【摘要】 冲绳海槽自中新世末以来历经了四个强烈拉张的演化过程 ,综合地球物理资料显示 ,海槽中的现代拉张作用仍在进行 ,表现在海槽轴部快速沉降形成的地堑槽 ,对称分布的张性断裂 ,晚更新世至全新世以来的岩浆活动 ,从老至新排列的磁异常条带以及高地热流、频繁的地震活动等 ,充分表明了冲绳海槽的现代扩张特点。更多还原

【Abstract】 Okinawa Trough has undergone four vehement tension evolution since the end of Miocene and has come up high stage of tension. According to the geophysical data, modern tension action is still carrying on in the trough. This could be proved through the graben trough which has been formed as rapid subsidence of the axis of Okinawa Trough, tension fault which has been formed symmetrically, magmatic evolution from late Pleistocene to Holocene, zones of magnetic anomaly arraied from old ones to new ones, frequent seism, high heat-flow, and so on. The tension characteristics of Okinawa Trough in modern times have been sufficiently proved.更多还原