摘要
利用激光粒度仪对位于东海陆架济州岛西南泥质区的B2孔进行了沉积物粒度分析,根据标准偏差变化检出了B2孔含有4个粒度组分:＞65.6、65.6～10.5、10.5～1.3和＜1.3 μm,其中＞65.6μm粗组分含量很低,主要是以底栖有孔虫为主的生源沉积.各组分平均粒径和粒度含量随孔深的变化显示了65.6～10.5μm组分在B2孔含量较高(21%～30%),变化最明显,是该孔对环境变化最敏感的粒度组分.研究表明该敏感组分的粒度含量和平均粒径变化主要受东亚冬季风的强弱变化制约,其变化恢复的近2 ka来东亚冬季风变化和中国东部气候变化序列具有很好的一致性,证明65.6～10.5 μm粒度组分可以作为东亚冬季风的替代指标.
Grain-size analysis of sediment core B2, retrieved from mud area southwest off Cheju Island, East China Sea （ECS）, was carried out using a Malvern 2000 grain-size analyzer. 4 grain-size components, 〉65.6, 65.6-10. 5, 10. 5-1. 3 and 〈1.3μm, can be easily identified according to variations in the grain-size standard deviation. Mainly containing benthic foraminifera, the coarse component （〉65.6μm） has a very low content, and can be neglected. Downcore variations of the mean-size and content of the other 3 components show that the 65.6-10. 5 mm component 1 is relatively high, 21 %- 30%, and fluctuates most strongly, suggesting it is the environmentally sensitive grain-size component （ESGSC） in core B2. The mean-size and content of ESGSC in the studied mud area appears to have been mainly controlled by variations in the strength of the East Asian winter monsoon, with high content and mean-size of ESC, CS when the winter monsoon was strong. The winter monsoon variations reconstructed according to this relationship are consistent with climate series records from eastern China over the past 2 000 years, indicating that the grain-size component of 65.6- 10. 5 mm can be used as a proxy of the East Asian winter monsoon variation.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2005年第5期582-588,共7页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金项目(Nos.90211022
40206007)
中国科学院知识创新工程项目(KZCX3-SW-220).
关键词
东海泥质区
环境敏感粒度组分
东亚冬季风
气候变化
全新世
mud deposits, East China Sea
environmentally sensitive grain size component
East Asian winter monsoon
climate changes
Holocene.
作者简介
向荣（1972-），男，副研究员，博士，主要从事古海洋环境研究．E-mail：rxiang@scsio.ac.cn
