Atterberg limits of sediments from DSDP Leg 65 Holes

Atterberg limits have been determined for 32 unconsolidated sediment samples, ranging in composition from silty clay to sandy silt and recovered from four sites drilled at the mouth of the Gulf of California during DSDP Leg 65. The liquid limit of the samples ranged from 41.5% to 157.5%, and the plastic limit from 32.8% to 65.1%. The plasticity index ranged from 5.9% to 102.0%. In some samples, the water content was less than the liquid limit. The liquidity index averaged 76% while the flow and toughness indices averaged 35% and 2.18%, respectively. On the basis of these limits, the sediments analyzed can be classified as inorganic clays of high plasticity, organic clays of moderate to high plasticity, and diatomaceous sands, silts, and silty clays of low plasticity.

本数据集针对32份未固结沉积物样品完成了阿太堡界限（Atterberg limits）测定。样品成分涵盖粉质黏土至砂质粉土区间，均采自深海钻探计划（DSDP）第65航次期间在加利福尼亚湾口钻取的4处钻探点位。样品的液限范围为41.5%至157.5%，塑限范围为32.8%至65.1%，塑性指数范围为5.9%至102.0%。部分样品的含水量低于液限。液性指数平均值为76%，流动指数与韧性指数的平均值分别为35%与2.18%。基于上述界限指标，本次分析的沉积物可划分为高塑性无机黏土、中至高塑性有机黏土，以及低塑性硅藻土砂、粉土与粉质黏土。