Microstructure of calcite in the CM2 carbonaceous chondrite LON 94101: Implications for deformation history during and/or after aqueous alteration

Lindgren, Paula and Lee, Martin R. and Sofe, Mahmood and Burchell, Mark J. (2011) Microstructure of calcite in the CM2 carbonaceous chondrite LON 94101: Implications for deformation history during and/or after aqueous alteration. Earth and Planetary Science Letters, 306 (3-4). pp. 289-298. ISSN 0012-821X. (doi:https://doi.org/10.1016/j.epsl.2011.04.022) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1016/j.epsl.2011.04.022

Abstract

The microstructure of calcite in the CM2 carbonaceous chondrite LON 94101 has been characterized using electron backscatter diffraction (EBSD) analysis, to reconstruct the parent body deformation history during and/or after aqueous alteration. The results suggest that at least two events of calcite crystallization have taken place during aqueous alteration, and at least three episodes of deformation are recorded by the calcite. The first event of calcite crystallization produced calcite grains scattered throughout the matrix, and the second event formed a calcite vein via localized fluid flow. The first episode of deformation is recorded in the crystallographic preferred orientations of the calcite grains and occurred via a directed stress probably induced by compaction in shallow crustal levels of the parent body. The second episode of deformation is recorded in an e-twin microstructure and it suggests a deformation induced via directed stress by impact processing, also in shallow crustal levels. The third episode of deformation generated subgrains in the calcite vein and in some calcite grains, and fragmented and disrupted the calcite vein. This could have been a result of a relatively forceful deformation event, perhaps when the meteorite was released from its parent body. This study shows that carbonate microstructures in carbonaceous chondrites is a powerful and versatile tool for reconstructing the history of deformation during and/or after aqueous alteration.

Item Type: Article
Uncontrolled keywords: carbonaceous chondrites; calcite; microstructures; e-twinning; EBSD
Subjects: Q Science > QB Astronomy
Q Science > QE Geology > QE515 Geochemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Mark Burchell
Date Deposited: 05 Dec 2013 13:13 UTC
Last Modified: 05 Jan 2015 13:32 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/37216 (The current URI for this page, for reference purposes)
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