Geochemical Characteristic and Provenance Indication of Surface Sediments in Nanri Channel and Its Adjacent Sea Area,Fujian Province
The Nanri Channel in Fujian Province is an important channel for energy and material conversion between the Xinghua Bay and the Taiwan Strait. The provenance information contained in the marine sediments of Nanri channel will aid to discuss the hydrological and sedimentary characteristics of the eastern China Sea. This work analyzed the grain size and parameters,major and trace elements,and rare earth elements of the surface sediments from the Nanri channel and its adjacent Xinghua Bay. Results show that the sediments in Nanri channel are mainly composed of sandy silt,with fine-grained clayey silt in the shallow part of the offshore area. The hydrodynamic condition is generally moderate,which is weaker in the offshore area than that in the inshore area horizonally. In contrast,the sediment grain size in Xinghua Bay becomes coarser with depth,and the hydrodynamic condition is gradually strengthened from shallow to deep,which is generally weaker than that in Nanri Channel. The major and trace elements of the surface sediments in the study area were analyzed by R-factor method. The sediments in Nanri Channel were controlled by coarse clastic components (such as quartz,bioclasts,etc.),fine-grained terrigenous clastic minerals,hydrodynamic conditions and marine chemical sedimentation,while the sediments in Xinghua Bay were mainly affected by terrigenous clastic sedimentation and marine biological sedimentation. The REE distribution pattern and the provenance discrimination diagram show that the provenance of the Nanri channel is similar to that of the Xinghua Bay,which is mainly controlled by the materials from the Zhejiang-Fujian River and the Yangtze River carried by the Zhejiang-Fujian Coastal Current.
marine sedimentgeochemistryprovenanceNanri channelXinghua BayFujian Province
万方数据
维普
