Collaborative Research: Assessing Hot Spot Fixity in the Pacific Basin

这项研究将沿着复活节/萨拉斯-y-戈麦斯/纳斯卡（ESN）轨迹进行调查，以更好地表征和约束热点在过去25至30 Ma的运动。这项调查将包括对海山和火山脊的地质年代学、地球化学和地球物理研究。多波束测深数据和后向散射图像将用于确定选定地点的地形和结构特征，并确定疏浚目标。疏浚样本将使用40Ar-39Ar技术进行年代测定，并确定其岩石学、化学和Nd-Pb-Sr同位素特征。新数据将与对现有样本的重新分析相结合，以测试纳斯卡热点运动和地幔流动模型，并将其与太平洋热点模型进行比较。

This study will conduct a survey along the Easter/Salas-y-Gomex/ Nazca (ESN) trail tobetter characterize and constrain movement of the hotspot over the last 25 to 30 Ma. The survey will involve geochronologic, geochemical, and geophysical study of seamounts and volcanic ridges. Multibeam bathymetric data and backscatter imagery will be used to define topography and structural features at selected localities and identify targets for dredging. Dredged samples will be dated using 40Ar-39Ar technique and their petrological, chemical and Nd-Pb-Sr isotopic chracteristics will be determined. The new data will be combined with re-analyses of existing samples to test Nazca-hotspot motion and mantle flow models and compare them to Pacific-hotspot models.