江苏盐城大丰滨海岩芯中的全新世介形类及古环境变迁  

HOLOCENE OSTRACODES IN A CORE FROM THE DAFENG COAST,YANCHENG CITY,JIANGSU PROVINCE AND THEIR PALEOENVIRONMENTAL IMPLICATIONS

作　　者：王雨楠 周保春[1] 李保华[2] 王亚琼[2] WANG Yunan;ZHOU Baochun;LI Baohua;WANG Yaqiong(Shanghai Natural History Museum,Branch of Shanghai Science and Technology Museum,Shanghai 200041,China;Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[1]上海自然博物馆(上海科技馆分馆),上海200041 [2]中国科学院南京地质古生物研究所,南京210008

出　　处：《微体古生物学报》2023年第1期43-52,共10页Acta Micropalaeontologica Sinica

基　　金：中国科学院战略性先导科技专项B类项目(XDB26000000);现代古生物学和地层学国家重点实验室开放课题(213122)资助。

摘　　要：本文对江苏省盐城市大丰野鹿荡DF20岩芯(北纬33°3.14′,东经120°48.05′,岩芯长21 m)中的全新世介形类进行了研究。从该岩芯的61个沉积物样品中获取介形类壳瓣逾1700枚,鉴定出35属45种,这些属种被划归三个生态分布型,按个体数量由多到少顺序分别为滨岸低盐水型(Sinocytheridea impressa,Neomonoceratina dongtaiensis,Leptocythere ventriclivosa等)、内陆架沿岸水型(Pistocythereis bradyformis,Bicornucythere bisanensis等)以及中陆架外海水型(Munseyella pupilla,Cytheropteron cf.sawanense等)。介形类个体密度及生态分布型组合变化,显示近7000年来野鹿荡地区经历了三个沉积时期:I期(孔深19.6~7.5 m),处于潮下带,砂质底,海藻/海草繁茂,底栖生物生产力水平较高;Ⅱ期(7.5~2 m),由潮下带急速过渡为潮间带,泥质底,底栖生物生产力水平低;Ⅲ期(2~0.85 m),处于潮下带,砂质底,底栖生物生产力水平低。The Holocene ostracodes from Core DF20 taken from the Dafeng coast of the southern Yellow Sea(33°3.14′N,120°48.05′E;core length 21 m)were studied.A total of 61 samples from the core were quantitatively analyzed for paleontological study of ostracodes as well as their paleoenvironmental implications.Over 1700 ostracode valves,which were identified as 45 species belonging to 35 genera,were obtained from these samples.These species were grouped into three types of ecological distribution,namely,hypohaline water of littoral zone type(including Sinocytheridea impressa,Neomonoceratina dongtaiensis and Leptocythere ventriclivosa),coastal water of inner shelf type(including Pistocythereis bradyformis and Bicornucythere bisanensis),and open-sea water of middle shelf type(including Munseyella pupilla and Cytheropteron cf.sawanense).Three depositional periods(I,II,and III)in the core were discriminated by ostracode assemblages and the corresponding paleoenvironments were reconstructed.Period I(19.6~7.5 m)corresponds to high-productivity subtidal zone with sandy bottom and rich seagrass and/or seaweeds;period II(7.5~2 m),to low-productivity tidal zone with muddy bottom;and period III(2~0.85 m),to low-productivity subtidal zone with sandy bottom.

关 键 词：介形类 古环境 全新世 大丰野鹿荡 

分 类 号：Q911[天文地球—古生物学与地层学] P534.632[生物学—古生物学]