【摘要】 <正> 本文沉积物的取样范围,北起35°15′N,南至长江北口的江苏近岸浅水区（水深一般小于20米）。这里有举世瞩目的辐射状沙脊群。笔者对该区表层沉积物中的碳酸盐（以CaCO₃表示）、磷（以 P₂O₅表示）和有机质作了相关回归分析。并利用这三种化学成分的三元比率图,显示出以孢粉组合和粘土矿物类型所划三个沉积区的物质来源。更多还原

【Abstract】 Carbonates,phosphates and organic matter in surface sediments of Jiangsu nearshore were studied by regression analysis,and figures of these three chem- icals were drawn to show the source of sediments. Results indicate that the carbonates are bound up with organic matter,there is some correlation between organic matter and phosphates,and carbonates are independent of phosphates. As seen from triangular-figure of carbonates,organic matter and phosphates, in the three sedimentation areas divided according to sporopollen and the types of clay minerals,the surface sediments in north area off the ancient Huanghe River mouth and middle sand-ridges originate from ancient Huanghe River,and the surface sediments in south area between middle sand-ridges and Changjiang River mouth arise from Changjiang. The distribution pattern of surface sediment areas is in accord with hydr- ological circumstances of the north Jiansu coastal current from north to south and the north tributary current from Changjiang River in summer chiefly.It shows clearly the scope of surface sediments transported by ancient Huanghe River and Changjiang River.更多还原