论文部分内容阅读
应用“向阳红 1 6号”1 992年地质调查和“向阳红 9号”1 995年地球物理调查的实际资料 ,并参照 80年代以来有关研究成果 ,对冲绳海槽沉积物类型、陆源组分的堆积形式、沉积速率、物质通量以及沉积环境状况等进行了研究。结果表明 ,冲绳海槽陆源碎屑主要集中在海底峡谷口外 ,形成海底扇沉积。海底扇以其与峡谷伴生而地势和缓、陆源组分含量高、沉积通量大、沉积物楔入体复合叠置为标志 ,揭示出海底峡谷在陆源碎屑向海槽输送过程中的通道作用 ;提出陆架潮流与海底峡谷内波、内潮汐的联合作用是陆源碎屑经峡谷通道向海槽持续搬运的主要动力因素 ,而黑潮摆动及其涡旋分支对峡谷上游沉积物的供给具有积极作用。
Based on the actual data of geo-physical survey of “Xiangyangghong No.1 6” in 1992 and the “Geophysical Survey of Xiangyanghong 9” in1995, and referring to the related research results since the 1980s, the sediment types of the Okinawa Trough, The accumulation of sedimentation rate, material flux and sedimentary environment conditions were studied. The results show that the terrestrial detritus in the Okinawa Trough mainly lies outside the mouth of the seabed gorge and forms the submarine fan deposition. The submarine fan shows its channel function in the transport of terrigenous debris to the trough by its sublation with the canyon, the high terrestrial component content, the large deposition flux, and the composite overlay of the wedges. . It is suggested that the combined action of the tidal current and the internal wave and internal tidal wave in the submarine canyon is the main driving force for the continuous transport of terrigenous clasts to the trough through the canyon channel. However, the Kuroshio swing and its vortex branch have a positive effect on the sediment supply upstream of the canyon effect.