Nihon Kessho Gakkaishi
Online ISSN : 1884-5576
Print ISSN : 0369-4585
Part 1. Microtexture in Minerals and Crystallography
Order-Disorder Transition in Majorite Garnet in Shocked Meteorites and Deep Earth's Interior
Naotaka TOMIOKA
Author information
JOURNALS FREE ACCESS

Volume 60 (2018) Issue 1 Pages 2-8

Details
Download PDF (1249K) Contact us
Abstract

Microstructures and symmetries of synthetic and natural(Mg, Fe)SiO3 garnet(majorite)have been investigated by transmission electron microscopy. Modulated and twin structures commonly observed in the synthetic majorite suggest a cubic-tetragonal phase transition due to cation ordering in its octahedral sites during quenching. Natural tetragonal majorite, which was newly discovered in a shock meteorite, has less-ordered octahedral cations than those in the synthetic samples. The order-disorder state of majorite provides important constraints not only on shock metamorphism of meteorites, but also on the deep Earth's mineralogy.

Information related to the author
© 2018 The Crystallographic Society of Japan
Previous article Next article

Recently visited articles
Predecessor

X-RAYS

feedback
Top