摘要
提要本次工作对南海琼东南盆地深水区松南凹陷ST35-A井2005~3285.85 m井段70个样品进行了沟鞭藻分析,发现了较丰富的沟鞭藻化石,其中含中新统重要指示种Tuberculodinium vancampoae,Hystrichosphaeropsis obscura和Selenopemphix quanta,表明该井段的地质时代为中新世。根据沟鞭藻属种面貌及丰度研究结果,研究区海水表层温度在中新世经历了3次变化:(1)早中新世早期-早中新世末期(3285.85~2900 m),沟鞭藻以喜暖的Spiniferites spp.为主,喜极暖的Polysphaeridium zoharyi含量相对较低,喜凉的Operculodinium centrocarpum含量中等,相对海水表层温度指数(W/C)均值为0.59,指示海水表层温度较温暖;(2)早中新世末期-中中新世(2886~2350 m),Spiniferites spp.和Polysphaeridium zoharyi含量均有上升的趋势,Operculodinium centrocarpum含量明显下降,W/C均值为0.72,海水表层温度较前一阶段明显上升并达到峰值,可能与中中新世气候最适宜温暖期相对应;(3)晚中新世(2340~2005 m),Operculodinium centrocarpum含量上升,Spiniferites spp.和Polysphaeridium zoharyi含量下降,W/C指数均值为0.50,指示表层海水温度相对较凉。
70 samples were collected for organic-walled dinoflagellate cyst from the interval 2005~3285.85 m of Well ST35-A in Songnan Sag,Qiongdongnan Basin,South China Sea.Abundant dinoflagellates were found in most samples.It contains the Miocene index species Tuberculodinium vancampoae,Hystrichosphaeropsis obscura and Selenopemphix quanta, indicating that the stratigraphic age of this interval is Miocene. Based on the species appearance and abundanceof dinoflagellate, the sea surface temperature has undergone three changes during the Miocene, namely: (1) EarlyMiocene–late Early Miocene (3 285.85~2 005 m), it is dominated by Spiniferites spp., with relatively low content ofPolysphaeridium zoharyi, which likes extreme warm, and moderate content of Operculodinium centrocarpum, with a meanW/C of 0.59, indicating a warm surface water temperature. (2) Late Early Miocene–Middle Miocene (2 886~2 350 m),Spiniferites spp. and Polysphaeridium zoharyi increased while Polysphaeridium zoharyi decreased, the average W/Cindex is 0.72. The sea surface temperature increased significantly compared with the previous stage and reached a peak,which may correspond to the most suitable warm period of the Middle Miocene climate. (3) Late Miocene (2 340~2 005m), Operculodinium centrocarpum content increased, Spiniferites spp. and Polysphaeridium zoharyi decreased, with anaverage W/C index of 0.50, indicating relatively cool surface water temperature.
作者
王任
覃军干
杨锐
闫琢玉
崔书姮
阮枝梅
黄智进
魏文艳
祝幼华
WANG Ren;QIN Jungan;YANG Rui;YAN Zhuoyu;CUI Shuheng;RUAN Zhimei;HUANG Zhijin;WEI Wenyan;ZHU Youhua(CNOOC Energy Technology&Services Oil Field Engineering Research Institute,Drilling&Production Zhanjiang,Zhanjiang 524057,China;Guangdong Province Key Laboratory of Exploration and Development of the South China Sea Complex Oil and Gas Reservoirs,Zhanjiang 524057,China;CNOOC Energy Technology&Services Oil Field Engineering Research Institute,Drilling&Production,Tianjin 300452,China;Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China)
出处
《微体古生物学报（中英文）》
CSCD
北大核心
2024年第3期219-231,共13页
Acta Micropalaeontologica Sinica
基金
广东省软科学研究计划(2018B030323028)
中海石油(中国)有限公司科研项目(YXKY0ZX03-2021)共同资助。
关键词
沟鞭藻
海水表层温度
中新世
松南凹陷
琼东南盆地
南海
Dinoflagellates
sea surface temperature
Miocene
Songnan Sag
Qiongdongnan Basin
South China Sea
作者简介
通讯作者:祝幼华,E-mail:yhzhu@nigpas.ac.cn。
