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| 楚科奇海与白令海表层沉积中的钙质和硅质微体化石研究 | |
| 引用本文： | 陈荣华,孟翊,华棣,王汝建.楚科奇海与白令海表层沉积中的钙质和硅质微体化石研究[J].海洋地质与第四纪地质,2001,21(4):25-30. |
| 作者姓名： | 陈荣华 孟翊 华棣 王汝建 |
| 作者单位： | 1. 国家海洋局 2. 华东师范大学 3. 同济大学 |
| 基金项目： | 中国首次北极科学考察项目，华东师范大学河口海岸动力沉积和动力地貌综合国家重点实验室资助项目 |
| 摘 要： | 通过对北冰洋楚科奇海和令海41个表层沉积样品中的有孔虫、介形类等钙质微体化石和硅藻、放射虫、海绵骨针等硅质微体化石的定量分析，发现表层沉积中浮游有孔虫几乎缺失，这可能与该区表层生产力相对低、碳酸盐溶解作用较强有关，而底栖有孔虫和硅质微体化石的丰度分布则明显受表层沉积物类型、表层初级生物生产力和碳酸盐溶解作用所控制。其中，北冰洋楚科奇海陆架区有孔虫丰度和分异度低，含少量浅水介形类，放射虫在陆架浅水区缺失，但含有较多硅藻和海绵骨针等其它硅质微体化石，反映该区由于海冰、表层海水温度较冷而导致表歧初级生产力相对低。白令海陆坡区底栖有孔虫丰度比较科奇海高一个数量级，底栖有孔虫分异度也相对高，硅藻、放射虫、海绵骨针等硅质微体化石的丰度与钙质化石一样，其丰度比楚科奇海明显高，反映表层初级生产力相对高。根据白令海陆坡区底栖有孔虫和硅质微体化石丰度、底栖有孔虫胶结质壳比值的水深变化，推测该区碳酸盐溶跃层和补偿深度（CCD）相对浅，分别位于水深2000m和3800m处。 |
| 关 键 词： | 微体化石 碳酸盐溶解作用 表层沉积 北极 楚科奇海 白令海 气候变化 |
| 文章编号： | 0256-1492(2001)04-0025-06 |
| 修稿时间： | 2001年4月5日 |
CALCAREOUS AND SILICEOUS MICROORGANISMS IN SURFACE SEDIMENTS OF CHUKCHI AND BERING SEAS |
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| CHEN Rong hua ,MENG Yi ,HUA Di ,WANG Ru jian.CALCAREOUS AND SILICEOUS MICROORGANISMS IN SURFACE SEDIMENTS OF CHUKCHI AND BERING SEAS[J].Marine Geology & Quaternary Geology,2001,21(4):25-30. | |
| Authors: | CHEN Rong hua MENG Yi HUA Di WANG Ru jian |
| Institution: | CHEN Rong hua 1,MENG Yi 2,HUA Di 2,WANG Ru jian 3 |
| Abstract: | Based on the quantitative study of calcarous (foraminifera and ostracoda) and siliceous (diatom, radiolarian and sponge spicule) microorganisms in 41 surface sediment samples from the Chukchi and Bering Seas, we find that planktonic foraminifera are absent in the surface sediments, which could be attributed to the low surface productivity and strong carbonate dissolution in the study area. It has been revealed that sediment types, surface primary productivity, and carbonate dissolution mainly control the distribution of benthic foraminifera and siliceous microorganisms. The surface primary productivity is low due to the influence of sea ice and low sea surface temperture, which results in both low benthic foraminiferal abundance and diversity, radiolarian disappearing and only a few ostracoda remaining, but diatoms and sponge spicules are abundant in the surface sediments of the Chukchi Sea shelf. The surface primary productivity is much higher in the Bering Sea slope than in the Chukchi Sea shelf, benthic foraminiferal abundance in the slope is one order higher than in the shelf and diversity is also higher.Similarly, calcareous and siliceous microorganisms (diatom, radiolarian and sponge spicule) are more abundant in the Bering slope than in the Chukchi shelf. According to the abundance of benthic foraminifera and siliceous microorganisms,and the ratio of agglutinated tests in benthic foraminiferal fauna changing with the water depth, carbonate lysocline and carbonate compensation depth (CCD) are revealed at the water depths of 2 000 m and 3 800 m respectively. |
| Keywords: | microorganism carbonate dissolution surface sediments North Pole |
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