Two-Stage Melting - Its Role in the Geochemical Evolution of the Sources of Ocean-Island and the Mid-Ocean Ridge Basalts

9811163Phipps Morgan在这项工作中，我们将建立地球化学演化模块，同时演化微量元素和同位素行为的地幔对流和分异的建议方案。 这些工具将模拟广泛的元素和同位素系统的地球化学演化，以便人们可以很容易地确定一个给定的方案是自我一致的，跨越广泛的地球化学约束，只有这样，稀有气体建模者才能很容易地看到，他的特定模型是不一致的Pb，Sr，或Os同位素约束地幔演化，反之亦然。 我们将把这些模块在一个基于MATLAB的图形环境，将被链接到GERM网站广泛分布在地球化学界作为研究和教学辅助。 我们还将利用这些工具来探索一系列特定情景（“两阶段熔融”）的含义，我们认为这些情景很有希望调和目前地球化学和地球物理对地壳和地幔大规模地球化学演化的限制。

9811163Phipps MorganIn this work we will build geochemical evolution modules that simultaneously evolve the trace element and isotopic behavior of proposed scenarios for mantle convection and differentiation. These tools will model the geochemical evolution of a wide spectrum of elements and isotopic systems so that one can readily determine if a given scenario is self-consistent across a broad-spectrum of geochemical constraints-only then could a rare-gas modeller readily see that his particular model is inconsistent with Pb,Sr, or Os isotopic constraints on mantle evolution, or vice versa. We will put these modules within a MATLAB-based graphical environment that will be linked to the GERM web-site for broad distribution within the geochemical community as both a research and teaching aid. These tools will also be used by us to explore the implications of a particular family of scenarios ("two-stage melting") that we feel show considerable promise to reconcile current geochemical and geophysical constraints on the large-scale geochemical evolution of the crust and mantle.