Cargando…
Discovery of natural MgSiO(3) tetragonal garnet in a shocked chondritic meteorite
MgSiO(3) tetragonal garnet, which is the last of the missing phases of experimentally predicted high-pressure polymorphs of pyroxene, has been discovered in a shocked meteorite. The garnet is formed from low-Ca pyroxene in the host rock through a solid-state transformation at 17 to 20 GPa and 1900°...
Autores principales: | , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2016
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4820389/ https://www.ncbi.nlm.nih.gov/pubmed/27051873 http://dx.doi.org/10.1126/sciadv.1501725 |
_version_ | 1782425392550772736 |
---|---|
author | Tomioka, Naotaka Miyahara, Masaaki Ito, Motoo |
author_facet | Tomioka, Naotaka Miyahara, Masaaki Ito, Motoo |
author_sort | Tomioka, Naotaka |
collection | PubMed |
description | MgSiO(3) tetragonal garnet, which is the last of the missing phases of experimentally predicted high-pressure polymorphs of pyroxene, has been discovered in a shocked meteorite. The garnet is formed from low-Ca pyroxene in the host rock through a solid-state transformation at 17 to 20 GPa and 1900° to 2000°C. On the basis of the degree of cation ordering in its crystal structure, which can be deduced from electron diffraction intensities, the cooling rate of the shock-induced melt veins from ~2000°C was estimated to be higher than 10(3)°C/s. This cooling rate sets the upper bound for the shock-temperature increase in the bulk meteorite at ~900°C. |
format | Online Article Text |
id | pubmed-4820389 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-48203892016-04-05 Discovery of natural MgSiO(3) tetragonal garnet in a shocked chondritic meteorite Tomioka, Naotaka Miyahara, Masaaki Ito, Motoo Sci Adv Research Articles MgSiO(3) tetragonal garnet, which is the last of the missing phases of experimentally predicted high-pressure polymorphs of pyroxene, has been discovered in a shocked meteorite. The garnet is formed from low-Ca pyroxene in the host rock through a solid-state transformation at 17 to 20 GPa and 1900° to 2000°C. On the basis of the degree of cation ordering in its crystal structure, which can be deduced from electron diffraction intensities, the cooling rate of the shock-induced melt veins from ~2000°C was estimated to be higher than 10(3)°C/s. This cooling rate sets the upper bound for the shock-temperature increase in the bulk meteorite at ~900°C. American Association for the Advancement of Science 2016-03-25 /pmc/articles/PMC4820389/ /pubmed/27051873 http://dx.doi.org/10.1126/sciadv.1501725 Text en Copyright © 2016, The Authors http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Tomioka, Naotaka Miyahara, Masaaki Ito, Motoo Discovery of natural MgSiO(3) tetragonal garnet in a shocked chondritic meteorite |
title | Discovery of natural MgSiO(3) tetragonal garnet in a shocked chondritic meteorite |
title_full | Discovery of natural MgSiO(3) tetragonal garnet in a shocked chondritic meteorite |
title_fullStr | Discovery of natural MgSiO(3) tetragonal garnet in a shocked chondritic meteorite |
title_full_unstemmed | Discovery of natural MgSiO(3) tetragonal garnet in a shocked chondritic meteorite |
title_short | Discovery of natural MgSiO(3) tetragonal garnet in a shocked chondritic meteorite |
title_sort | discovery of natural mgsio(3) tetragonal garnet in a shocked chondritic meteorite |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4820389/ https://www.ncbi.nlm.nih.gov/pubmed/27051873 http://dx.doi.org/10.1126/sciadv.1501725 |
work_keys_str_mv | AT tomiokanaotaka discoveryofnaturalmgsio3tetragonalgarnetinashockedchondriticmeteorite AT miyaharamasaaki discoveryofnaturalmgsio3tetragonalgarnetinashockedchondriticmeteorite AT itomotoo discoveryofnaturalmgsio3tetragonalgarnetinashockedchondriticmeteorite |