TECTONIC CHARACTERISTICS AND EVOLUTION OF THE NORTH FIJI BASIN
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摘要: 北斐济海盆位于西南太平洋边缘,近半个世纪以来,针对该海盆地质和地球物理特征的调查研究取得了丰硕的成果。现今海盆内活动的构造带主要包括北斐济断裂带以及北部、中部、斐济西侧3组扩张中心,北斐济断裂带以左行走滑作用为主,扩张中心具有不稳定性。北斐济海盆形成于约10 Ma,早期主要受控于瓦努阿图岛弧的顺时针旋转,后期在以近NS和EW向的扩张作用控制下逐渐张开。扩张中心的迁移和多期构造运动的叠加是造成现今海盆内复杂构造和磁异常特征的主要原因。北斐济海盆扩张活动的深部动力学机制仍需进一步研究。Abstract: The North Fiji Basin is a matured marginal basin located at the southwest border of the Pacific. Geological and geophysical characteristics of the basin are well studied through surveys and researches during the past half century. The modern active tectonic belts mainly including the sinistral North Fiji Fracture Zone and the three groups of spreading centres remain instable. The North Fiji Basin formed during the past 10 Ma was mainly controlled by the clockwise rotation of the Vanuatu Arc in early stage,and the NS and EW direction spreading in late stage. The complex structural and magnetic textures observed in the basin are the results of the migration of spreading centres and the superposition of multiphase tectonic movements. Further studies and discussions should be made on the deep geodynamic mechanisms of the spreading activities of the basin.
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Key words:
- fracture zone /
- spreading centre /
- tectonic evolution /
- North Fiji Basin
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