渤海海域秦皇岛30地区白垩纪介形类生物组合的新发现及其古生态特征  

NEW DISCOVERY OF THE CRETACEOUS OSTRACOD ASSEMBLAGE AND ITS PALEOECOLOGICAL CHARACTERISTICS IN THE QINHUANGDAO 30 AREA OF THE BOHAI SEA

作　　者：杨娇娇 赵都菁[1] 姚雅琴[1] 曹洁 杨纪磊[1] 范晶晶 YANG Jiaojiao;ZHAO Dujing;YAO Yaqin;CAO Jie;YANG Jilei;FAN Jingjing(Engineering Technology Company,CNOOC,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术公司,天津300452

出　　处：《微体古生物学报》2023年第4期350-357,共8页Acta Micropalaeontologica Sinica

摘　　要：渤海海域一直缺乏白垩纪地层划分的古生物依据。本文通过秦皇岛30地区2口钻井473块岩屑样品的介形类分析,发现了13个属23个种,归纳为单肋女星介Cypridea unicostata-西氏枣星介Ziziphocypris simakovi介形类组合。通过分析该组合的特征分子及其他分子在国内外的地质延限分布情况,发现这一组合的时代为早白垩世瓦兰今期,地层可划归九佛堂组。渤海秦皇岛30地区所发现的这个介形类组合以中小个体卵形、椭圆形、壳面具蜂窝、肋纹的女星介Cypridea及卵形、壳面饰以脊纹的枣星介Ziziphocypris发育为特征,判断该介形类组合生活在有一定深度的浅湖环境中,结合地层岩性指示该段地层沉积时期为浅湖环境。The Bohai Sea has always lacked the palaeontological evidence for the division of Cretaceous strata.In the present paper,473 samples from two boreholes have been processed.A Cretaceous ostracod fauna which contain 13 genera and 24 species have been found,and the Timiriaservia pusilla-Cypridea yumenensis assemblage has been established for the first time in the Bohai Sea.Considering the geological range of the typical species and other species in China and abroad,the newly established ostracod assemblage suggests an Early Cretaceous Valanginian to Barremian age,and can be correlated with the Jiufutang Formation.The ostracod fauna in the QHD30 area is characterized by Cypridea and Ziziphocypris,which implies a shallow water lake environment during the deposition period,and the lithology of the strata also confirms the shallow lake environment during the same time.

关 键 词：介形类 生物地层 古生态 白垩纪 秦皇岛30地区 

分 类 号：Q914.2[天文地球—古生物学与地层学]