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PLATE BOUNDARY REORGANIZATION AT A LARGE-OFFSET, RAPIDLY PROPAGATING RIFT

机译:大偏移,快速传播的板边界重组

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THE existence of rapidly spinning microplates along the southern East Pacific Rise has been documented by geophysical swath-mapping surveys(1-6), and their evolution has been successfully described by an edge-driven kinematic model(7). But the mechanism by which such microplates originate remains unknown. Proposed mechanisms(1-10) have generally involved rift propagation(11), possibly driven by hotspots or changes in direction of sea-floor spreading. Here we present geophysical data collected over the Earth's fastest spreading centre, the Pacific-Nazca ridge between the Easter and Juan Fernandez microplates (Fig. 1), which reveal a large-offset propagating rift presently reorganizing the plate boundary geometry. A recent episode of rapid 'duelling' propagation of the historically failing spreading centre in this system has created a 120 x 120 km overlap zone between dual active spreading centres, which may be the initial stage of formation of a new microplate. [References: 32]
机译:地球物理测绘图谱(1-6)记录了东南太平洋上升沿南部快速旋转的微板的存在,并通过边缘驱动的运动学模型成功地描述了它们的演化(7)。但是,这种微孔板产生的机理仍然未知。拟议的机制(1-10)通常涉及裂谷传播(11),可能是由热点或海底扩展方向的变化驱动的。在这里,我们介绍了在地球上扩散最快的中心,复活节和胡安·费尔南德斯微板之间的太平洋纳斯卡海脊(图1)收集的地球物理数据,这些数据揭示了目前正在重组板块边界几何形状的大偏移传播裂缝。在这个系统中,历史上已经失败的扩散中心迅速地“消除尘土”扩散,最近形成了一个双重活跃扩散中心之间120 x 120 km的重叠区域,这可能是形成新的微孔板的初始阶段。 [参考:32]

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