论文部分内容阅读
为研究台湾海峡西部表层沉积物磁化率变化特征及其控制因素,对采自平潭至汕尾近海海域的228个表层沉积物样品进行了磁化率分析,得出低频磁化率和频率磁化率值均呈从近岸向外海递减趋势,且厦门湾以北近岸海域的低频磁化率明显高于厦门湾以南的,频率磁化率在平潭岛外侧和汕尾近岸海域相对较高,且自平潭岛向南,有一明显的递减趋势。通过和前人关于台湾海峡西部沉积物类型和重矿物分布研究的对比发现台湾海峡西部表层沉积物磁化率在近岸细粒沉积物中高,外海粗颗粒沉积物中低,磁化率值的变化趋势和沉积物中磁铁矿含量的变化趋势一致,说明台湾海峡西部磁化率和频率磁化率主要受沉积作用和沉积物来源的影响。
In order to study the variation characteristics of magnetic susceptibility of surface sediments in western Taiwan Strait and its controlling factors, the magnetic susceptibility of 228 surface sediment samples taken from Pingtan to Shanwei coastal waters was analyzed. The results showed that both low frequency magnetic susceptibility and frequency magnetic susceptibility The trend of decreasing from nearshore to the outer sea, and the low frequency magnetic susceptibility in the offshore area north of Xiamen Bay was significantly higher than that of the south of Xiamen Bay. The frequency magnetic susceptibility was relatively high in the outer sides of Pingtan Island and Shanwei coastal waters, Lake Island south, there is a clear downward trend. Through the comparison with previous studies on sediment types and heavy minerals distribution in the western Taiwan Strait, it is found that the magnetic susceptibility of surface sediments in the western Taiwan Strait is low and the magnetic susceptibility values change in the middle and offshore sediments in the high and near-sea fine sediments. And the trend of magnetite content in sediments are consistent, indicating that the magnetic susceptibility and frequency susceptibility in the western Taiwan Strait are mainly affected by sedimentation and source of sediments.