【摘要】 研究样品由“向阳红16号”于1992年6～7月间取自冲绳海槽中部。对表层沉积物中>63μm粒级的石榴石和磁铁矿进行显微镜、扫描电镜能谱分析以及人工神经网络(B-P网络)的应用。研究表明,陆架边缘和槽坡的石榴石、磁铁矿主要来源于东海大陆架;槽底的石榴石部分来源于槽坡,部分属于海底火山或海底热液成因;槽底中北部的磁铁矿主要来源于火山活动,槽底南部的磁铁矿则可能主要来自于岛坡。更多还原

【Abstract】 The studied samples were collected from the Middle Okinawa Trough during “Xiang Yang Hong” RV cruise from June to July in 1992. The garnet and magnetite of the grade>63μm in the surface sediments of the mid Okinawa Trough were studied by microscope and Scanning Electron Microscope Energy Spectrometer (SEMES)and Artificial Neural Networks(ANN).The results show that the garnet and magnetite on the shelf edge and trough slope mainly came from the shelf of the East China Sea. Some garnet on the trough bottom came from the slope, and the rest originated from submarine volcanic or hydrothermal activity. The magnetite in the middle north of the trough bottom came chiefly from submarine volcanic activity, and the magnetite in the south of the trough bottom may be mostly came from the Ryukya island slope.更多还原