Collaborative Research: Investigation of the Origin of Non-Hotspot, Intraplate, Volcanic Ridges and Cross-Grain Gravity Lineations

该项目研究位于太平洋板块上的板内火山脊（通常称为交叉纹理异常）的起源。 这些海脊的起源包括小规模的糖果卷、岩石圈石香肠和类似于起源于上地幔的小型热点的小羽流。 两个相邻的板内脊将被研究。 测量将包括对地幔结构的海底地震仪观测、地壳结构的地震折射/反射剖面图、微地震记录、对地幔熔化条件和组成的广泛的地球化学探测、火山活动时间的放射性测年、以及测深、海底侧扫反射率、沉积厚度和重力及磁力异常的绘图。

This project addresses the origin of intraplate volcanic ridges - often called cross-grain anomalies - located on the Pacific plate. Suggestions for the origin of these ridges include small-scale confection rolls, lithospheric boudinage, and small plumes resembling mini-hotspots that originate in the upper mantle. Two neighboring intraplate ridges will be studied. Measurements will include ocean-bottom seismometer observations of mantle structure, a seismic refraction/reflection profile of crustal structure, micro- earthquake recordings, extensive geochemical probing of the melting conditions and composition of the mantle, radiometric dating of the timing of volcanc activity, and mapping of bathymetry, seafloor sidescan reflectivity, sediment thickness, and gravity and magnetic anomalies.