Khác biệt giữa bản sửa đổi của “Mylonit”

Có nhiều cơ chế khác nhau để giải thích cho sự biến dạng dẻo tinh thể. In crustal rocks the most important processes are [[creep (deformation)|dislocation creep]] and [[diffusion creep]]. Dislocation generation acts to increase the internal energy of crystals. This effect is compensated through grain-boundary-migration recrystallization which reduces the internal energy by increasing the grain boundary area and reducing the grain volume, storing energy at the mineral grain surface. Quá trình này có khuynh hướng sắp xếp lại vào vị trí ranh giới hạt. Khi có nhiều hạt được xen vào các ranh giới hạt, the misorientation across that subgrain boundary will increase until the boundary becomes a [[grain boundary|high-angle boundary]] and the subgrain effectively becomes a new grain. This process, sometimes referred to as [[subgrain rotation recrystallization]],<ref>Dynamic recrystallization of minerals J. L. Urai, W. D. Means & G. S. Lister http://www.ged.rwth-aachen.de/Ww/projects/rexx/Urai+86Recrystallization/Urai+86Recrystallization5.htm</ref> acts to reduce the mean grain size. Volume and grain-boundary diffusion, the critical mechanisms in diffusion creep, become important at high temperatures and small grain sizes. Thus some researchers have argued that as mylonites are formed by dislocation creep and dynamic recrystallization, a transition to diffusion creep can occur once the grain size is reduced sufficiently.--->

 

 

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