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Visualisation and quantification of CV chondrite petrography using micro-tomography

Hezel, DC, Elangovan, P, Howard, L, Abel, RL, Armstrong, R and Viehmann, S (2012) Visualisation and quantification of CV chondrite petrography using micro-tomography Geochimica et Cosmochimica Acta.

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Micro-computed tomography is a non-destructive technique that allows the study of 3D meteorite petrography. The technique produces a unique and instructive visualisation of the meteorite for quantifying its components. We studied the overall petrography of the two CV chondrites Allende and Mokoia to constrain their formation histories. A set of movies and stereographic images detail the 3D petrography. Component modal abundances agree with previous reports and modal abundance differences between Allende and Mokoia support the chondrule-matrix complementarity and that chondrules and matrix formed from the same chemical reservoir. We identified two types of chondrules, a normal type and one where a normal type I or II chondrule is almost completely encapsulated by an opaque-rich layer. This layer was probably acquired during a late stage condensation process. The appearance of opaques in chondrules and matrix is different, not supporting a genetic relationships between these. Low abundances of compound chondrules (1.75 vol% in Allende and 2.50 vol% in Mokoia) indicate low chondrule densities and/or low relative component velocities in chondrule formation regions. Porosities on a scale <10-20 μm allowed for only local aqueous alteration processes on the meteorite parent bodies. © 2012 Elsevier Ltd.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Hezel, DC
Howard, L
Abel, RL
Armstrong, R
Viehmann, S
Date : 2012
DOI : 10.1016/j.gca.2012.03.015
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:25
Last Modified : 24 Jan 2020 22:13

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