浙江海岸带石英砂表面微形貌结构的初步研究

作者对浙江海岸带石英砂所做的电镜分析表明,在不同的沉积环境中石英砂的磨圆程度和表面形态各不相同。河流石英砂磨圆最差,近岸浅海石英砂磨圆程度较潮间带差。本区石英砂表面形态主要有7种:1.贝壳状断口,2.溶蚀孔,3.不规则断块,4.V形痕,5.碟形痕,6.表面弯曲沟,7.硅质沉淀。其中以贝壳状断口、不规则断块、溶蚀孔、硅质沉淀等形态为主。本文还指出了研究石英砂表面形态的意义。

A preliminary study on surface microstructure of quartz sand from Zhejiang coast zone

By analyzing the electron microphotographes of quartz sand from the Zhejiang coast zone, it is known that the rounded degree and microstructure of the quartz sand is distinct in different sedimentary environments. The roundness of river quartz sand is the worst, which may be related to the closer source. The rounded degree of quartz sand in shallow waters is worse than that in the tidal zone, which is associated with hydrodynamic effect during long period. There are seven kinds of microstructure of quartz sand in this area: (1) Conchoidal fractures, (2) Solution holes, (3) Irregular fractures, (4) V-shaped marks, (5) Plate-marks, (6) Surface curved grooves, and (7) Siliceous coating. Of them conchoidal fractures, solution holes, irregular fractures and siliceous coating are more prominent in the Zhejiang coast zone. Finally, the importance of studying quartz microstructure is indicated.