【作者】 林凌；

【导师】 苏新；

【作者基本信息】 中国地质大学(北京) ， 海洋地质， 2012， 硕士

【摘要】 本文对IODP315航次C0002D岩芯柱样中的颗石藻进行了定量研究分析，结合结合岩芯的浮游有孔虫氧碳同位素记录、蛋白石百分含量的变化和已有的研究成果，探讨了约1Ma以来日本南海海槽黑潮下游段海洋环境的变迁，所获得的主要结果如下：获得日本南海海槽熊野盆地中更新世以来的颗石藻组合记录，共鉴定出27个种，Gephyrocapsa oceanica、Florisphaera profunda是组合的优势种。岩芯中颗石藻组合以暖水种和广温种为主，冷水种也出现过较高的峰值。岩芯中颗石藻的优势属种和其它各个属种的百分含量变化都反映出较好的冰期/间冰期旋回特征。利用浮游有孔虫氧同位素记录及U^k₃₇-SST数据估算了海水表层古盐度，并通过研究区内蛋白石含量变化获得古生产力的变化结果。IODP315-C0002D岩芯的颗石藻各属种的变化及海水表层古盐度（SSS）揭示了研究区海洋环境的复杂性，黑潮不是该区域海洋环境的唯一控制因素，上升流和北太平洋中央水团、亚北极水团也可能对研究区产生过影响。黑潮对研究区的影响主要发生在间冰期，中更新世以来研究区共经历了5次显著的黑潮影响期，分别为MIS17、MIS13、MIS6、MIS5b-MIS3初期及全新世。MIS14-8期，研究区内可能主要受亚北极水团的影响。MIS16、MIS11期，研究区可能受到北太平洋中央水团的影响；MIS19期，研究区内可能主要受沿岸流的影响。MIS10-9、MIS7初期，研究区内可能受到黑潮暖流边缘的影响。更多还原

【Abstract】 A quantitative investigation and analysis of Mid-Pleistocene to Holocenecalcareous nannofossils of Hole C0002D of IODP Exp.315from the Nankai Troughwas carried out to evaluate the variation of the coccolith assemblages in response toclimatic changes since last1Ma. The oxygen and carbon isotope composition ofplanktonic foraminifera Globigerinoides ruber, and the contents of biogenic silica,and the other research, were be used to reconstructed paleo-sea surface salinity,pale-productivity, and the evolution of the paleo-Kuroshio Current during the last1million years.Twenty-seven species of calcareous nannofossils were identified in this core, andGephyrocapsa oceanic, Florisphaera profunda are the dominant species of thecoccolith assemblages. The warm-water species and the eurythermic species are themain components of the coccolith assemblages, the cold-water species had been themain components in the evolved history. The contents of the species of the coccolithassemblages correspond well with the glacial/interglacial cycles.The coccolith assemblages and the paleo-sea surface salinity show that themarine condition in the study area was quite complex. The upwelling, the PacificCentral Water Mass and the Subarctic Mass may be important to the area in additionto the Kuroshio Current.The impact of the Kuroshio Current mainly concentrated during the interglacialperiods, the study area was under the Kuroshio domain during the periods MIS17,MIS13, MIS6, MIS5b-3and Holocene. During MIS14-8, the Subarctic Mass mayarrived this area. The marine environment was controlled by the Pacific Central WaterMass ranther than the Kuroshio over the periods MIS16and MIS11. And the Coastalcurrent was the main factor during MIS19. The Kuroshio domain may not been in thethe study area during MIS10-9and MIS7.更多还原