南海ODP184航次1148站位渐新世沟鞭藻生物地层OLIGOCENE DINOFLAGELLATE BIOSTRATIGRAPHY IN NORTHERN SOUTH CHINA SEA, SITE 1148 OF ODP LEG 184
李杰,茅绍智,吴国,秦晓丹
摘要(Abstract)：
大洋钻探184航次1148站位从南海当前的深海陆坡区取得了距今32.8Ma以来的沉积纪录,其中渐新世(32.8—23.8Ma)沉积包含了丰富的沟鞭藻化石,通过定量和定性结合的分析方法对沟鞭藻进行了研究。依据可指示地层时代关键种的最高产出层位和沟鞭藻组合特征,建立了1个组合带和2个亚带:Cleistosphaeridium diver-sispinosum组合带(A带)、Enneadocysta pectiniformis亚带(A-1亚带)和Cordosphaeridium gracile亚带(A-2亚带)。由Cl.diversispinosum、Co.gracile、Hystrichokolpoma pusillum和Homotryblium vallum的最高产出层位标定A带顶界,时代为渐新世;据Enneadocysta partridgei和E.pectiniformis最高产出层位划分出A-1亚带和A-2亚带;由E.partridgei,E.pectiniformis和Phthanoperidinium amoenum的生存时限可确定A-1亚带为早渐新世鲁培尔期(Rupelian);由Co.gracile,Distatodinium ellipticum,Wetzeliella articulata,W.gochtii和W.symmetrica等种的最高产出层位和分布时限可确定A-2亚带为晚渐新世夏特期(Chattian)。根据共存的沟鞭藻属种特征,新建立的化石带在不同程度上可与世界其他地区的同期沟鞭藻化石带或组合带进行对比,某些关键沟鞭藻种共存有助于确定化石带的年龄。
关键词(KeyWords)： 沟鞭藻;生物地层;渐新世;大洋钻探;南海北部
基金项目(Foundation): 国家自然科学基金项目(No.49999560、No.40102029)资助。
作者(Author): 李杰,茅绍智,吴国,秦晓丹
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