| 松辽盆地D80井嫩一段介形类化石壳体特征及生物地层 |
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| 作者单位： | ;1.生物地质与环境地质国家重点实验室中国地质大学(北京);2.中国科学院南京地质古生物研究所现代古生物学与地层学国家重点实验室;3.大庆油田有限责任公司勘探开发研究院 |
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| 摘 要： | 松辽盆地嫩江组一段富含介形类化石,是系统研究Santonian期陆相介形类的理想层位。论文对中央坳陷区D80井嫩一段的介形类化石进行了系统的分类、生物地层和壳体特征分析。鉴定出介形类化石11属30种,划分出6个介形类化石带,并与前人的研究结果进行了对比;描述了该段介形类化石的壳体结构,共识别出4种壳饰类型,8种壳形结构,基于介形类壳体特征和其他证据,初步探讨了该时期湖盆湖平面的变化特征,显示出嫩一段时期松辽湖盆湖平面经历了由深逐渐变浅的过程。
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| 关 键 词： | 介形类 壳体特征 生物地层 白垩纪 嫩江组 松辽盆地 |
OSTRACODA BIOSTRATIGRAPHY AND CARAPACE CHARACTERISTICS IN THE FIRST MEMBER OF THE NENJIANG FORMATION FROM CORE D80 OF THE SONGLIAO BASIN,NE CHINA |
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| Institution: | ,State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,LPS,Nanjing Institute of Geology and Palaeontology,Exploration and Development Research Institute of Daqing Oilfield Company Ltd. |
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| Abstract: | The First Member of the Nenjiang Formation yields abundant ostracod fossils that providing ideal material to study Santonian non-marine ostracods.Based on the samples from Core D80 that located in central depression of the Songliao Basin,NE China taxonomy,biostratigraphy and carapace characteristics of the ostracod fossils have been studied in detail.In the present study,30 species assigned to 11 genera have been recognized,with six ostracoda assemblages established.In addition,we described the carapace characteristics of ostracods in this member,including 4 carapace decoration types and 8carapace shape types.Based on the carapace characteristics of the ostracods and other evidences,the lake level was reconstructed,and the lake environment changed from deep to shallow during that period of time. |
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| Keywords: | ostracods carapace characteristics biostratigraphy Cretaceous Nenjiang Formation Songliao Basin NE China |
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