Paleoenvironmental Implications of Grain-Size Component Variations in the Mud Area Southwest off Cheju Island, ECS
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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 < 1.3μm, 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2ka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65.6~10.5μm粒度组分可以作为东亚冬季风的替代指标.Abstract: 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 < 1.3 μm, can be easily identified according to variations in the grain-size standard deviation. Mainly containing benthic foraminifera, the coarse component (> 65.6 μm) 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 ESGCS 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.
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图 1 研究区流系和B2孔站位分布(据刘健等, 1999改绘)
阴影部分对应泥质沉积区
Fig. 1. Location of the studied core B2 and current system in the study area
图 2 B2孔粒度频率分布曲线(a) 和标准偏差随粒级的变化(b)
Fig. 2. Grain-size frequency distribution (a) and grain-size standard deviation variation (b) in core B2
图 3 B2孔3个主要粒度组分的粒度含量(a) 和平均粒径变化(b)
Fig. 3. Content (a) and mean-size variations (b) of 3 main grain-size components in core B2
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