两种碎屑沉积物分类的比较

近二十年来我国海洋地质工作者采用１９７５年国家海洋局制定的海洋调查规范中碎屑沉积物粒度分类。即将由国家技术监督局发而的布的新的海洋调查规范规定采用谢帕德分类。这两种类都是属于三我图解分类法。然而，两种分类中各自采用的砂－粉砂－粘土比例标准不同。在三角图中命名有差异的区域占８．２５％。比较而言，１９７５年调查规范分类中第二高含量粒度的百分比具有较重意义。

COMPARISON OF TWO CLASSIFICATIONS OF CLASTIC SEDIMENTS

The classification of clastic sediments in the specifications for oceanographic survey issued by State Oceanic Administration of China in 1975,was widely accepted by Chinese marine geologists,and now Shepard's classification of clastic sediments is adopted in new specifications for oceanographic survey issued by State Technologic Supervisory Administration of China,Sand-silt-clav ratios in the two classifications are different. Nomenclature difference in the triangular composition diagram is 8.25%in area,Com- paratively speaking,the percentage of the second highest content of granulometric com- position plays an important role in the classification issued in 1975.