Thermal Modeling Applied to the Evolution of Contact Metamorphic Aureoles

提出了进行导热模拟的方法， 接触变质光环与计算机算法， 热演化的数值（有限差分）模拟， 入侵者。 我们将考虑的变量 这种建模包括：侵入体的形状（两个- 三维和三维建模），初始温度 侵入岩和围岩的温度，结晶潜热， 岩浆对流，热扩散系数，热膨胀系数，热膨胀系数 岩石和吸热变质反应发生在 光环 含变质岩石的接触晕 是研究这些热过程的绝佳场所 因为这些岩石中的矿物温度计 对温度场的约束。 我们的主要目标是 建议的研究是将我们的传导模型应用于 接触光环的热发展，并整合和 比较我们的结果与独立的测温的介绍- 火山岩和光环岩。 我们初步的二维 缅因州渥太华和Cupsuptic光环的传导模拟 表明我们提出的研究将产生相当大的洞察力， 侵入岩的性质和周围的热 光环 例如，我们对这些光环的建模提供了 限制晶体的百分比最初存在于 入侵者。 在湖区的斯基多光环 英格兰提供了一个极好的机会来评估接触 覆盖在侵入岩顶部的变质作用。 我们的模型 这个光环可能会为我们提供额外的重要见解 对流流体循环在热循环中的作用 侵入体上方接触带的演化。 拟议 苏格兰南部的斯特龙日晕模型 不仅提供了接触的热演化分析， 变质作用围绕着一个“蘑菇状”侵入体， 变质岩，但也提高了对Lasaga（1986）的认识。 第二硅线石的激发动力学解释 Strontian光环中的等梯度线。

It is proposed to carry out conduction thermal modeling of contact metamorphic aureoles with computer algorithms involving numerical (finite difference) simulations of the thermal evolu- tion of intrusives. Variables that we will be considered in this modeling include: shapes of intrusions (both two- dimensional and three-dimensional modeling), initial temperature of the intrusion and country rocks, latent heat of crystalliza- tion of the magma, magma convection, thermal diffusivities of the rocks, and endothermic metamorphic reactions occurring within the aureoles. Contact aureoles containing metapelitic lithologies serve as excellent locales to investigate these thermal processes because mineral thermometers in these rocks provide good constraints on the temperature field. A primary thrust of our proposed research is to apply our conduction modeling to the thermal development of contact aureoles, and to integrate and compare our results with independent thermometry of the intru- sives and aureole rocks. Our preliminary two-dimensional conduction modeling of the Ottawa and Cupsuptic aureoles in Maine shows that our proposed research will yield considerable insight into the nature of intrusives and the surrounding thermal aureoles. For example, our modeling of these aureoles provides constraints on the percentage of crystals initially present in the intrusives. The Skiddaw aureole in the Lake District of England provides an excellent opportunity to evaluate contact metamorphism overlying the roof of an intrusive. Our modeling of this aureole may provide us with additional important insight into the role of convective fluid circulation in he thermal evolution of contact aureoles above intrusives. The proposed modeling of the Strontian aureole in southern Scotland will provide not only an analysis of the thermal evolution of contact metamorphism around a "mushroom-shaped" intrusion floored by metamorphic rocks, but also improved insight into Lasaga's (1986) provocative kinetic interpretation of the second sillimanite isograd in the Strontian aureole.