We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
The origin of alteration 'orangettes' in Dhofar 019: Implications for the age and aqueous history of the shergottites.
- Authors
Hallis, L. J.; Kemppinen, L.; Lee, M. R.; Taylor, L. A.
- Abstract
The shergottites are the largest group of Martian meteorites, and the only group that has not been found to contain definitive evidence of Martian aqueous alteration. Given recent reports of current liquid water at the surface of Mars, this study aimed to investigate in detail the possibility of Martian phyllosilicate within shergottite Dhofar 019. Optical and scanning electron microscopy, followed by transmission electron microscopy, confirmed the presence of alteration orangettes, with a layered structure consisting of poorly ordered Mg-phyllosilicate and calcite. These investigations identified maskelynite dissolution, followed by Mg-phyllosilicate and calcite deposition within the dissolution pits, as the method of orangette production. The presence of celestine within the orangette layers, the absence of shock dislocation features within calcite, and the Mg-rich nature of the phyllosilicate, all indicate a terrestrial origin for these features on Dhofar 019.
- Subjects
METEORITES; SCANNING electron microscopy; TRANSMISSION electron microscopy; PHYLLOSILICATES; GEOCHEMISTRY
- Publication
Meteoritics & Planetary Science, 2017, Vol 52, Issue 12, p2695
- ISSN
1086-9379
- Publication type
Article
- DOI
10.1111/maps.12987