【摘要】 <正> 自七十年代末八十年代初,我国开始对太平洋西部和中部进行了海底沉积物孢粉分析并取得了一些成果.1983年5月我国在中太平洋北部进行了锰结核调查,在水深4000-5500米处采集了海底沉积物样品,本文是这些样品的孢粉分析结果.共计做了十二个表层样和一个柱状岩芯的二十八个样品,柱状岩芯长3.91米,样品的分离与处理基本上采用格里丘克法进行.表层沉积物取干样100克,柱状沉积物取干样50克,镉重液比重为2.2-2.3,样品加酸处理后,又加入分散剂偏磷酸钠（NaH₂PO₄）,然后开始重液浮选离心.分析结果表明,调查区沉积物中含有孢粉,但含量不够丰富,不同类型沉积物中,孢粉含量差别较大.更多还原

【Abstract】 In this paper, The bottom sediments which were collected in the North of Mid-Pacific in May of 1983 were made pollen-spores analysis. Study Shows that the main pollen-spores composition is the gymnosperm though quantity of the pollen-spores in the investigated region is not so rich. Part of the pollen-spores may come from adjacent islands, and quite part of the pollen-spores may come from the farest continent with main composition of the pollen-spores of gymnosperm. In the marine sediments the pollen-spores composition arranges as the follows: calcareous ooze>silica-calcareous ooze>red clay. In the columnar rock sampling we can see several sections indicating marked increase in pollen-spores of gymnosperm. Those pollen-spores of gymnosperm were flatten under the 400 atmospheres during long period of more than 1000 thousand years. In the base of the columnar rook sampling we also find out the sediments, which may be ones resided before the Quaternary period.更多还原