Collaborative Research: Mantle Plume Dynamics and Noble Gas Isotope Systematics along the Mid-Atlantic Ridge

小行星9302313 这一提议是罗切斯特大学和罗得岛大学之间的合作研究成果，目的是利用多种同位素示踪剂来研究热浮力地幔柱与大西洋中脊（79 N-6 S）的贫化软流圈相互作用时的释气动力学。这项建议将侧重于稀有气体（He、Ne、Ar、Ar）的同位素分析和元素母/子体浓度（Rb/Sr、Sm/Nd、U/Pb、Th/Pb和Cl）。在手工挑选的MORB玻璃上，将建立从Sr、Nd、Pb到He、Ne、Ar、H2O和Cl等各种挥发性元素的完整的多同位素和浓度数据集。通过结合地球物理资料和挥发性和亲石同位素测量，本研究将试图约束地幔柱的放气行为，地幔非均匀性的性质，尺度长度和混合特征，以及地幔柱-软流圈混合动力学。调查的四个地区是：赤道大西洋、扬马延-莫恩斯-莫希波维奇海脊、冰岛-雷克雅未克-科尔拜因塞海脊和亚速尔-大西洋中部海脊。每个区域都有独特的地球化学和构造特征，这将为地幔演化和地幔柱动力学提供深入了解。

9302313 Schilling This proposal is a collaborative research effort between the University of Rochester and the University of Rhode Island to use multiple isotopic tracers to investigate the dynamics of outgassing when thermally buoyant mantle plumes interact with the depleted asthenosphere along the Mid-Atlantic Ridge (79 N -6 S). This proposal will focus on the isotopic analyses of the noble gases (He, Ne, Ar, Xe) and on the elemental parent/daughter concentrations (Rb/Sr, Sm/Nd, U/Pb, Th/Pb and Cl). On hand-picked MORB glass, a complete multi-isotope and concentration data set will be established for elements of varying volatilities, ranging from Sr, Nd,Pb to He,Ne, Ar, Xe and Cl. By combining both volatile and lithophile isotope measurements with geophysical data, this research will attempt to constrain the outgassing behavior of mantle plumes, the nature, scale length and mixing characteristics of mantle heterogeneities and the dynamics of plume-asthenosphere mixing. The four provinces of investigation are: the Equatorial Atlantic, the Jan Mayen-Mohns-Knipovich Ridge, the Iceland-Reykjanes-Kolbeinsey Ridge and the Azores-Mid Atlantic Ridge . Each region has unique geochemical and tectonic characteristics that will provide insights into mantle evolution and plume dynamics.