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

在这项工作中，我们将构建地球化学演化模块，同时演化地幔对流和分化的痕量元素和同位素行为。这些工具将对广泛的元素和同位素系统的地球化学演化进行建模，这样人们就可以很容易地确定一个给定的情景是否在广泛的地球化学约束条件下是自一致的——只有这样，一个稀有气体建模者才能很容易地看到他的特定模型与地幔演化的Pb、Sr或Os同位素约束条件不一致，反之亦然。我们将把这些模块放在基于matlab的图形环境中，该环境将链接到地球化学研究中心的网站，以便在地球化学界广泛分发，作为研究和教学的辅助工具。我们还将使用这些工具来探索一类特殊情景（“两阶段融化”）的含义，我们认为这些情景显示出相当大的希望，可以调和当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.