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| 南海西部表层沉积中的钙质超微化石 | |
| 引用本文： | 陈芳,黄永样,段威武,陆钧.南海西部表层沉积中的钙质超微化石[J].海洋地质与第四纪地质,2002,22(3):35-40. |
| 作者姓名： | 陈芳 黄永样 段威武 陆钧 |
| 作者单位： | 1. 广州海洋地质调查局实验测试所,广州,510760 2. 广州海洋地质调查局,广州,510075 3. 中国科学院,南海海洋研究所,广州,510301 |
| 摘 要： | 分析研究了南海西部308个表层沉积样品中的钙质超微化石，发现除一个样品外，所有样品均含有钙质超微化石，但相对丰度相差悬殊，在0－1725个范围内变化。钙质超微化石在平面上的分布具有较明显的分区性，可划分为3个区。超微化石组合与南海其它地区超微化石组合面貌相似，由15属23种组成，以Gephyrocapsa oceanica，G.spp.（small）,Emiliania huxleyi和Florisphaera profunda为优势种，占90％以上，其中Florisphaera profunda为绝对优势种。本调查区超微化石的分布受多种因素的综合影响，重点讨论了水深、陆源物质的稀释作用、碳酸盐的溶解作用以及重力流的沉积作用等因素对超微化石分布的影响，并根据超微化石的分布推断碳酸盐临界补偿深度（CCrD）约为3100m，碳酸盐补偿深度（CCD）大于4300m。 |
| 关 键 词： | 钙质超微化石 表层沉积 南海 丰度 陆源物质 沉积作用 重力流 |
| 文章编号： | 0256-1492(2002)03-0035-06 |
| 修稿时间： | 2002年1月10日 |
CALCAREOUS NANNOPLANKTON IN SURFACE SEDIMENTS IN THE WEST OF THE SOUTH CHINA SEA |
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| CHEN Fang ,HUANG Yong yang ,DUAN Wei wu ,LU Jun.CALCAREOUS NANNOPLANKTON IN SURFACE SEDIMENTS IN THE WEST OF THE SOUTH CHINA SEA[J].Marine Geology & Quaternary Geology,2002,22(3):35-40. | |
| Authors: | CHEN Fang HUANG Yong yang DUAN Wei wu LU Jun |
| Institution: | CHEN Fang 1,HUANG Yong yang 2,DUAN Wei wu 2,LU Jun 3 |
| Abstract: | Calcareous nannofossils analysis has been carried out for 308 surface sediment samples taken from the west of the South China Sea within a wide range of water depth from 36 to 4 245 m.The results show that the relative abundance of calcareous nannofossilis are different among the samples.The highest abundance of calcareous nannofossils is 1 725,but nannofossils are absent just in one sample. The nannofossil assemblages are composed of 15 genera and 23 species,and Gephyrocapsa oceanica, G. spp.(small), Emiliania huxleyi and Florisphaera profunda are most dominant species,and accout for 90% of the assemblage.These assemblages are similar to those in the other parts of the South China Sea.In general, nannofossil abundance decreases with water depth from continental slope to deep water basin. Nannofossil abundance is high in continental slope,lower in continental shelf and deep water basin .The factors controlling the distribution of nannofossils mainly are the dilution of terrigenous material,deep water carbonate dissolution and gravity flow.The CCrD in the west of the South China Sea is about 3 100 m,and the CCD is at least 4 245 m on the basis of nannofossil abundance and CaCO 3 content. |
| Keywords: | nannofossils surface sediments the west of the South China Sea |
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