Grain-size distribution of sediments from DSDP Leg 65 Holes@en

The grain-size distribution of 223 unconsolidated sediment samples from four DSDP sites at the mouth of the Gulf of California was determined using sieve and pipette techniques. Shepard's (1954) and Inman's (1952) classification schemes were used for all samples. Most of the sediments are hemipelagic with minor turbidites of terrigenous origin. Sediment texture ranges from silty sand to silty clay. On the basis of grain-size parameters, the sediments can be divided into the following groups: (1) poorly to very poorly sorted coarse and medium sand; and (2) poorly to very poorly sorted fine to very fine sand and clay.对采自加利福尼亚湾口4个深海钻探计划（Deep Sea Drilling Project, DSDP）站位的223件未固结沉积物样品，采用筛析法与移液管法测定其粒度分布。所有样品均采用谢泼德（Shepard, 1954）与英曼（Inman, 1952）分类方案进行粒度分类。绝大多数沉积物为半远洋沉积，仅含少量陆源成因浊积岩。沉积物结构范围覆盖粉砂质砂至粉砂质黏土。基于粒度参数，可将该批沉积物划分为以下两类：（1）分选差至极差的粗砂与中砂；（2）分选差至极差的细砂、极细砂与黏土。