A grain boundary model of metamorphic reaction

A grain boundary model of metamorphic reaction
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变质反应的晶界模型

DOI:
10.1007/s00410-024-02100-9
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发表时间:
2024
影响因子:
3.5
通讯作者:
Spear, Frank S.
Spear, Frank S.
中科院分区:
地球科学1区
文献类型:
--
作者:
Spear, Frank S.

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提出了一种模型,其中变质共生体是由本地,纳米尺度的反应相邻的相位之间的沿着晶界驱动的固相和晶界组合物之间的局部不平衡。这些反应改变了晶界组成,建立了驱动扩散的组成梯度,并改变了岩石中其他地方的晶界组成,这驱动了这些位置的局部反应。该过程可能是由一个新的阶段,这是不平衡与现有的组合和一个例子的基础上的蓝晶石(Ky)的硅线石(Sil)的转变的成核触发。模型结果表明,一个简单的多晶型转变(Ky→Sil)可以导致岩石中所有相之间的局部反应,一些相可以在一个地方生长,并在另一个地方消耗。这些结果的一个含义是,解释变质共生的基础上增长或吸收和成分变化的阶段,需要仔细评估纳米尺度的过程。
A model is presented whereby metamorphic parageneses are governed by local, nano-scale reactions among adjacent phases along grain boundaries that are driven by local disequilibrium between the solid phases and the grain boundary composition. These reactions modify the grain boundary composition setting up compositional gradients that drive diffusion and change the grain boundary composition elsewhere in the rock, which drive local reactions in these locations. The process may be triggered by the nucleation of a new phase that is out of equilibrium with the existing assemblage and an example is presented based on the transformation of kyanite (Ky) to sillimanite (Sil). Model results reveal that a simple polymorphic transformation (Ky→Sil) can result in local reactions among all phases in the rock and some phases may grow in one locale and be consumed in another. An implication of these results is that interpretation of metamorphic parageneses based on growth or resorption and compositional changes of phases requires careful evaluation of nano-scale processes.
DOI: --
发表时间: 2014
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