Griffin, S. , Daly, L. , Piazolo, S., Forman, L.V., Cohen, B.E., Lee, M.R. , Trimby, P.W., Baumgartner, R.J., Benedix, G.K. and Hoefnagels, B. (2022) Can the magmatic conditions of the Martian nakhlites be discerned via investigation of clinopyroxene and olivine intra-crystalline misorientations? Journal of Geophysical Research: Planets, 127(6), e2021JE007082. (doi: 10.1029/2021JE007082)
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Abstract
Deformation is a near ubiquitous process that is observed within nearly all naturally forming rocks. Electron backscatter diffraction (EBSD) is a technique that enables slip-systems (a form of plastic deformation) to be inferred from intra-crystalline misorientations at a comparable scale to representative CPO analysis (≥300 crystals for the nakhlites). Extensive laboratory and studies on naturally occurring samples have identified preferential mantle condition extrinsic parameters for specific slip-system signatures within olivine and clinopyroxene. Intra-crystalline misorientation patterns for olivine and augite (high Ca-clinopyroxene) for 16 different Martian nakhlite meteorites (21 sections) were analysed and assessed against these known parameters. Investigation of high and low deformation regions within the nakhlites revealed a shift in intra-crystalline misorientation patterns for 10 of the 21 sections. Interpreted as both shock (high deformations) and emplacement (low deformation) signatures. The observed variations in deformation patterns for the two main regimes of deformation indicate heterogeneous sampling of the nakhlite ejecta crater. Our findings indicate that shock deformation is prevalent throughout the nakhlites, and that great care needs to be taken when interpreting intra-crystalline misorientations of crystals within apparent lower deformation regions.
| Item Type: | Articles |
|---|---|
| Additional Information: | This work was funded by the Science and Technology Facilities Council through grants ST/N000846/1 and ST/H002960/1 to M.R.L. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Lee, Professor Martin and Daly, Dr Luke and Griffin, Miss Sammy |
| Authors: | Griffin, S., Daly, L., Piazolo, S., Forman, L.V., Cohen, B.E., Lee, M.R., Trimby, P.W., Baumgartner, R.J., Benedix, G.K., and Hoefnagels, B. |
| College/School: | College of Science and Engineering > School of Geographical and Earth Sciences |
| Journal Name: | Journal of Geophysical Research: Planets |
| Publisher: | Wiley |
| ISSN: | 2169-9097 |
| ISSN (Online): | 2169-9100 |
| Published Online: | 05 April 2022 |
| Copyright Holders: | Copyright © 2022 The Authors |
| First Published: | First published in Journal of Geophysical Research: Planets 127(6): e2021JE007082 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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