渤海西部表层沉积物的地球化学记录

GEOCHMICAL RECORDS OF SURFACE SEDIMENTS IN THE WESTERN BOHAI SEA

对渤海西部表层沉积物44个样品20种化学组分进行了测试分析,研究了各化学组分分布特征及物质来源。Al_2O_3、MgO、TFe_2O_3、K_2O、Corg、TN、Li、V和Sb等组分与细粒沉积物呈正相关,SiO_2组分与粗粒沉积物呈正相关,Na_2O、CaO和Ta组分与沉积物粒度无明显正或负的相关性;研究区化学组分R-型因子分析得出3种主要组合类型,以Li、CaO和TC为代表,分别代表了陆源细粒物质输入、黄河物质、黄河物质与海河物质的影响。CaO/Al_2O_3与K_2O/Al_2O_3、Zr/Al_2O_3与CaO/Al_2O_3的离散图和Q-型聚类分析表明,渤海西部沉积物主要来源于黄河和海河,东北部沉积物受到了滦河物质的影响。

Based on the concentrations of chemical components SiO2, Al2O3, TFe2O3, CaO, MgO, Na2O, KxO,TiO2 ,P2O5, MnO, Li, V, Sb, Nb, Ta, Zr, Corg, LOI, TN and TC in surface sediment samples taken from 44 stations in the west part of the Bohai Sea, the distribution pattern and material sources of the chemical components are studied. The chemical components of Al2O3, MgO, TFe2O3, K2O, Corg, TN, Li, V and Sb are positively correlated with the fine-grained sediments, while SiO2 is positively correlated with coarse-grained sediments;there are no significant positive or negative correlations between Naz O,CaO and Ta and grain sizes of sediments. R-mode cluster analysis indicates three types of combinations that are represented by Li, CaO and TC, respectively, reflecting the input of terrigenous fine-grained material,the im- pact of the Yellow River,and the substances from both Yellow and Haihe Rivers,respectively. Combined with scatter diagrams of CaO/Al2O3 vs. K2O/Al2O3, Zr/Al2O3 vs. CaO/Al2O3, the Q-mode cluster analysis is drawn to reveal the source of sediments in the west part of the Bohai Sea. The results suggest that the sediments of the study area mainly come from the Yellow River and Haihe River,and the sediments in the northeast part of the study area are apparently influenced by the materials from the Luanhe River.