Geochemical characteristics and their geological implication in sediments from Laizhou Bay since late Quaternary
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摘要:
元素地球化学信息对于地层划分和物源分析具有重要的指示意义。通过分析莱州湾BH1302孔岩芯沉积物常微量元素特征发现，元素含量在地层分界处发生明显变化，可以作为晚第四纪地层划分的重要指标。结合钻孔岩性相、粒度特征和测年数据，将研究区晚第四纪以来的沉积划分为4段，分别对应于晚中更新世、MIS 5期、MIS 4—3期和MIS 1期。钻孔岩芯沉积物常微量元素在垂向上变化存在着共生的关系，除Na2O、Ba和Sr外，大部分常微量元素变化与粒径强相关。R型因子分析揭示陆源细颗粒碎屑沉积、陆源粗颗粒碎屑沉积和海洋自生元素供应对BH1302孔沉积物的地球化学组成具有重要作用，但不同时期影响作用有所差异，陆源细颗粒碎屑沉积占主导地位，但短时期内陆源粗颗粒碎屑沉积或海洋自生元素供应也可能成为主导因素。
Abstract:Element geochemical information is important for stratigraphic division and provenance analysis. The characteristics of major and trace elements in the sediments of core BH1302 in Laizhou Bay are analyzed, whose concentrations change obviously at the stratigraphic boundary and can be used as an important index for the classification of late Quaternary strata. Combined with the lithologic facies, grain size and dates of core BH1302, the sediments in the study area since the late Quaternary can be divided into four phases, which corresponding to late Middle Pleistocene, MIS 5, MIS 4—3 and MIS 1, respectively. In vertical, the changes of major and trace elements of the core are characterized by a symbiotic relationship. Except for Na2O、Ba and Sr, most of the major and trace elements are strongly correlated with the mean particle size in the vertical distribution. R-type factor analysis revealed that the supply of terrigenous fine and coarse particulate and marine authigenic elements had important effects on the geochemical composition, but the effects are different in different periods. Terrigenous fine particulate supply is the dominant factor, but terrigenous coarse particulate supply or marine authigenic elements supply may also be the dominant factor in a short period.
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Key words:
- geochemical /
- R-type factor analysis /
- late Quaternary /
- Laizhou Bay
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表 1 BH-1302孔AMS14C测年结果
Table 1. AMS14C dating results of core BH1302
深度/m 材料 δ13C
/‰14C年龄/a 日历年龄（cal.aBP） 中值 范围（2σ） 4.38 螺 −3.2 6 530 ± 40 7 233 7 166～7 299 14.38 螺 −8.3 ＞43 500 — — 18.23 螺 −6.1 ＞43 500 — — 47.46 螺 +1.1 ＞43 500 — — 
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表 2 BH1302孔沉积物样品光释光测年结果
Table 2. Optically stimulated luminescence dating results for sediment samples of core BH1302
样品编号 深度/m 含水率ω /% U/10-6 Th/10-6 K/% 等效剂量/Gy 年龄/ka OSL-1 9.22 10.22 2.25 9.14 1.98 91.46 33.1±2.3 OSL-2 11.15 17.22 2.55 10.43 2.02 126.05 43.0±1.9 OSL-3 13.45 12.52 2.15 7.36 1.56 133.43 59.0±3.9 OSL-4 19.90 14.76 2.21 6.05 1.75 138.29 66.7±3.2 OSL-5 22.46 11.19 1.85 6.11 2.20 185.70 68.5±5.5 OSL-6 25.22 12.26 1.99 6.22 2.19 190.48 71.3±3.4 OSL-7 30.25 14.47 1.84 7.35 2.10 201.66 76.4±3.5 OSL-8 33.05 25.65 2.22 8.85 2.28 222.76 80.1±7.3 OSL-9 36.00 10.51 1.98 7.31 1.99 259.86 102.3±5.0
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表 3 BH1302孔沉积物常微量元素统计表
Table 3. Statistics of major and trace elements in the sediments of core BH1302
平均值 最大值 最小值 标准偏差 变异系数 主量元素
/%SiO2 57.65 77.26 40.76 7.91 0.14 Al2O3 10.96 16.03 8.06 1.82 0.17 CaO 4.27 11.37 0.62 2.07 0.48 MgO 1.79 2.66 0.28 0.56 0.31 K2O 2.44 3.64 1.94 0.29 0.12 Na2O 2.41 7.78 1.82 0.61 0.25 TiO2 0.56 0.79 0.09 0.14 0.24 P2O5 0.12 0.17 0.05 0.03 0.23 MnO 0.06 0.19 0.02 0.02 0.43 TFe2O3 3.68 6.58 0.94 1.32 0.36 微量元素/(μg/g) Ba 549.11 1 499.00 396.00 155.54 0.28 Sr 232.24 452.00 160.00 47.69 0.21 Rb 93.40 136.00 68.50 15.07 0.16 V 64.66 119.00 11.90 23.20 0.36 Cr 57.52 95.20 8.90 17.32 0.30 Zn 57.32 102.00 14.80 20.36 0.36 Ni 24.43 46.20 3.70 10.07 0.41 Pb 20.38 35.50 13.00 4.78 0.23 Cu 19.48 62.50 1.00 10.62 0.55 Ga 14.40 23.10 9.50 3.15 0.22 Co 10.24 25.00 1.83 4.00 0.39 Th 10.01 16.60 2.23 3.01 0.30 Sc 9.51 16.90 1.14 3.37 0.35 As 8.78 23.00 2.49 3.81 0.43
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表 4 BH1302孔沉积物主微量元素方差极大旋转因子载荷表
Table 4. Load table of maximum variance rotation factor of major and trace elements in the sediments of core BH1302
元素 因子1 因子2 因子3 元素 因子1 因子2 因子3 砂 −0.736 −0.479 −0.349 Co 0.882 0.23 0.248 粉砂 0.645 0.574 0.31 Sc 0.887 0.356 0.267 黏土 0.812 0.148 0.374 Ga 0.977 0.092 0.125 Al2O3 0.975 0.105 0.005 Th 0.852 0.403 0.209 MgO 0.728 0.415 0.486 Mz 0.807 0.37 0.359 TiO2 0.741 0.612 0.126 As 0.551 0.042 0.366 Fe2O3 0.915 0.247 0.24 K2O 0.299 −0.847 −0.208 Rb 0.945 −0.156 0.108 Sr −0.565 −0.692 0.203 V 0.903 0.305 0.259 Ba −0.191 −0.818 −0.203 Cu 0.866 0.03 0.327 CaO −0.076 0.229 0.934 Pb 0.825 −0.164 0.103 MnO 0.317 0.02 0.713 Zn 0.89 0.248 0.344 P2O5 0.356 0.495 0.546 Cr 0.87 0.43 0.168 SiO2 −0.531 −0.265 −0.746 Ni 0.907 0.262 0.267 方差贡献率/% 67.017 10.602 6.665
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