Kunlun orogenic belt, which is composed of two parts： exotic blocks of various ages and matrix strata. On the basis of stromatolite fossils in the exotic blocks, the age of this group-complex was once assigned to the Precambrian Jixianian-Qingbaikouan. According to the field survey and research, 50 genera and 12 species of Paleogene late Eocene to mid-early Oligocene sporopollen found in the matrix strata of the group-complex at the Kunlunqiaonan section were for the first time reported in 2005. In the same year, 22 genera and 15 species of Paleogene Oligocene sporopollen were found in the Wanbaogou section-the naming site of this group-complex-were also reported. What are reported in this paper are 43 genera （sp. Incert.） and 19 species of late Early Cretaceous-early Late Cretaceous sporopollen found by the authors in the matrix strata of this group-complex and the Cretaceous Ciecctricosisporites-Sehizaeoisporites-Triporopollenites assemblage is named. The discovery of the sporopollen is of great geological significance for further defining the age of this group-complex and analyzing its paleoenvironment and the formation and evolution of the East Kunlun orogenic belt.

关 键 词：白垩纪 孢粉化石 万宝沟岩群 基质地层 东昆仑造山带 

分 类 号：P534.53[天文地球—古生物学与地层学] Q914.81[天文地球—地质学]