黄河三角州沿岸及相邻渤海海域碳酸盐研究(英文)

STUDY ON CARBONATES FROM THE COASTAL ZONE OF THE YELLOW RIVER DELTA AND ADJACENT BOHAI GULF

对黄河三角州陆地上河道,河口、潮间带及毗邻渤海海域沉积物中的碳酸盐含量作了分析,在此基础上划分出含量不同的沉积区和亚区。沉积区的划分和其物源有十分良好的对应关系,同一沉积区内的亚区则主要和粒度有关,从而间接反映了水动力环境与生物作用的控制性影响。黄河口沉积物中碳酸盐含量与粒度成反比,其他物源的沉积物则各不相同。黄河口及邻近渤海海域中粘土粒级和碳酸盐含量等值线反映出黄河细粒级沉积物扩散的方向、强度和范围。海洋生源沉积是影响渤海东部和中部沉积物中碳酸盐含量分布的主要因素。

Carbonate content of the sediments from the inter tidal zone and civet channels of the Yellow River Delta, and from the bottom of the Bohai Gulf adjacent to the River mouth was analyzed. Two provinces and four subprovinces were distinguished based on the carbonate content of the sediments The two provinces with different content correspond to their different source origins. The sediment from rhe Yellow River always contains higher concentration of carbonates. The four subprovinces were distinguished in the province of the Yellow River source area due to various carbonare content caused by dynamic conditions, bioactivities and sediment types.The isolines of carbonate content in the clay fraction of the sediments from the bottom of the Bohai Gulf adjacent to the Yellow River mouth show that the carbonate content decreases from the mouth to the southeast and then to the northeast, indicating the direction of movement of finegrained suspended matter of the Yellow River origin.The content nf carbonates depends upon the sediment origin, grain size and bio-agent.