大杨树盆地嫩江组孢粉化石及其地质意义  

Sporopollen fossils of the Nenjiang Formation in Dayangshu Basin,and their geological significance

作　　者：孙雷[1] 王成龙 卞雄飞[1] 张健[1] 陈树旺[1] 苏飞[1] 汪博 张海华[1] SUN Lei;WANG Chenglong;BIAN Xiongfei;ZHANG Jian;CHEN Shuwang;SU Fei;WANG Bo;ZHANG Haihua(Shenyang Center of Geological Survey,China Geological Survey,Shenyang,Liaoning 110034,China;School of Earth Sciences,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;Shaanxi No.2 Comprehensive Geophysical Prospecting Brigade Company Limited,Xi'an,Shaanxi 710000,China)

机构地区：[1]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [2]东北石油大学地球科学学院,黑龙江大庆163318 [3]陕西地矿第二综合物探大队有限公司,陕西西安710000

出　　处：《东北石油大学学报》2021年第3期44-53,110,I0003,I0004,共13页Journal of Northeast Petroleum University

基　　金：国家重点研发计划项目(2019YFC06054);中国地质调查局项目(DD20190097);中国地质调查局项目(DD20190379);中国地质调查局项目(DD20160163);东北石油大学人才引进科研启动项目(1305021848)。

摘　　要：大杨树盆地是松辽盆地外围重要的具有油气勘探潜力的中生代盆地。研究大杨树盆地嫩江组露头样品孢粉化石,建立雪松粉Cedripites—罗汉松粉Podocarpidites—雏囊粉Parcisporites组合。结果表明:大杨树盆地嫩江组建立的孢粉化石组合以三缝类孢子和双气囊类花粉为主,Schizaeoisporites属、Cyathidites属和被子植物花粉的质量分数较低,Classopollis属未见,组合特征与以往建立在松辽盆地的嫩江组孢粉组合明显不同。Lytharites、Pentapollenites、Callistopollenites、Consoliduspollenites、Retitricolpites和Borealipollis等具有时代意义的被子植物花粉化石的出现,明确大杨树盆地嫩江组的沉积时代为晚白垩世Campanian期。大杨树盆地嫩江组沉积时期古植被以松柏类、真蕨类和石松类为主,古气候环境属于湿润的亚热带。该结果对大杨树盆地地层及古气候研究具有指导意义,为盆地油气勘探提供基础地质支撑。Dayangshu Basin is one of the peripheral basins of Songliao Basin,which is an important Mesozoic basin with oil and gas exploration potential.The palynological fossils found in outcrop samples of Nenjiang Formation in Dayangshu Basin have been systematically studied,a sporopollen assemblage of Cedripites-Podocarpidites-Parcisporites was established.The results show that the assemblage is characterized by the dominance of triletes spore and disaccites gymnosperm pollen,while the amount of Schizaeoisporites,Cyathidites and angiosperm pollen is low,no Classopollis.The characteristics of this assemblage are obviously different from those of the Nenjiang Formation established by previous researchers in the Songliao Basin.The geological age of Nenjiang Formation in Dayangshu Basin is considered to be Campanian of Late Cretaceous as the emergence of some epochal fossils of angiosperm pollens such as Lytharites,Pentapollenites,Callistopollenites,Consoliduspollenites,Retitricolpites and Borealipollis.According to the palynological data,it is inferred that the paleo vegetation in the deposition period of Nenjiang Formation of Dayangshu Basin is mainly pinaceae,filicales and lycopodia,and the paleoclimate environment belongs to humid subtropical zone.These are of great significance to the research of the strata and paleoclimate and provide basic geological support for oil and gas exploration in Dayangshu Basin.

关 键 词：大杨树盆地 嫩江组 孢粉组合 Campanian期 晚白垩世 古植被与古气候 

分 类 号：P532[天文地球—古生物学与地层学] P534.53[天文地球—地质学]