岩石或矿物颗粒在搬运过程中经冲刷，滚动，撞击，棱角被磨圆的程度。磨圆度可反映碎屑生成的环境和搬运距离，一般来说，碎屑搬运距离越长，或经过反复搬运（如风成碎屑，海滨碎屑），其圆度越高。重力崩塌或冰川形成的碎屑，其圆度甚差。
n. roundness ; psephicity
砾岩主要砾石成分为燧石，磨圆度较好，普遍含金刚石。
Chert with good abrasion the major content in conglomerate and diamonds are contained in it generally.
砾岩主要砾石成分为燧石，磨圆度较好，普遍含金刚石。
Chert with good abrasion is the major content in conglomerate, and diamonds are contained in it generally.
上述阶地、沙嘴和湖岸堤的沉积物主要由磨圆度和分选性较好的砂或砂砾石组成。
The land spit and lake terrace are formed by the sand and grit which have good polish and select.
应用推荐