Crystal bending, subgrain boundary development, and recrystallization in orthopyroxene during granulite-facies deformation

On abnormal subgrain growth and the origin of recrystallization nuclei

Abnormal subgrain growth has been proposed as the nucleation mechanism for recrystallization. To test this hypothesis, Monte Carlo Potts model simulations of subgrain growth were performed on single-phase, strain-free subgrain structures with experimentally validated microstructure, texture, boundary character, and boundary properties. Results indicate that abnormal growth events emerge spontan...

Thermal perturbation during charnockitization and granulite facies metamorphism in southern India

We have deduced the steady-state lithospheric geotherm at c. 1 Ga in the south Indian shield area using the available data on the concentration of radioactive elements, and the f-T conditions of Proterozoic mantle xenoliths in the south Indian kimberlites as constraints. The geotherm was adjusted back to 2.5 Ga by keeping the surface temperature constant and calculating the temperature change a...

Boundary migration during recrystallization: experimental observations

Quantitative analysis of boundary migration during recrystallization is a key task to understand the recrystallization process and to improve recrystallization models. In the last 2530 years, quantification of boundary migration has mostly been conducted in term of average growth rates in many materials. This type of analysis has largely been based on the assumption that all or groups of recrys...

Deformation and Recrystallization Behaviors in Magnesium Alloys

Synthesis and crystal structure of Li0.52Mg0.96Sc0.52Si2O6 orthopyroxene

Li0.52Mg0.96Sc0.52Si2O6 orthopyroxene was synthesized by the ß ux method and its structure studied with single-crystal X-ray diffraction. The crystal is orthorhombic with space group Pbca and unit-cell parameters a = 18.259(5), b = 8.883(2), c = 5.271(1) Å, and V = 854.9(3) Å. The structure reÞ nement shows that the M1 and M2 sites are occupied by (0.48 Mg + 0.52 Sc) and (0.48 Mg + 0.52 Li), re...