南黄海西部陆架区SYS-0803孔上部岩心的粒度特征及其环境意义

GRAIN-SIZE DISTRIBUTION PATTERN OF THE SEDIMENTS IN THE UPPER PART OF CORE SYS-0803,WESTERN SOUTH YELLOW SEA AND ITS ENVIRONMENTAL IMPLICATIONS

对取自南黄海西部陆架区的SYS-0803孔上部的岩心样品进行了粒度分析,分离出了对沉积环境变化较敏感的粒度组分,并将粒度参数的垂向分布序列与浅地层剖面反射特征进行了对比研究。结果表明,岩心样品的粒度变化特征较好地指示了该区域古环境的演化过程,自下而上依次经历了滨浅海沉积—河流沉积—河口湾沉积—滨浅海沉积—陆架沉积等环境。

Grain-size analysis was carried out for the sediments taken from the upper part of the Core SYS- 0803 drilled in the western South Yellow Sea. The components sensitive to depositional environment are carefully studied. The vertical variation in sediment grain size, in combination with the reflection charac- teristic of seismic profiles, suggests that the sediment grain size parameters may effectively indicate the pa- leo-environment evolution. The study area has passed through a sequence of environmental changes from coastal-shallow water to fluvial deposition, to estuary deposition and to coastal - shallow water, and en- ded in an environment of continental shelf in an ascending order.