Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| 南海北部神狐海域晚末次冰期以来有孔虫特征及其对古海洋环境的指示 | |
| Alternative Title | CHARACTERISTICS OF FORAMINIFERAL ASSEMBLAGES SINCE LAST GLACIAL FROM SHENHU AREA OF NORTHERN SOUTH CHINA SEA AND IMPLICATIONS FOR PALEOCEANOGRAPHIC ENVIRONMENTAL CHANGES |
潘梦迪1,2,5; 邬黛黛2 ; 吴能友3,4,6; 刘丽华1,5
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| 2017-04 | |
| Source Publication | 海洋地质与第四纪地质
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| ISSN | 0256-1492 |
| Volume | 37Issue:2Pages:127-138 |
| Abstract | 南海北部陆坡有大量高分辨率沉积记录,对研究全球变化响应及驱动机制有着举足轻重的作用。本研究选取南海北部神狐海域2007年水合物钻探区Site 6A站位柱状沉积物,开展有孔虫群落、稳定同位素及AMS14 C分析研究,试图了解该区域晚末次冰期以来古海洋和古气候演化历史。结果显示,Site 6A站位柱状沉积物中底栖有孔虫连续分布,优势属种突出,丰度、分异度波动明显。沉积物底界为MIS3期约50kaBP,全新世沉积速率最高,为13.37cm/ka,在MIS2期可能存在由水合物分解导致的地层缺失。有孔虫氧碳同位素特征恢复了冰期/间冰期气候旋回变化及冰盖体积变化,也指示该海域沉积环境氧化还原状况基本不变。通过对具有特殊生态意义的底栖有孔虫Uvigerina、Cibicidoides、Bulimina的相对丰度分析,结合似瓷质壳体百分含量及浮游有孔虫碳同位素,得出在末次冰期40kaBP东亚夏季风增强带来大量降雨,陆径流量增大导致古生产力增加。12~17ka的古生产力高值可能与增强的冬季风携带大量陆源碎屑沉积有关,并使得北大西洋低温、低氧、高营养盐的水团对该站位影响更大。 |
| Other Abstract | The northern slope of South China Sea(SCS),as the area rich in high-resolution depositional records,is critical to the study of regional response and driving mechanism of global change in the South China Sea.For a better understanding of the evolution of the paleoclimate and paleoenvironment since the late last glacial period in SCS,foraminiferal records at Site 6Afrom the Shenhu hydrate drilling area 2007 on the northern slope are selected as the target to study the foraminifera assemblages with the support of stable isotopes and AMS14 C dating data.Information on sedimentary events since MIS3 of the last 50 000 years has been recorded in the core,and the highest Holocene sedimentation rate is as high as 13.37cm/ka.In MIS2,there may be lack of deposition due to decomposition of gas hydrate.Benthic foraminifera are present throughout the core.It is easy to distinguish dominant species.The abundance as well as the diversity of the assemblage fluctuates significantly with time.Two stages of high surface productivity in about 40 kaBP and 12~17kaBP respectively are identified through the analysis of some species with specific ecological significance,such as Uvigerina,Bulimina,Cibicidoidesat,combined with the proportion of porcellaneous shells and variations in planktonic foraminiferal carbon isotopes.The strengthening of summer monsoon in 40 ka was supposed to have brought in a large amount of rainfall,and thus increased the land surface runoff and paleo-productivity.The increase in terrigenous input contributed to the high paleo-productivity 12~17ka.Furthermore,the North Pacific Deep Water with low temperature,low oxygen content and high nutrient content,may render stronger influence on the core as the winter monsoon enhanced. |
| Keyword | 有孔虫组合 稳定同位素 古生产力 气候变化 神狐海域 foraminiferal assemblages stable isotopes paleo-productivity paleo-environmental changes Shenhu Area |
| DOI | 10.16562/j.cnki.0256-1492.2017.02.013 |
| Language | 中文 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/16638 |
| Collection | 中国科学院广州能源研究所 |
| Corresponding Author | 邬黛黛 |
| Affiliation | 1.中国科学院天然气水合物重点实验室，广州510640; 2.中国科学院大学，北京100049; 3.国土资源部天然气水合物重点实验室，广州510640; 4.海洋国家实验室海洋矿产资源评价与探测技术功能实验室，青岛266071; 5.中国科学院广州能源研究所，广州510640; 6.中国科学院广州能源研究所，广州510640 |
| First Author Affilication | 天然气水合物; GuangZhou Institute of Energy Conversion,Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | 潘梦迪,邬黛黛,吴能友,等. 南海北部神狐海域晚末次冰期以来有孔虫特征及其对古海洋环境的指示[J]. 海洋地质与第四纪地质,2017,37(2):127-138. |
| APA | 潘梦迪,邬黛黛,吴能友,&刘丽华.(2017).南海北部神狐海域晚末次冰期以来有孔虫特征及其对古海洋环境的指示.海洋地质与第四纪地质,37(2),127-138. |
| MLA | 潘梦迪,et al."南海北部神狐海域晚末次冰期以来有孔虫特征及其对古海洋环境的指示".海洋地质与第四纪地质 37.2(2017):127-138. |
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