Petrographic and geochemical evidence for multiphase formation of carbonates in the Martian orthopyroxenite Allan Hills 84001
Moyano-Cambero, Carles Eduard (Institut de Ciències de l'Espai)
Trigo Rodríguez, Josep Maria (Institut de Ciències de l'Espai)
Benito, M. Isabel (Universidad Complutense de Madrid. Departamento de Geodinámica, Estratigrafía y Paleontología)
Alonso-Azcárate, Jacinto (Universidad de Castilla-La Mancha. Facultad de Ciencias Ambientales y Bioquímica)
Lee, Martin R. (University of Glasgow. School of Geographical and Earth Sciences)
Mestres, Narcís (Institut de Ciència de Materials de Barcelona)
Martínez-Jiménez, Marina (Institut de Ciències de l'Espai)
Martín-Torres, Francisco J. (Instituto Andaluz de Ciencias de la Tierra)
Fraxedas, Jordi (Institut Català de Nanociència i Nanotecnologia)

Date:	2017
Abstract:	Martian meteorites can provide valuable information about past environmental conditions on Mars. Allan Hills 84001 formed more than 4 Gyr ago, and owing to its age and long exposure to the Martian environment, and this meteorite has features that may record early processes. These features include a highly fractured texture, gases trapped during one or more impact events or during formation of the rock, and spherical Fe-Mg-Ca carbonates. In this study, we have concentrated on providing new insights into the context of these carbonates using a range of techniques to explore whether they record multiple precipitation and shock events. The petrographic features and compositional properties of these carbonates indicate that at least two pulses of Mg- and Fe-rich solutions saturated the rock. Those two generations of carbonates can be distinguished by a very sharp change in compositions, from being rich in Mg and poor in Fe and Mn, to being poor in Mg and rich in Fe and Mn. Between these two generations of carbonate is evidence for fracturing and local corrosion.
Grants:	Ministerio de Ciencia e Innovación AYA2011-26522 Ministerio de Ciencia e Innovación AYA 2015-67175-P Ministerio de Ciencia e Innovación CTQ2015-62,635-ERC Ministerio de Ciencia e Innovación CTQ2014-60,119-P Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad SEV-2015-0496
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Meteoritics and Planetary Science, Vol. 52, issue 6 (June 2017) , p. 1030-1047, ISSN 1086-9379

DOI: 10.1111/maps.12851

18 p, 2.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles