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放射虫是揭示古海洋环境信息的重要载体。本文采用虎红染色方法,首次揭示了南海典型断面现代放射虫残骸群的空间分布特征,并比较分析现代水体中放射虫残骸群与海底表层沉积物中放射虫化石群的相互关系。结果表明:南海春季放射虫残骸群比较丰富,其丰度一般呈现出随深度增加而增高的趋势,最高值主要出现在75—300m深即位于叶绿素最大值层和活体高峰深度之下;分析发现研究区放射虫残骸丰度的深度分布受到海流的横向输运影响;春季水体和表层沉积物中放射虫属种组成和丰度分布的差异表明,除了现代放射虫具有季节性变化之外,海流的横向传输也是一个很重要的原因。在150—300m水体中除了Cornutella profunda和Cyrtopera laguncula,还发现了Cycladophora davisiana的残骸,推测典型冷水种C.davisiana由于受到径向翻转流的作用,从中深层水被带到了中上层水体中。
Radioactive larvae are the important carriers for revealing the ancient marine environment information. In this paper, the spatial distribution of the modern radioactive insect debris group in the typical section of the South China Sea was revealed for the first time by the method of tiger red staining. The correlation between the radioactive fossils in the surface sediment and the radioactive debris group in modern water bodies was comparatively analyzed. The results showed that the abundance of spring radiolarian debris in the South China Sea was relatively abundant, and its abundance tended to increase with increasing depth. The highest value appeared mainly in the depth of 75-300 m, ie, below the maximum chlorophyll and living depth. The depth distribution of radiolarian debris abundance in the study area was affected by the lateral transport of ocean currents. The differences in the composition and abundance distribution of radiolarians in spring water bodies and surface sediments showed that, in addition to the seasonal changes of modern radiolarians, The horizontal transfer is also a very important reason. The remains of Cycladophora davisiana were also found in addition to Cornutella profunda and Cyrtopera laguncula in 150-300 m of water, suggesting that C. davisiana, a typical cold-water species, was brought from the mid-deep water into the upper and middle waters due to the radial tipping flow.