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

该项目解决了位于太平洋板块上的板内火山脊--通常被称为跨颗粒异常--的起源问题。对于这些山脊的起源提出的建议包括小规模的糖果卷，岩石圈的进食，以及类似于起源于上地幔的迷你热点的小羽流。我们将研究两个相邻的板内海脊。这些措施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，微地震记录，对地幔熔融条件和成分的广泛的地球化学探测，火山活动时间的辐射测年，以及水深测量、海底侧面扫描反射率、沉积物厚度以及重磁异常的测绘。

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.