Re-equilibration processes in grain-internal domains: The interrelation of mineral reactions and deformation during metamorphism (TP14)

颗粒内部区域的再平衡过程：变质过程中矿物反应和变形的相互关系（TP14）

• 批准号: 169248315
• 负责人: Dr. Gerlinde Habler
• 金额: --
• 依托单位: Institut für Geologie
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/169248315?language=en
• 关键词: Re; equilibration; processes; grain; internal

Stranded reactions in grain interiors are used to study the parameters controlling re-equilibration processes in metamorphic rocks. We focus on mineral host/inclusion arrangements, which were affected by re-equilibration under changing ambient conditions (P, T, X, stress) to variable degree. Using available sample material from Austroalpine basement units in the Eastern Alps, we intend to compare inclusion-domains that behaved as essentially closed systems with those which were open for material exchange with the matrix. Special focus will be placed on the interrelation of mineral reactions, chemical mass transport and deformation. Constraining the influence of structural heterogeneities such as microfractures, (sub)grain boundaries and phase boundaries on material rheology, microstructure development and mineral reactions is supposed to yield new information on the behaviour of complex reactive systems under tectonic load. The intended research relies on the characterization of microstructures, textures and mineral compositions with an emphasis on high resolution analytical techniques (electron microprobe analysis, scanning electron microscopy, electron backscatter diffraction, cathodoluminescence, dual focused ion beam technique). These methods will be applied to host/inclusion boundaries, host internal reaction fronts and potential passageways for material transport in strained and unstrained host domains. State of the art material characterization will provide the basis for thermodynamic modelling of phase equilibria, diffusion modelling and mechanical modelling in order to identify and quantify the controlling parameters during metamorphism and their interplay.

利用颗粒内部的链反应研究控制变质岩再平衡过程的参数。我们专注于矿物主机/夹杂物的安排，这是受再平衡在不断变化的环境条件（P，T，X，应力）的可变程度。使用现有的样品材料从Austroalpine基底单位在东部阿尔卑斯山，我们打算比较包含域的行为基本上是封闭的系统与那些开放的材料交换与矩阵。将特别关注矿物反应，化学物质传输和变形的相互关系。约束的结构不均匀性，如微裂缝，（子）晶界和相界对材料流变学，微观结构的发展和矿物反应的影响，应该产生新的信息构造载荷下的复杂反应系统的行为。预定的研究依赖于微观结构、结构和矿物成分的特性，重点是高分辨率分析技术（电子探针分析、扫描电子显微镜、电子背散射衍射、阴极发光、双聚焦离子束技术）。这些方法将被应用到主机/夹杂物边界，主机内部的反应前线和潜在的通道，在应变和非应变主机域的材料传输。最先进的材料表征将为相平衡的热力学建模、扩散建模和力学建模提供基础，以确定和量化变质过程中的控制参数及其相互作用。