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

9526723 Hanan该提案的目的是调查地幔柱和大陆玄武岩的动力学之间的联系。 地幔柱，溢流玄武岩和板内海山链之间的拟议连接意味着火山岩形成的岩石圈通过地幔柱将显示化学和同位素组成的变化，在响应羽动力学和羽和上覆岩石圈之间的相互作用。 研究人员建议通过研究爱达荷州山居和双子福尔斯之间的一条横断面上的蛇河平原沿着发现的玄武熔岩的化学性质的时空变化来研究这一过程。 将通过XRF光谱法（USC）对每个样品的主要和微量元素地球化学进行分析;将选择其中的代表性子集用于分析其他微量元素ICP-MS（百年）和放射性同位素（SDSU）。 P.I.s计划使用39 Ar/40 Ar（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。

9526723 Hanan 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.