粤西水东近岸沉积的重矿物特征及其环境意义

Heavy Mineral Characteristics in Near-shore Sediment of Shuidong of West Guangdong and Significance of Their Environments

粵西水东湾为一典型的砂坝泻湖式海岸。在其近岸沉积中,业经鉴定的重矿物共有27种(类),它们分别构成各具特色的4个不同的组合类型。其中海相矿物含量从海向陆由高到低的变化趋势,以及不稳定矿物/稳定矿物含量的呈逆相关的变化,提供了泥沙由海向陆搬运的矿物学方面的证据;矿物集合体为反映滨海环境的一个特征性的矿物成分;4个重矿物组合类型分别显示出水东砂坝泻湖海岸体系不同的动力沉积环境的特点。

Shuidong gulf of west Guangdong is a typical coast of the Barrier a Lagoon.There are twenty seven kinds of heavy mineral identified in near-shore sediment,four different combinations are constructed.Contents of the seamineral of them have a changing trend from higher to lower a range from sea to land,and the ra-tio of content of unstable mineral to stable mineral is an opposed changing cha-racteristic,they lprovide the proof that minerals carried from sea to land.The mineralagical collective is a characteristic mineral reflecting the seashore environment.Four heavy mineral combinations show respectively the different characteristics of hydraulic-sediment environment of Barrier-Lagoon system in Shuidong.