Details
| Original language | English |
|---|---|
| Pages (from-to) | 33-40 |
| Number of pages | 8 |
| Journal | Geochimica et cosmochimica acta |
| Volume | 116 |
| Publication status | Published - 1 Sept 2013 |
| Externally published | Yes |
Abstract
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 <10-20μm allowed for only local aqueous alteration processes on the meteorite parent bodies.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Geochimica et cosmochimica acta, Vol. 116, 01.09.2013, p. 33-40.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Visualisation and quantification of CV chondrite petrography using micro-tomography
AU - Hezel, Dominik C.
AU - Elangovan, Premkumar
AU - Viehmann, Sebastian
AU - Howard, Lauren
AU - Abel, Richard L.
AU - Armstrong, Robin
PY - 2013/9/1
Y1 - 2013/9/1
N2 - 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 <10-20μm allowed for only local aqueous alteration processes on the meteorite parent bodies.
AB - 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 <10-20μm allowed for only local aqueous alteration processes on the meteorite parent bodies.
UR - http://www.scopus.com/inward/record.url?scp=84880617093&partnerID=8YFLogxK
U2 - 10.1016/j.gca.2012.03.015
DO - 10.1016/j.gca.2012.03.015
M3 - Article
AN - SCOPUS:84880617093
VL - 116
SP - 33
EP - 40
JO - Geochimica et cosmochimica acta
JF - Geochimica et cosmochimica acta
SN - 0016-7037
ER -