浙江近岸海域沉积物沉积速率及地球化学

对取自浙江近岸浅海海域的5个沉积岩心进行了^210Pb放射性活度、粒度和元素地球化学含量测试，探讨了沉积速率的横向变化、化学元素的垂向分布与变化特征。结果表明，浙江近岸浅海沉积速率为1.19～0.91cm／a，存在自北向南逐渐减小的规律，并受当地入海河流的影响；元素的含量在垂向上由深到浅呈现轻微的上升趋势，呈高－低－高低或低－高低－高波动式循环变化；As、Cd、Hg、Cr、Cu、Pb和Zn等7个重点评价元素中，环境背景值普遍较高，Cr、Cu的背景值在海洋沉积物质量国家一类标准的最高限值附近。

DEPOSITION RATE AND GEOCHEMICAL CHARACTERS OF SEDIMENTS IN ZHEJIANG OFFSHORE

Based on the analysis of ^210Pb radioactivity, grain-size and element geochemical contents of 5 cores collected from shallow sea of Zhejiang offshore, we discussed the variation of deposition rates, and the vertical distribution and change characters of chemical elements. The results show that deposition rate is 1.19-0. 91 cm/a in Zhejiang offshore, with the tendency of lessening from north to south offshore, and influenced by local river. The content of element rises slightly in vertical from deep to shallow location, with a circle variation of high-low-high-low or low-high-low-high. Of seven key evaluation elements, i. e. , As, Cd, Hg, Cr, Cu, Pb,and Zn, the environment background value is high at large. The background value of Cr and Cu is close to top limited value of No. 1 grade according to standard of national marine sediment quality.