琼东南盆地渐新统--上新统孢粉、藻类记录  

SPORES,POLLEN,FRESHWATER ALGAE AND DINOFLAGELLATE CYSTS RECORDED IN THE OLIGOCENE——PLIOCENE FROM THE SOUTHEAST HAINAN BASIN,SOUTH CHINA SEA

作　　者：覃军干[1,2] 吴国瑄[3] 李君[2] 王任[2] 谢金有 张强[1] 

机构地区：[1]中国地质科学院岩溶地质研究所国土资源部/广西壮族自治区岩溶动力学重点实验室,桂林541004 [2]中海油能源发展股份有限公司工程技术分公司,湛江524057 [3]同济大学,上海200092 [4]中海石油(中国)有限公司湛江分公司,湛江524057

出　　处：《微体古生物学报》2016年第4期335-349,共15页Acta Micropalaeontologica Sinica

基　　金：广西自然科学基金项目(批准号:2012GXNSFCA053008);中海油能源发展股份有限公司项目(HFKJ-CJF1202)资助

摘　　要：本次工作对来自南海北部大陆架地区琼东南盆地LS33-1-1井和LS2-1-1井渐新统—上新统的孢粉、藻类进行了系统研究。通过孢粉分析,确定孢粉植物群,恢复古植被,推测古气候,建立了与气候变化趋势相关的孢粉组合序列。结果显示,研究区内渐新统崖城组、陵水组时期的植被类型是热带、亚热带常绿阔叶林及针叶、常绿、落叶阔叶混交林,气候条件较温凉湿润;中新统三亚组时期植被发展为热带、亚热带常绿阔叶林及常绿、落叶阔叶混交林,气候条件暖而湿润;中新统梅山组时期是气候逐渐变化的过渡期;中新统黄流组的植被类型为亚热带针叶阔叶、常绿和落叶阔叶混交林,气候条件温凉略干燥;上新统莺歌海组山地植被中针叶林或针阔叶混交林多有分布,常绿阔叶落叶阔叶林混交林继续扩大,草本植物空前发展,气候趋于凉干。孢粉组合所反映的渐新世—上新世气候变化特征与全球气候变化趋势具有较好的可比性。通过孢粉、藻类资料对沉积环境进行了初步研究,研究区渐新世以近岸浅海的沉积环境为主,为陆架边缘到内陆架区,中新统梅山组及其以上地层应形成于距岸较远海水较深的浅海环境。Spores, pollen, freshwater algae and dinoflagellate cysts in the Oligocene--Pliocene of Well LS33-1-1 and Well LS2-1-1 from the Southeast Hainan basin, South China Sea were analyzed. The results disclosed the changes of paleovegetation, paleoclimate and depositional paleoenvironment. The vegetation during the formation of the Yacheng and Lingshui Formations was tropical, subtropical evergreen broadleaved,forest and evergreen broadleaved-coniferous mixed forest, suggesting a relatively cool＇and humid climate condition. The Sanya Formation witnessed the vegetation of tropical, subtropical evergreen forest and evergreen broadleaved mixed forest, indicating that the climate was warm and humid. The period of the Meishan Formation was a transition of climate change. Vegetation of the Huangliu Formation was subtropical evergreen broadleaved and con]fer ous mixed forest and the ciimate was cool and dry. With the increase of herb pollen in the top layer, the Yinggehai Formation confirmed that the climate was cool and dry, The trend of climate change recorded in the Qligocene--Pliocene of the Southeast Hainan basin shared the same characteristic of the global climate change. Depositional environment of the study area during the Oligocene might be a costal shallow sea, while during the formation of the Meishan Formation it might evolve to a shelf condition.

关 键 词：孢粉 淡水藻类 沟鞭藻类 渐新统 上新统 琼东南盆地 南海 

分 类 号：Q914[天文地球—古生物学与地层学] P532[生物学—古生物学]