Fracture Zone-Hot Spot Interactions Along the Marquesas Fracture Zone

在1987年对马克萨斯岛链的一次探险中，主要调查人员绘制了位于马克萨斯隆起和马克萨斯断裂带交汇处的一座高山脊的部分地图。他们的结论是，断裂带是太平洋板块内的一个薄弱地带，允许来自薄弱热点的岩浆到达地表。该项目将使用多波束测深工具、重力、磁学、单道反射和疏浚来测量Marquas断裂带的部分。此次调查将研究三个热点地区在遇到断裂带之前、期间和之后的岩浆表现。将热点交叉处断裂区的形态与未遇到热点的其他节段进行对比。总的目标是更好地约束断裂带地形的起源、热点的固有尺寸和时间连续性、它们与岩石圈不连续的相互作用以及马克萨斯断裂带最古老部分的方位和范围。

During a 1987 expedition to the Marquesas Island chain, the principal investigators mapped part of a high ridge that lies at the intersection of the Marquesas swell with the Marquesas fracture zone. They concluded that the fracture zone is a weak zone within the Pacific plate that allowed magmas from a weak hotspot to reach the surface. This project will survey sections of the Marquesas fracture zone using multibeam bathymetric tools, gravity, magnetics, single-channel reflection, and dredging. The survey will study the magmatic expression of three hotspots before, during, and after they encounter the fracture zone. The morphology of the fracture zone at the hotspot intersections will be contrasted with other segments that have not encountered hotspots. The overall goals are to better constrain the origin of fracture zone topography, the intrinsic dimension and temporal continuity of hotspots, their interaction with lithospheric discontinuities, and the azimuth and extent of the oldest section of the Marquesas fracture zone.