渤海海域渐新世孢粉、藻类及介形类生态与环境——以曹妃甸5-5构造为例  

THE OLIGOCENE PALEOECOLOGY AND ENVIRONMENT ASSOCIATION WITH SPOROPOLLEN,ALGAE AND OSTRACODE IN THE CAOFEIDIAN 5-5 TECTONIC REGION IN BOHAI GULF

作　　者：陈书伟 王波 齐玉民 赵都菁 潘文静 庾永钊 CHEN Shuwei;WANG Bo;QI Yumin;ZHAO Dujing;PAN Wenjing;YU Yongzhao(CNOOC EnerTech-Drilling&Production Co,Tianjin Tanggu 300452;CNOOC(China)Co.Ltd.Tianjin Branch,Tianjin Tanggu 300459)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津塘沽300452 [2]中海石油(中国)有限公司天津分公司勘探开发研究院,天津塘沽300459

出　　处：《微体古生物学报》2023年第3期235-251,共17页Acta Micropalaeontologica Sinica

摘　　要：曹妃甸5-5构造A探井15块岩心和23包岩屑样中含丰富的孢粉、藻类、疑源类以及介形类化石,包括Meliaceoidites-Quercoidites和Ulmipollenites undulosus-Piceaepollenites 2个孢粉组合,Sentusidinium-Leiosphaeridia-Cleistosphaeridium minor,Dictyotidium-Rugasphaera,Gonyaulacysta-Palaeoperidinium 3个藻类、疑源类组合,以及Phacocypris huiminensis,Dongyingia gracilinflexicostata-Chinocythere subtriangulata 2个介形类组合。根据微体古生物、岩矿和地球化学检测结果分析:该构造中沙河街组一段上亚段至东营组二段下亚段为连续沉积。沙河街组一段沉积时期湖岸形成生物礁或滩。东营组三段沉积初期发生短暂海水影响并带来适应咸水藻类,同时陆源淡水快速注入,造成淡水藻类与咸水-半咸水藻类汇聚共生,最终形成滨浅湖—半深湖。环境由炎热潮湿的亚热带气候转变为温暖干燥的温带气候。In this study,we analyze 15 cores and 23 samples from the Well A in Caofeidian 5-5 tectonic region of the Bohai Gulf.There are two palynology assemblages are recognized,such as the Meliaceoidites-Quercoidites assemblage and the Ulmipollenites undulosus-Piceaepollenites assemblage. Three algae assemblage of the SentusidiniumRhombodella assemblage, the Dictyotidium-Rugasphaera assemblage and the Gonyaulacysta-Palaeoperidiniumassemblage are erected. Two ostracod assemblages are established as the Phacocypris huiminensis assemblage and the Dongyingia gracilinflexicostata-Chinocythere subtriangulata assemblage. In addition to the paleontology records, the geochemical results indicate that a continuous sedimentary sequence develops in Well A of the CFD5-5 tectonic region and groups of biological beach or reefs could be made up during the first member of the Shahejie Formation. In the initial stage of the third member of the Dongying Formation, a temporary transgression possibly affected there and brought abundant alga in saline water. At the same time, terrestrial water rapidly injected with fresh water algae. Therefore, a special ecosystem was composed by two opposite salinity algae groups existing together and a shore lake or semi-deep lake formed eventually. The environment changed from a hot humid subtropical climate to a warm dry temperate climate.

关 键 词：孢粉 藻类 介形虫 古环境 古气候 渐新世 渤海海域 

分 类 号：Q911[天文地球—古生物学与地层学] P736.22[生物学—古生物学]