Environmentally Sensitive Grain-Size Extraction of Deep Hole Sediment from Tianjin Coastal Plain and Its Significance
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摘要: 沉积物环境敏感粒度是进行古环境研究的重要方法之一, 然而华北平原地区很少进行完整的第四纪全取心深孔沉积物环境敏感粒度组分的提取及分析.对天津渤海湾G1和G2孔第四纪沉积物样品进行粒度分析, 采用粒级-标准偏差和主成分分析两种方法进行了沉积物环境敏感粒度组分提取.对比提取结果发现, 两种方法存在差异性的同时还存在一定的兼容性, 沉积层理厚度越薄, 兼容性越明显; 主成分分析方法对沉积物环境敏感粒度组分刻画得更为细致, 粒级-标准偏差方法不适合深孔沉积物整体敏感粒度组分的提取.G1孔环境敏感粒度组分的粒度峰值为6.700μm、15.650μm、36.240μm、176.900μm、282.100μm、716.800μm; G2孔环境敏感粒度组分的粒度峰值为0.578μm、176.000μm, 分别对应6个和3个粒度分布区间, 指示两孔整体上的沉积物来源及沉积环境空间存在差别.G2孔相对于G1孔整体上的沉积强度大且沉积环境较为稳定, 适合于开展高分辨率的古环境重建工作.Abstract: Sediment environment sensitive granularity is one of the important methods of the ancient environment study, but there are very few complete quaternary sediment core deep hole to extract environmentally sensitive granularity component and analysis in the north China plain regions. Grain size versus standard deviation, and principal component analyses have been applied to extract sensitive grain size components from sediment samples of G1 and G2 in Tianjin Bohai bay. Comparison of extraction results of the two methods shows both differences and compatibility. The thinner the thickness of sediment bedding is, the more obvious the compatibility is. It is found that principal component analyses can provide better description while grain size versus standard deviation is not suitable for the deep hole extraction. Six and three environmentally sensitive granularity component peaks appear in G1 and G2 holes, which are 6.70μm, 15.65μm, 36.24μm, 176.90μm, 282.10μm, 716.80μm for G1, 0.578μm and 176.000μm for G2 respectively, indicating different sediment sources and sedimentary spatial environment for G1 and G2. Compared with G1 hole, the sedimentary environment of G2 is more stable with stronger deposit strength, which can be used to reconstruct the palaeoenvironment.
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图 1 研究区位置及钻孔G1和G2分布
Fig. 1. Position of the study area and distribution of the drill holes G1 and G2
图 2 G1(a)和G2(b)粒级-标准偏差曲线
Fig. 2. The grain size versus standard deviation curves of G1 (a) and G2 (b)
图 5 G1孔(a)和G2孔(b)不同深度样品的频率分布曲线
Fig. 5. The bore frequency distribution curves of the samples from different depth of G1 (a) and G2 (b)
图 6 G1孔(a)和G2孔(b)平均粒径分布
Fig. 6. The average particle size distribution of G1 (a) and G2 (b)
图 8 G1孔沉积物敏感粒级相关性分析
Fig. 8. The sensitive graded sediment correlation analysis of G1 hole
图 9 G2孔增大采样间隔后的粒级-标准偏差曲线
Fig. 9. The standard deviation curve of G2 after increasing the sampling interval
表 1 G1孔沉积物粒度主成分分析结果
Table 1. The sediment granularity principal component analysis results of G1 hole
公因子 F1 F2 F3 F4 F5 特征值 69.318 12.191 7.575 6.904 5.191 贡献率占总方差(%) 59.757 10.509 6.530 5.952 4.475 累积贡献率(%) 59.757 70.266 76.796 82.748 87.223 
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表 2 G2孔沉积物粒度主成分分析结果
Table 2. The sediment granularity principal component analysis results of G2 hole
公因子 F1 F2 F3 F4 特征值 26.180 8.420 5.020 2.790 贡献率占总方差(%) 54.571 17.543 10.465 5.816 累积贡献率(%) 54.571 72.083 82.548 88.384
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表 3 G1和G2钻孔沉积物敏感粒度组分
Table 3. The drilling sensitive sediment particle size compositions of G1 and G2
公因子 F1 F2 F3 F4 F5 因子构成(μm) G1 0.112~18.860 101.100~213.200 0.040~0.195 8.943~12.990 18.860~47.940 43.670~92.090 176.900~234.000 282.100~541.900 G2 0.289~15.550 104.600~209.300 11.000~62.220 114.600~176.000 248.900~497.800 44.000~87.990 176.000~209.300
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表 4 主成分分析提取的敏感粒度组分
Table 4. Sensitive grain size component of the principal component analysis
公因子 F1 F2 F3 因子构成(μm) 0.289~22.000 73.990~296.000 18.500~73.990 148.000~418.600 73.990~124.400
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