Miocene to Pleistocene dinoflagellate cysts in ODP Sites 133-815 and 133-823@en
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Well-preserved and diverse dinoflagellate cyst assemblages were recovered from Ocean Drilling Program (ODP) Sites 815 and 823. The late middle Miocene is indicated by the presence of Sumatradinium spp. up to Core 133-823C-10R at Site 823 and up to Core 133-815B-47X at Site 815. Melitasphaeridium choanophorum appeared in the late Miocene (Cores 133-823C-19R and 133-815B-45X) and disappeared during the late Pliocene (Cores 133-823C-56X and 133-815 B-4H). Other significant biostratigraphic datums include the disappearances of Hystrichokolpoma rigaudiae (Cores 133-823B-22X and 133-815A-5H) and Dapsilidiniumpasteilsii (Cores 133-823B-23X and 133-815A-5H) at the end of the Pliocene; the first appearance of Blysmatodinium argoi during the late Miocene (Core 133-815B-43X) and subsequent disappearance during the early Pliocene (Cores 133-823B-47X and -815B-27X); and the disappearance of Operculodinium longispinigerum (Sections 133-823A-3H-4 and -815A-1H-3) during the Pleistocene. These results are consistent with the ages determined by nannoplankton and foraminifers at these sites and also with the dinoflagellate biostratigraphy from Leg 123 (McMinn, 1992, doi:10.2973/odp.proc.sr.123.120.1992). […]
研究从大洋钻探计划（Ocean Drilling Program, ODP）815与823站位的岩芯中采获了保存完好、类型多样的甲藻囊孢（dinoflagellate cyst）组合。中中新世晚期的时代分布可依据苏门答腊甲藻属（Sumatradinium）物种的产出范围予以限定：在823站位直至岩芯133-823C-10R、815站位直至岩芯133-815B-47X的层位中均有该属物种产出。梨形蜜球甲藻（Melitasphaeridium choanophorum）首次出现于晚中新世，对应层位为823站位岩芯133-823C-19R与815站位岩芯133-815B-45X，并于晚上新世绝灭，对应层位为823站位岩芯133-823C-56X与815站位岩芯133-815B-4H。其他重要生物地层标志点包括：上新世末绝灭的里古德氏粗刺甲藻（Hystrichokolpoma rigaudiae），对应层位为823站位岩芯133-823B-22X与815站位岩芯133-815A-5H；以及帕氏达普西利甲藻（Dapsilidinium pasteilsii），同样于上新世末绝灭，对应层位为823站位岩芯133-823B-23X与815站位岩芯133-815A-5H。阿尔戈伊氏布莱斯玛甲藻（Blysmatodinium argoi）于晚中新世首次出现，对应层位为815站位岩芯133-815B-43X，并于早上新世绝灭，对应层位为823站位岩芯133-823B-47X与815站位岩芯133-815B-27X。长刺盖头甲藻（Operculodinium longispinigerum）于更新世绝灭，对应层位为823站位133-823A-3H-4与815站位133-815A-1H-3岩芯段。本次研究结果与上述站位通过超微浮游生物（nannoplankton）与有孔虫（foraminifers）测定的年代结果一致，同时也与大洋钻探第123航次的甲藻囊孢生物地层研究结果相匹配（McMinn, 1992, doi:10.2973/odp.proc.sr.123.120.1992）。[…]
