Collaborative Research: RUI: Plume Tails and Continental Lithosphere: A Petrologic Transect of the Snake River Plain Between Mountain Home and Twin Falls, Idaho

[9526722] Vetter本提案的目的是研究地幔柱动力学与大陆玄武岩之间的联系。地幔柱、洪水玄武岩和板块内海山链之间的联系表明，由岩石圈穿过地幔柱形成的火山岩的化学和同位素组成将根据地幔柱动力学和地幔柱与上覆岩石圈之间的相互作用而变化。私家侦探们建议通过检查在斯内克河平原上发现的玄武岩熔岩的化学成分的时空变化来研究这一过程，这些玄武岩熔岩位于爱达荷州Home山和Twin Falls之间的横断面上。选定的样品将通过XRF光谱（USC）分析主要和微量元素的地球化学特征；其中一个代表性的子集将被选择用于分析额外的微量元素ICP-MS （Centenary）和放射性同位素（SDSU）。P.I.s计划用39Ar/40Ar（伯克利地质年代学实验室）测定14个熔岩流的年代。这些数据将使我们能够评估玄武岩地幔源区的变化，并确定岩石圈和地壳同化的影响。

9526722 Vetter The object of this proposal is to investigate connections between the dynamics of mantle plumes and continental basalts. The proposed connection between mantle plumes, flood basalts, and intraplate seamount chains implies that volcanic rocks which form by passage of lithosphere over a mantle plume will display chemical and isotopic compositions which vary in response to plume dynamics and interactions between the plume and the overlying lithosphere. The P.I.s propose to investigate this process by examining spatial and temporal variations in the chemistry of basaltic lavas found in the Snake River Plain along a transect between Mountain Home and Twin Falls, Idaho. Selected samples from each will be analyzed for major and trace element geochemistry by XRF spectrometry (USC); a representative subset of these will be chosen for analysis of additional trace elements ICP-MS (Centenary),and radiogenic isotopes (SDSU). The P.I.s plan to date 14 lava flows using 39Ar/40Ar (Berkeley Geochronology Laboratory). These data will allow us to assess changes in the mantle source regions of the basalts, and to identify the effects of lithospheric and crustal assimilation.