摘要:
用沉积物粒度分析资料推论沉积环境的双变量法中,探讨中值粒径(或平均粒径)与分选系数(或标准差)的经验关系是一个方面。目前,这方面的研究多为散点图的形式,如鲁欣(1952),弗里德曼(Friedman, G.M,1961、1968)、莫伊欧拉与韦塞(Moiola and Weiser,1968),布勒与梅曼斯的工作。本文通过对几种成因类型砂的分选系数σ与中值粒径Md的沿程变化及相互关系的分析,为推论沉积环境提供依据。
Abstract:
The size analysis of sands in the littoral area of Qinhuangdao shows that the empircal relationships between median diameter, Md, and sorting coefficient,σ, of sands different types and characteristics due to various geneses and hydrodynamic conditions.Therefore,they may be attributed to different depositional environments. A linear σ-Md graph with ascending grade suggests that the sorting of sand particles becomes better as they run way in removal and grow smaller in size, which implies a normal state of depositional differentiation.And down-sloped σ-Md line indicates that when sand particles grow smaller in transportation, their sorting becomes poorer. This means an abnormal depositional differentiation by the disturbance of wash